Owners Manual

Thank you, and congratulations on your choice of BOSS AD-8 Acoustic Guitar Processor.
Before using this unit, carefully read the sections entitled:
USING THE UNIT SAFELY (page 23) and IMPORTANT NOTES (page 4).
These sections provide important information concerning the proper operation of the unit. Additionally, in
order to feel assured that you have gained a good grasp of every feature provided by your new unit, this
manual should be read in its entirety. The manual should be saved and kept on hand as a convenient
reference.

Main Features

Using Acoustic modeling, the unit converts the output from piezo pickups to the sound of a real
acoustic guitar, as captured by a high-quality mic.

COSM modeling recreates the important components of a variety of recording situations. Offered are
six world-famous acoustic guitars along with a number of top-quality condenser mics. Now you can
always obtain the best acoustic sound, whether performing live or recording in your home studio.

Built-in reverb, developed especially for use with acoustic guitars, lets you produce a wide range of
spatial sounds, from the natural airiness to concert hall reverberation.

Includes anti-feedback function that automatically suppresses howling.

Built-in tuner lets you tune up easily, is ready whenever needed. The output can also be muted with the
AD-8s pedal during tuning.

Memory function allows you to configure up to four groups of settings to suit the material being
played or the type of guitar you are using.

COSM (Composite Object Sound Modeling)

Composite Object Sound Modeling (COSM) is
Rolands innovative and powerful sound
modeling technology. COSM analyzes the
many factors that make up the original sound,
such as the electrical and physical
characteristics of the original, and then
produces a digital model that can reproduce the
same sound.
Copyright 2003 BOSS CORPORATION
All rights reserved. No part of this publication may
be reproduced in any form without the written
permission of BOSS CORPORATION.

USING THE UNIT SAFELY

The
symbol alerts the user to important instructions
or warnings.The specific meaning of the symbol is
determined by the design contained within the
triangle. In the case of the symbol at left, it is used for
general cautions, warnings, or alerts to danger.

Used for instructions intended to alert

the user to the risk of death or severe
injury should the unit be used
improperly.
Used for instructions intended to alert
the user to the risk of injury or material
damage should the unit be used
improperly.
* Material damage refers
other adverse effects
respect to the home
furnishings, as well
animals or pets.

001

The
symbol alerts the user to items that must never
be carried out (are forbidden). The specific thing that
must not be done is indicated by the design contained
within the circle. In the case of the symbol at left, it
means that the unit must never be disassembled.

to damage or
caused with
and all its
to domestic

Before using this unit, make sure to read the

instructions below, and the Owners Manual.

The symbol alerts the user to things that must be

carried out. The specific thing that must be done is
indicated by the design contained within the circle. In
the case of the symbol at left, it means that the powercord plug must be unplugged from the outlet.

009

................................................................................................
002c

Do not open (or modify in any way) the unit or its

AC adaptor.

................................................................................................
003

................................................................................................
010

Do not attempt to repair the unit, or replace parts

within it (except when this manual provides
specific instructions directing you to do so). Refer
all servicing to your retailer, the nearest Roland
Service Center, or an authorized Roland
distributor, as listed on the Information sheet.

................................................................................................
004

Never use or store the unit in places that are:

Subject to temperature extremes (e.g., direct
sunlight in an enclosed vehicle, near a heating
duct, on top of heat-generating equipment); or
are
Damp (e.g., baths, washrooms, on wet floors); or
are
Humid; or are
Exposed to rain; or are
Dusty; or are
Subject to high levels of vibration.

................................................................................................
007

Make sure you always have the unit placed so it is

level and sure to remain stable. Never place it on
stands that could wobble, or on inclined surfaces.

................................................................................................
008b

Use only the specified AC adaptor (PSA series),

and make sure the line voltage at the installation
matches the input voltage specified on the AC
adaptors body. Other AC adaptors may use a
different polarity, or be designed for a different
voltage, so their use could result in damage,
malfunction, or electric shock.

................................................................................................

Do not excessively twist or bend the power cord,

nor place heavy objects on it. Doing so can damage
the cord, producing severed elements and short
circuits. Damaged cords are fire and shock
hazards!

This unit, either alone or in combination with an

amplifier and headphones or speakers, may be
capable of producing sound levels that could cause
permanent hearing loss. Do not operate for a long
period of time at a high volume level, or at a level
that is uncomfortable. If you experience any
hearing loss or ringing in the ears, you should
immediately stop using the unit, and consult an
audiologist.

................................................................................................
011

Do not allow any objects (e.g., flammable material,

coins, pins); or liquids of any kind (water, soft
drinks, etc.) to penetrate the unit.

................................................................................................
012c

Immediately turn the power off, remove the AC

adaptor from the outlet, and request servicing by
your retailer, the nearest Roland Service Center, or
an authorized Roland distributor, as listed on the
Information sheet when:
The AC adaptor or the power-supply cord has
been damaged; or
If smoke or unusual odor occurs
Objects have fallen into, or liquid has been spilled onto
the unit; or
The unit has been exposed to rain (or otherwise has
become wet); or
The unit does not appear to operate normally or
exhibits a marked change in performance.

................................................................................................

013

In households with small children, an adult should

provide supervision until the child is capable of
following all the rules essential for the safe
operation of the unit.

................................................................................................
014

Protect the unit from strong impact.

