K F 8 5 0 z R S p e c i f i c a t i o n s group · S

3-WAY FULL-RANGE TRI-AMP

See TABULAR DATA notes for details

CONFIGURATION
Subsystem
Transducer Loading
LF 1x 15 in cone Horn-loaded
MF 1x 10 in cone Horn-loaded
Radial Phase Plug™
HF 1x 2 in exit, 3 in voice Horn-loaded
coil neodymium compression driver
Operating Mode
Amplifier Channels External Signal Processing
Tri-amp LF, MF, HF DSP w/3-way filters
PERFORMANCE 1
Operating Range 70 Hz to 20 kHz
Nominal Beamwidth
Horz 55°
Vert 40°
Axial Sensitivity (whole space SPL)
LF 101 dB 70 Hz to 275 kHz
MF 110 dB 275 Hz to 1050 Hz
HF 111 dB 1050 Hz to 20 kHz
Peak Sensitivity (whole space SPL)
LF 104 dB 20 Hz to 20 kHz
MF 111 dB 20 Hz to 20 kHz
HF 116 dB 20 Hz to 20 kHz
FEATURES Input Impedance (ohms)
Nominal Minimum
• Tri-amplified VA™ 3-way full-range system
LF 8 7.7 @ 120 Hz
• Touring industry standard MF 8 9.7 @ 1000 Hz
• Stackable version without fly-track hardware; 20% weight savings HF 8 9.2 @ 5010 Hz
• Companion SB850zR subwoofer Recommended High Pass Filter
High Pass =>60 Hz, 24 dB/octave Butterworth
DESCRIPTION Accelerated Life Test 2
LF 75 V 700 W @ 8 ohm
The KF850 Series has been the touring system standard for well
MF 56 V 400 W @ 8 ohm
over ten years, being acceptable in more technical riders than any
other