(Do not drop it!)

................................................................................................
015

Do not force the units power-supply cord to share

an outlet with an unreasonable number of other
devices. Be especially careful when using extension
cordsthe total power used by all devices you
have connected to the extension cords outlet must
never exceed the power rating (watts/amperes) for
the extension cord. Excessive loads can cause the
insulation on the cord to heat up and eventually
melt through.

106

................................................................................................
107d

Before using the unit in a foreign country, consult

with your retailer, the nearest Roland Service
Center, or an authorized Roland distributor, as
listed on the Information sheet.

................................................................................................
019

................................................................................................

The unit and the AC adaptor should be located so

their location or position does not interfere with
their proper ventilation.

................................................................................................
102d

Always grasp only the output plug or the body of

the AC adaptor when plugging into, or
unplugging from, this unit or an outlet.

................................................................................................
103b

At regular intervals, you should unplug the AC

adaptor and clean it by using a dry cloth to wipe
all dust and other accumulations away from its
prongs. Also, disconnect the power plug from the
power outlet whenever the unit is to remain
unused for an extended period of time. Any
accumulation of dust between the power plug and
the power outlet can result in poor insulation and
lead to fire.

Whenever you suspect the possibility of lightning

in your area, disconnect the AC adaptor from the
outlet.

111: Selection

Before cleaning the unit, turn off the power and

unplug the AC adaptor from the outlet.

................................................................................................
110b

101b

Before moving the unit, disconnect the AC adaptor

and all cords coming from external devices.

................................................................................................
109b

Batteries must never be recharged, heated, taken

apart, or thrown into fire or water.

................................................................................................

Never handle the AC adaptor body, or its output

plugs, with wet hands when plugging into, or
unplugging from, an outlet or this unit.

................................................................................................
108b

................................................................................................
016

Never climb on top of, nor place heavy objects on

the unit.

If used improperly, batteries may explode or leak

and cause damage or injury. In the interest of
safety, please read and observe the following
precautions (p. 5).
Carefully follow the installation instructions for
batteries, and make sure you observe the correct
polarity.
Avoid using new batteries together with used
ones. In addition, avoid mixing different types
of batteries.
Remove the batteries whenever the unit is to
remain unused for an extended period of time.
If a battery has leaked, use a soft piece of cloth
or paper towel to wipe all remnants of the
discharge from the battery compartment. Then
install new batteries. To avoid inflammation of
the skin, make sure that none of the battery
discharge gets onto your hands or skin. Exercise
the utmost caution so that none of the discharge
gets near your eyes. Immediately rinse the
affected area with running water if any of the
discharge has entered the eyes.
Never keep batteries together with metallic
objects such as ballpoint pens, necklaces,
hairpins, etc.

................................................................................................
112

Used batteries must be disposed of in compliance

with whatever regulations for their safe disposal
that may be observed in the region in which you
live.

................................................................................................

................................................................................................
104

Try to prevent cords and cables from becoming

entangled. Also, all cords and cables should be
placed so they are out of the reach of children.

................................................................................................

IMPORTANT NOTES
291a

In addition to the items listed under USING THE UNIT SAFELY on page 23, please read and observe the
following:

Power Supply: Use of Batteries

301

Do not use this unit on the same power circuit with any
device that will generate line noise (such as an electric
motor or variable lighting system).
302

The AC adaptor will begin to generate heat after long

hours of consecutive use. This is normal, and is not a cause
for concern.
303a

The use of an AC adaptor is recommended as the units

power consumption is relatively high. Should you prefer to
use batteries, please use the alkaline type.
304b

Batteries should always be installed or replaced before

connecting any other devices. This way, you can prevent
malfunction and/or damage to speakers or other devices.
306b

Batteries are supplied with the unit. The life of these

batteries may be limited, however, since their primary
purpose was to enable testing.
307

Before connecting this unit to other devices, turn off the

power to all units. This will help prevent malfunctions
and/or damage to speakers or other devices.

Placement
351

Using the unit near power amplifiers (or other equipment

containing large power transformers) may induce hum. To
alleviate the problem, change the orientation of this unit; or
move it farther away from the source of interference.
352a

This device may interfere with radio and television

reception. Do not use this device in the vicinity of such
receivers.
352b

Noise may be produced if wireless communications

devices, such as cell phones, are operated in the vicinity of
this unit. Such noise could occur when receiving or initiating a call, or while conversing. Should you experience
such problems, you should relocate such wireless devices
so they are at a greater distance from this unit, or switch
them off.
355b

When moved from one location to another where the

temperature and/or humidity is very different, water
droplets (condensation) may form inside the unit. Damage
or malfunction may result if you attempt to use the unit in
this condition. Therefore, before using the unit, you must
allow it to stand for several hours, until the condensation
has completely evaporated.

Maintenance
401a

For everyday cleaning wipe the unit with a soft, dry cloth
or one that has been slightly dampened with water. To
remove stubborn dirt, use a cloth impregnated with a mild,
non-abrasive detergent. Afterwards, be sure to wipe the
unit thoroughly with a soft, dry cloth.

402

Never use benzine, thinners, alcohol or solvents of any

kind, to avoid the possibility of discoloration and/or deformation.

Repairs and Data

452

Please be aware that all data contained in the units

memory may be lost when the unit is sent for repairs.
Important data should always be written down on paper,
Setting Memo. During repairs, due care is taken to avoid
the loss of data. However, in certain cases (such as when
circuitry related to memory itself is out of order), we regret
that it may not be possible to restore the data, and Roland
assumes no liability concerning such loss of data.

Additional Precautions
551

Please be aware that the contents of memory can be

irretrievably lost as a result of a malfunction, or the
improper operation of the unit. To protect yourself against
the risk of loosing important data, we recommend that you
periodically save a backup copy of important data you
have stored in the units memory written down on paper,
Setting Memo.
552

Unfortunately, it may be impossible to restore the contents

of data that was stored in the units memory once it has
been lost. Roland Corporation assumes no liability
concerning such loss of data.
553

Use a reasonable amount of care when using the units

buttons, sliders, or other controls; and when using its jacks
and connectors. Rough handling can lead to malfunctions.
554

Never strike or apply strong pressure to the display.

556

When connecting / disconnecting all cables, grasp the

connector itselfnever pull on the cable. This way you will
avoid causing shorts, or damage to the cables internal
elements.
558a

To avoid disturbing your neighbors, try to keep the units

volume at reasonable levels. You may prefer to use
headphones, so you do not need to be concerned about
those around you (especially when it is late at night).
559a

When you need to transport the unit, package it in the box

(including padding) that it came in, if possible. Otherwise,
you will need to use equivalent packaging materials.
562

Use a cable from Roland to make the connection. If using

some other make of connection cable, please note the
following precautions.
Some connection cables contain resistors. Do not use
cables that incorporate resistors for connecting to this
unit. The use of such cables can cause the sound level to
be extremely low, or impossible to hear. For information on cable specifications, contact the manufacturer of the cable.

Installing Batteries
*

Batteries are supplied with the unit. The life of these batteries
may be limited, however, since their primary purpose was to
enable testing.

Insert the included batteries as shown in figure, being careful

to orient the batteries correctly.
fig.01-01

Contents
USING THE UNIT SAFELY................. 2
IMPORTANT NOTES ........................ 4
Installing Batteries ......................... 5
Connections ................................... 6
Connecting to Mixers ....................................................6
Mono Connection......................................................6
Stereo Connection .....................................................7
Connecting to Acoustic Guitar Amps
or Multitrack Recorders ................................................7
Mono Connection......................................................7
Stereo Connection .....................................................8
Connecting to Electric Guitar Amps...........................8
Mono Connection......................................................8

Part Names and Functions ............. 9

Front Panel.......................................................................9
BODY TYPE List......................................................10
Rear Panel ......................................................................13

Operation.................................... 14

When turning the unit upside-down, get a bunch of

newspapers or magazines, and place them under the
four corners or at both ends to prevent damage to the
buttons and controls. Also, you should try to orient the
unit so no buttons or controls get damaged.
When turning the unit upside-down, handle with care to
avoid dropping it, or allowing it to fall or tip over.
Make sure the + and - ends of the batteries are
oriented correctly.
When the batteries run down, the POWER indicator gets
dim. If this happens, replace with new batteries.
When replacing the batteries, use six AA type.
Avoid using new batteries together with used ones. In
addition, avoid mixing different types of batteries.
Doing so can result in fluid leakage.
Battery life can vary depending on battery type.

ON/OFF Pedal Operation ...........................................14

MEMORY t/s Pedal Functions ...................................14
Panel Operation ............................................................15
Storing Settings (Write Operation)...........................16
Storing the MANUAL Sound in Memory .......16
Changing and Storing the MEMORY Sound ......16

Setting the Function Used When the

Effects Are Off (Bypass/Mute) ........... 17
Changing How Memory Numbers
Are Indicated ................................. 17
How to Use the Tuner .................. 18
How to Tune Your Instrument ..................................18
Changing the Reference Pitch (PITCH) ...................18

How to Use the ANTI-FEEDBACK ... 19

Returning Settings
to Their Factory Defaults .............. 20
Troubleshooting........................... 21

Continuous usage time under battery power is about 23

hours with alkaline batteries and about 9 hours with
carbon batteries. (This may vary according to usage
conditions.)

Sample Settings ........................... 22

Setting Memo .............................. 23
Specifications............................... 25

Installing Batteries

Connections
To prevent malfunction and/or damage to speakers or other
devices, always turn down the volume, and turn off the power
on all devices before making any connections.

The pin assignment for the XLR type connectors is as shown

below. Before making any connections, make sure that this pin
assignment is compatible with that of all your other devices.

fig.02-01

Rise the amp volume only after turning on the power to all
connected devices.

To prevent the inadvertent disruption of power to your unit

(should the plug be pulled out accidentally), and to avoid
applying undue stress to the AC adaptor jack, anchor the power
cord using the cord hook, as shown in the illustration.

fig.02-02

The power comes on when you insert the connector plug into
the INPUT jack.

Once the connections have been completed, turn on power to

your various devices in the order specified. By turning on
devices in the wrong order, you risk causing malfunction and/
or damage to speakers and other devices.
When powering up:
Turn on the power to your guitar amp last.
When powering down:
Turn off the power to your guitar amp first.

Always make sure to have the volume level turned down before
switching on power. Even with the volume all the way down,
you may still hear some sound when the power is switched on,
but this is normal, and does not indicate a malfunction.

Connecting to Mixers
Mono Connection
fig.02-06

Acoustic Guitar
(Piezo Pickup)
Stereo Headphones

AC Adaptor
(PSA series)

* The same sounds are output

from A and B when mono
output is used.

Mixer

Connections

Stereo Connection
fig.02-07

Acoustic Guitar
(Piezo Pickup)
Stereo Headphones

AC Adaptor
(PSA series)

Mixer

Connecting to Acoustic Guitar Amps or Multitrack Recorders

Mono Connection
fig.02-03

Acoustic Guitar
(Piezo Pickup)
Stereo Headphones

Recommended settings for the AC-60

AC Adaptor
(PSA series)

GUITAR CHANNEL

* The AC-60 is designed to produce optimal sound with an electric

acoustic guitar connected directly to the unit. You can produce the
best results when connecting to the AD-8 by setting the AC-60s
GUITAR CHANNEL as shown in the figure.

Acoustic Guitar Amp

(Roland AC-60 etc.)

MTR

Connections

Stereo Connection
fig.02-04

Acoustic Guitar
(Piezo Pickup)
Stereo Headphones

Recommended settings for the AC-60

GUITAR CHANNEL

AC Adaptor
(PSA series)

GUITAR CHANNEL

* The AC-60 is designed to produce optimal sound with an electric

acoustic guitar connected directly to the unit. You can produce the
best results when connecting to the AD-8 by setting the AC-60s
GUITAR CHANNEL as shown in the figure.

Acoustic Guitar Amp

(Roland AC-60 etc.)

MTR

Connecting to Electric Guitar Amps

Mono Connection
fig.02-05

Acoustic Guitar
(Piezo Pickup)
Stereo Headphones

Electric Guitar Amp

AC Adaptor
(PSA series)

Part Names and Functions

Front Panel
REVERB knob

EQULIZER

You can switch this knob to attain any of three

different reverb effects. The effect deepens as the
knob is turned to the right.

BASS knob

TREBLE knob

This adjusts the balance of the

lower range.

This adjusts the balance of the

upper range.

MIDDLE GAIN knob

PRESENCE knob

This adjusts the balance of the

midrange.

This adjusts the balance of the

frequencies that are even
higher than those adjusted
with the TREBLE knob.

No effects are applied with this is switched to OFF.

AMBIENCE:
This provides a sense of distance in the sound, like
that obtained with off-mic recording.
ROOM:
This provides reverb like that obtained in a
recording studio.
HALL:
This provides reverb like that obtained in a concert
hall.
*

Graduations for AMBIENCE, ROOM, and HALL

on a panel are for reference. Be sure to check the
sound as you adjust the effects.

MIDDLE FREQ
(frequency) knob
This specifies the frequency
band to be adjusted with the
MIDDLE GAIN knob. The
band can be specified within
the range from 200 Hz to 1.6
kHz.

STRING ENHANCE knob

OUTPUT LEVEL knob

Allows you to bring out more of the

pleasant overtones of the guitar strings.
Especially effective with finger picking.

This adjusts the output volume

level.
*

The OUTPUT LEVEL knob only

adjusts the volume pertaining to
times when the effects are on.
When the effects are switched off,
the volume remains at a fixed
level (bypass or mute).

POWER indicator
This is lit while the power is on.
*

When the batteries run down, this indicator gets

dim. If this happens, replace with new batteries.

BODY knob
BODY TYPE knob

This adjusts the sound the body puts out.

Select the setting that is closest to the straight,

unaffected sound of the guitar you are using.

The basic setting is with the knob at center position. Turning the
knob to the right (clockwise) produces a bigger body sound; turn
the knob to the left to achieve more of a piezo pickup tone quality.
*

BODY TYPE List (p. 10)

Increasing the BODY setting also raises the output level. If the sound
becomes distorted, lower the output volume level with the OUTPUT
LEVEL knob.

Part Names and Functions

BODY TYPE List

The AD-8 includes six settings that model the beautiful resonance of these guitars as captured by ideally matched microphones.
Guitar

Mic

Description

Martin D-28

Neumann
U87

Combination of the exquisite and balanced sound of this early-model Martin through
a Neumann U87, the standard in studio condenser mics.

Martin 000-28

Neumann
U67

Combines the sound of this guitar, with its solid low- and midrange resonance and
clear, distinct sound, with the U67 tube condenser mic.

Gibson J-45

Neumann
U67

Vintage model Gibson featuring a uniquely seasoned tone and characteristic responsiveness, matched with the U67 tube condenser mic.

Gibson B-25

Neumann
U87

Combination of this smaller-bodied vintage model, used often in Blues music, and a
U87, the standard in studio condenser mics.

GUILD D-40

AKG C12

Guitar featuring warm resonance from the body and delicate resonance from the
strings, combined with the C12 tube condenser mic.

Jose Ramirez

AKG C12

World-renowned classical guitar model combined with the C12 tube condenser mic.

10

The trademarks listed in this document are trademarks of their respective owners, which are separate companies from BOSS. Those
companies are not affiliated with BOSS and have not licensed or authorized BOSSs AD-8. Their marks are used solely to identify the
equipment whose sound is simulated by BOSSs AD-8.

Part Names and Functions

MEMORY
MANUAL indicator

WRITE button

This lights when MANUAL (p. 14) is selected.

Press this to store settings to MEMORY 14.

MEMORY Number indicators 14

This lights when MEMORY 14 (p. 14) is selected.

Storing Settings (Write Operation) (p. 16)

During the write operation, the indicator flashes during

write standby, flashing rapidly while data is being written.

SELECT button
Provides for selection among MANUAL and MEMORY 14.

You can change the way the numbers are indicated.

Changing How Memory Numbers Are Indicated (p. 17)

MEMORY Pedals (MEMORY /)

These perform two functions, selecting among MANUAL and MEMORY 14, and anti-feedback.

MEMORY / Pedal Functions (p. 14)

How to Use the ANTI-FEEDBACK (p. 19)

11

Part Names and Functions

TUNER
TUNER meter

PITCH button

This shows the difference between the note indicated in the

tuner display and the pitch of the sound being input while
the tuner is operating.

This sets the tuners reference pitch.

Changing the Reference Pitch (PITCH) (p. 18)

TUNER display
This indicates the note names when the tuner is operating.

BYPASS/MUTE button

How to Use the Tuner (p. 18)

This sets whether the AD-8 switches to Bypass or Mute

mode when the effects are switched off with the ON/OFF
pedal.

Settings values and other information is displayed here when

the tuner is not active.

Setting the Function Used When the Effects Are Off

(Bypass/Mute) (p. 17)

ON/OFF pedal
ON/OFF indicator
The effects are alternately switched on
and off each time this pedal is pressed.

ANTI-FEEDBACK indicator
Indicates the status of the anti-feedback function.
Flashing: Detection of feedback
frequencies in progress
Lit solidly: On

Unlit:

Off

The ON/OFF indicator lights when the

effects are on.
ON:
Sounds set using the AD-8 are output.
OFF:
Sounds are output exactly as input
(Bypass) or muted (Mute).

ON/OFF Pedal Operation (p. 14)

Setting the Function Used When the
Effects Are Off (Bypass/Mute) (p. 17)

How to Use the ANTI-FEEDBACK (p. 19)

12

Part Names and Functions

Rear Panel
INPUT jack

PHONES jack

Connect the output from your

acoustic guitar or effects
processor here.

You can connect headphones here to listen to the sounds.

*

Connect headphones only after turning on the power. Also be sure to disconnect the
headphones before turning off the power.

Connections (p. 6)
*

The AD-8 is switched on

when a plug is connected to
the INPUT jack. The power
is turned off when the plug
is disconnected from the
jack.
Be sure to disconnect any
plug from this jack
whenever the AD-8 is not
in use.

ELECTRIC GUITAR AMP OUTPUT jack

This jack is used for connecting to electric guitar amps.

Connecting to Electric Guitar Amps (p. 8)

UNBALANCED OUTPUT A (MONO)/B jacks

These jacks are used for connecting to acoustic guitar amps,
multitrack recorders, and other such equipment.
When using monaural signals, connect to the
UNBALANCED OUTPUT A (MONO) jack.

Connecting to Acoustic Guitar Amps or Multitrack

Recorders (p. 7)

Cord Hook
Wrap the cable around this hook
so that the AC adaptor cable is
not pulled out accidentally

Connections (p. 6).

BALANCED OUTPUT A/B jacks

Use these jacks to connect to a mixer.

Security slot (
Connecting to Mixers (p. 6)

http://www.kensington.com/

STEREO/MONO switch
This switches between stereo output (STEREO) and monaural
output (MONO). The same sounds are output from A and B
when mono output is used.

AC Adaptor jack

NOR/LIFT switch

This jack is used for connecting an optional AC

adaptor (the PSA series).

This disconnects the 1:GND pin from the inputs ground.

Switch this to LIFT if humming or other noise from ground
loops becomes a problem.
The AD-8 is normally used with this set to NOR.

Using the AC adaptor allows you to perform with

the AD-8 for extended periods without having to
worry about running out of battery power.

13

Operation
ON/OFF Pedal Operation
MEMORY / Pedal Functions

ON/OFF Pedal Operation

The ON/OFF pedal is set to ON when the power is
turned on.
This turns the AD-8s effects on and off.
The ON/OFF indicator lights up when the effect is on.
On: Lit

Off: Unlit

When the effects are switched off, the input sounds are
output as is (when set to the factory settings); the tuner is
also operational.

You can also mute the output when the effects are turned
off.

Setting the Function Used When the Effects Are Off

(Bypass/Mute) (p. 17)

MEMORY / Pedal Functions

These pedals allow you select among MANUAL mode and
MEMORY 14.
MANUAL:
The sound as determined by the settings of the panel's
knobs is output.
MEMORY:
Sounds conforming to pre-programmed settings are output.
Press the MEMORY pedal to switch through the
memories in the following sequence:
MANUAL MEMORY 1 MEMORY 2 MEMORY 3
MEMORY 4 MANUAL.

14

Press the MEMORY pedal to switch through the

memories in the following sequence:
MANUAL MEMORY 4 MEMORY 3 MEMORY 2
MEMORY 1 MANUAL.

You can also use the MEMORY / pedals when using the
anti-feedback function.

How to Use the ANTI-FEEDBACK (p. 19)

Operation

Panel Operation
So that you will be better able to follow along with the instructions in this document, first press the ON/OFF pedal so that the
effects are ON (ON/OFF indicator is lit), and set the SELECT button to MANUAL (MANUAL indicator is lit).
Also, all knobs should be set as shown in the illustration.
*

The AD-8 switches to MANUAL when the power is turned on.

fig.03-02

1. Use the BODY TYPE knob to select the sound that

most closely corresponds to the basic, original
sound of the guitar you are using.
2. Adjust the sound the body produces with the
BODY TYPE knob.
*

Turn this knob to the left (counterclockwise) to get a sound

close to that of a guitar's own sound.

3
5. Add reverberation with the REVERB knob.
You can switch the knob to attain any of three different
reverb effects. The effect deepens as the knob is turned to
the right (clockwise).
AMBIENCE:
This provides a sense of distance in the sound, like that
obtained with off-mic recording.

3. Turn the STRING ENHANCE knob if you want

to bring out more of the pleasant overtones of the
guitar strings.

ROOM:

4. Adjust the EQUALIZER knobs as necessary to

achieve the desired tone.

HALL:

BASS:
This adjusts the balance of the lower range.

This provides reverb like that obtained in a recording

studio.

This provides reverb like that obtained in a concert hall.

6. Adjust the volume with the OUTPUT LEVEL

knob.

MIDDLE GAIN:
This adjusts the balance of the midrange.
MIDDLE FREQ:
This specifies the frequency band to be adjusted with the
MIDDLE GAIN knob. The band can be specified within
the range from 200 Hz to 1.6 kHz.
TREBLE:
This adjusts the balance of the upper range.
PRESENCE:
This adjusts the balance of the frequencies that are even
higher than those adjusted with the TREBLE knob.

15

Operation

Storing Settings (Write Operation)

You can store up to four groupings of panel knob settings (MEMORY 14).
*

The anti-feedback effect settings can also be stored.

Storing the MANUAL Sound in

Memory

Changing and Storing the MEMORY

Sound

1. Create the sound you want using knobs.

1. Press the MEMORY / pedal or the SELECT

button to change to the MEMORY sound.

2. Press the WRITE button.

The MEMORY indicator and the indicator for the
currently selected memory flash, and the AD-8 is put into
write standby.

2. Operate the knobs to change the sound.

3. Press the WRITE button.
The MEMORY indicator and the indicator for the
currently selected memory number start to flash, and the
AD-8 is put into write standby.

fig.03-03

Write Standby
Flash

fig.03-06

Write Standby
Flash

3. Press the SELECT button to select the memory

(number) to which you want to store the sound.
The indicator for the selected memory number flashes.
fig.03-04

Flash

Write Standby
Flash

4. Press the SELECT button to select the memory

(number) to which you want to store the sound.
The indicator for the selected memory number flashes.
fig.03-07

Flash

Flash

4. Press the WRITE button.

The write operation is completed when the indicator for
the write-destination memory begin to flash more rapidly.

5. Press the WRITE button.

The write operation is completed when the indicator for
the write-destination memory begin to flash more rapidly.

Do not switch off the power while a write operation is in

progress.

Do not switch off the power while a write operation is in

progress.

fig.03-05

Flash

Writing
Flash rapidly

Write Finished

fig.03-08

Flash rapidly

16

To cancel the write operation, then before you press the WRITE
button, rotate the knob, press the BYPASS/MUTE button,
PITCH button, or operate the ON/OFF pedal.

Lit

If the knob or the pedal position is changed before the WRITE

button is pressed, the write operation is cancelled, and the AD8 is returned to the status in effect in Step 2 (when the
MEMORY sound has been changed).

Setting the Function Used

When the Effects Are Off
(Bypass/Mute)
You can choose whether the AD-8 switches to Bypass mode
or Mute mode when you switch the effects off with the ON/
OFF pedal.
*

This is set to switch to Bypass at the factory.

BYPASS:
Input sounds are output as is. Select this when you want to
use the guitar output without any changes in the sound.
fig.06-01a

Changing How Memory

Numbers Are Indicated

Not only can you confirm the currently selected memory

merely by checking the lit MEMORY number indicators, you
can also change the pattern in which the indicators light up.
Select the pattern that provides the easiest way to check the
memory in any particular environment.
*

This is set to Lighting Pattern 1 at the factory.

Lighting Pattern 1 (Normal):

Only the indicator for the selected memory lights up (or
flashes).
fig.06-02

Display
MANUAL

MUTE:
No sound is output. Select this setting when you want to
mute the sound while tuning.
fig.06-01b

Display

MEMORY 1

MEMORY 2

MEMORY 4

MEMORY 3

Lighting Pattern 2:
The number of indicators lighting up (or flashing)
corresponds to the selected memory number.
fig.06-03

MANUAL

MEMORY 1

MEMORY 2

MEMORY 4

MEMORY 3

1. Press the BYPASS/MUTE button.

The current settings are indicated in the TUNER display.
fig.06-01c

When using the AD-8 in dimly lit surroundings, you can

confirm memory numbers more easily by using the Lighting
Pattern 2 setting.

1. Hold down the SELECT button for at least two

seconds.
2. Hold down the BYPASS/MUTE button to switch
the settings.

The lighting pattern is switched.

fig.06-04

If nothing is altered during the next few moments, the

settings are stored, and the indication in the TUNER
display disappears.
*

The settings remain stored in memory even after the power is

turned off.
*

The settings remain stored in memory even after the power is

turned off.

17

How to Use the Tuner

The tuner is activated when the ON/OFF pedal is switched
to OFF (when the ON/OFF indicator is off).
Tune your instrument in this mode.

You can mute the output while the tuner is in operation.

fig.06-05a

On: Lit

Off: Unlit
Setting the Function Used When the Effects Are Off (Bypass/
Mute) (p. 17)

How to Tune Your Instrument

This specifies the frequency for the A note used as the

reference for tuning in performance (this is referred to as the
reference pitch). With the AD-8, you can set the reference
pitch to any frequency from 438 Hz to 445 Hz.

1. Play a single note on your guitar.

The name of the note closest to the note being input in
indicated in the TUNER display, and you can confirm
how far the pitch is off with the TUNER meter.
*

The lit dot in the display indicates sharp.

fig.06-05b

C#

D#

F#

G#

A#

Changing the Reference Pitch

(PITCH)

This is set to 440 Hz at the factory.

The settings remain stored in memory even after the power is

turned off.

1. Press the PITCH button.

2. Tune the guitar so that the note name for the open
string is indicated in the TUNER display.

The current reference pitch is indicated by the number in

the ones place in the TUNER display (e.g., 0 when set
to 400 Hz).
fig.06-07a

(Normal tuning)
6th
string
E

5th
string
A

4th
string
D

3rd
string
G

2nd
string
B

1st
string
E

3. Continue to tune the guitar until only the 0

indicator is lit in the TUNER meter.
2. Hold down the PITCH button.

fig.06-06

The reference pitch changes as follows.

fig.06-07b

438

439

440

441

445

Too High

Just Tuned
If nothing is altered during the next few moments, the
settings are stored, and the indication in TUNER display
disappears.
Too Low

18

How to Use the ANTI-FEEDBACK

Anti-feedback is a function that suppresses feedback that
occurs between the guitar and the amp. Feedback is
suppressed by cutting the volume in frequencies at which it
occurs.
The AD-8s anti-feedback function automatically detects the
frequencies at which feedback occurs, and automatically
attenuates the sounds at the detected frequencies, so feedback
is rapidly and accurately suppressed.

Before Using the Anti-Feedback

First, adjust the AD-8s output level, the distance between
the guitar and the amp and between the guitar and the
speakers, the direction the guitar is facing, and other
factors making it harder for feedback to occur.

To exit the anti-feedback function, hold down the

MEMORY pedal and MEMORY pedal for at least
two seconds.
*

The anti-feedback settings are not stored when in MANUAL

mode.

If you perform the Write operation while the ANTI-FEEDBACK

indicator is lit, the AD-8 stores the tone with the anti-feedback
applied.

Anti-feedback is always off (the ANTI-FEEDBACK indicator

is off) when the power is turned on.

When using the anti-feedback feature, you can suppress

feedback at one point.
If the feedback cannot be successfully suppressed using
the anti-feedback feature, you'll need to go back and
readjust your setup.

1. Simultaneously press the MEMORY pedal and

MEMORY pedal.
fig.06-08

The ANTI-FEEDBACK indicator flashes, and the

frequencies at which feedback occurs are automatically
detected.
*

Refrain from producing sound while the frequency at which

feedback occurred is being detected automatically.
Once detection is completed, the indicator stops flashing
and remains lit, and sounds at the detected frequencies as
well as at frequencies one octave higher are cut.

Anti-feedback is not applied when there is no input, or if no

feedback is detected at any frequency.

If you again hold down the MEMORY pedal and

MEMORY pedal together while the ANTI-FEEDBACK
indicator is lit, the anti-feedback is cancelled, and detection of
frequencies with feedback begins again.

19

Returning Settings to Their Factory Defaults

You can restore the following settings to their original factory
values.
MEMORY 1
MEMORY 2
MEMORY 3
MEMORY 4
Function when effects are off
(p. 17)
Memory number indication
(p. 17)
TUNER reference pitch
(p. 18)

Sample Setting 1 (p. 22)

Sample Setting 2 ( )
Sample Setting 3 ( )
Sample Setting 4 ( )
BYPASS
Lighting Pattern 1
440 Hz

Carrying out the following procedure completely clears the

content currently stored in the memories (14).

1. Switch off the power (disconnect the connection

plug from the INPUT jack).
2. While holding down the WRITE button, switch
on the power (insert the connection plug into the
INPUT jack).
A flashing F appears in the TUNER display.

3. Press the WRITE button.

After the TUNER display flashes more rapidly, the
factory settings are restored, and the AD-8 returns to
normal operation.
*

20

To cancel the setting change and the unit returns to its

ordinary state, then before you press the WRITE button,
operate the MEMORY / or ON/OFF pedal.

Troubleshooting
The power doesnt come on

Sound is distorted

Is the guitar connected correctly to the INPUT jack?

Check the connections again (p. 6p. 8).

Are the BODY, EQUALIZER, and OUTPUT LEVEL

knobs at suitable settings?

Increasing the BODY, EQUALIZER (BASS, MIDDLE

GAIN, TREBLE, PRESENCE), and OUTPUT LEVEL knob
settings also raises the volume level. In such instances,
turn the OUTPUT LEVEL knob to the left
(counterclockwise) to reduce the output level.

If distortion remains even after lowering the output

level with the OUTPUT LEVEL knob

Lower the output level of your guitar, effects processor,

or other such gear.

When running off batteries, the unit won't switch on unless

there's something plugged into the INPUT jack.

Have the batteries run down?

Replace with fresh batteries (p. 5).

If your guitar pickup system uses batteries, have these

batteries run down?

Refer to the owners manual for your pickup system for

instructions on replacing the batteries.

Is the specified AC adaptor (PSA-series sold separately)

connected correctly?

Check the connections again (p. 6p. 8).

When playing through a guitar amp, the

sound as heard through headphones is
almost completely different

Is the guitar connected to the ELECTRIC GUITAR AMP

OUTPUT jack?

Guitar amps have special characteristics suited especially

for electric guitars; when an acoustic guitar is used, the
low and high frequencies tend to be boosted.

There is no sound

Is the other equipment connected correctly?

Check the connections again (p. 6p. 8).

Is the volume turned down on the connected guitar/

bass amp, effects processor, or other device?

Check the settings on the connected equipment (p. 6p. 8).

Is the output level (OUTPUT LEVEL knob) set to

minimum?

Operate the OUTPUT LEVEL knob to adjust the effect

level (p. 9).

Have you put the AD-8 in Mute mode with the ON/OFF
pedal?

Press the ON/OFF pedal to switch this to ON (ON/

OFF indicator is lit). (p. 14)

When playing through a guitar amp, connect to the

ELECTRIC GUITAR AMP OUTPUT jack (p. 8, p. 13).

The volume level of the instrument

connected to INPUT jack is too low

Could you be using a connection cable that contains a

resistor?

Use a connection cable that does not contain a resistor.

21

Sample Settings
Chord Strumming . . . . . . . . . . . . . (MEMORY 1)

Finger Picking . . . . . . . . . . . . . . . (MEMORY 2)

Flat Picking . . . . . . . . . . . . . . . . . (MEMORY 3)

Blues . . . . . . . . . . . . . . . . . . . . . . (MEMORY 4)

22

Setting Memo

23

Setting Memo

24

Specifications
AD-8: Acoustic Guitar Processor

Indicators
POWER indicator (serves also as battery check indicator)

Nominal Input Level

-20 dBu

ANTI-FEEDBACK indicator
ON/OFF indicator
MANUAL indicator

Input Impedance
4.7 M

MEMORY Number indicator 14

TUNER meter
TUNER display

Nominal output Level

-20 dBu

TUNER

Nominal Output Level

UNBALANCED OUTPUT A(MONO), B, : 1 k
ELECTRIC GUITAR AMP OUTPUT

Reference Pitch

BALANCED OUTPUT A, B:

600

3 cents

PHONES:

33

Recommended Load Impedance

10 k
Display
7 segments LED
Controls
ON/OFF pedal
MEMORY pedal
MEMORY pedal
BODY TYPE knob
BODY knob
STRING ENHANCE knob

A4: 438445 Hz (1 Hz units)

Tuning Accuracy

Connectors
INPUT jack (1/4 inch phone type)
PHONES jack (stereo 1/4 inch phone type)
ELECTRIC GUITAR AMP OUTPUT jack
(1/4 inch phone type)
UNBALANCED OUTPUT A (MONO) jack
(1/4 inch phone type)
UNBALANCED OUTPUT B jack (1/4 inch phone type)
BALANCED OUTPUT A jack (XLR type)
BALANCED OUTPUT B jack (XLR type)
AC Adaptor jack
Power Supply
DC 9 V: Dry battery (R6/LR6 (AA) type) x 6, AC Adaptor

BASS knob
MIDDLE GAIN knob
MIDDLE FREQ knob

Current Draw
120 mA

TREBLE knob
REVERB knob

Expected battery life under continuous use:

Carbon:
9 hours

OUTPUT LEVEL knob

Alkaline:

PRESENCE knob

SELECT button
WRITE button

23 hours

These figures will vary depending on the actual conditions of

use.

PITCH button
BYPASS/MUTE button
STEREO/MONO switch
NOR/LIFT switch

Dimensions
250 (W) x 180 (D) x 60 (H) mm
9-7/8 (W) x7-1/8 (D) x 2-3/8 (H) inches

25

Specifications

Weight
1.9 kg (including batteries)
Accessories
Owners Manual
Dry battery (R6 (AA) type) x 6
*

We recommend that alkaline batteries be used when replacing

the batteries.

Options
AC Adaptor (PSA series)
*

0 dBu = 0.775 Vrms

In the interest of product improvement, the specifications

and/or appearance of this unit are subject to change without
prior notice.

26

For EU Countries
This product complies with the requirements of European Directive 89/336/EEC.

For the USA

FEDERAL COMMUNICATIONS COMMISSION

RADIO FREQUENCY INTERFERENCE STATEMENT
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee
that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that may cause undesired operation.
Unauthorized changes or modification to this system can void the users authority to operate this equipment.
This equipment requires shielded interface cables in order to meet FCC class B Limit.
For Canada

NOTICE
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.

AVIS
Cet appareil numrique de la classe B respecte toutes les exigences du Rglement sur le matriel brouilleur du Canada.

03344990

03-8-1N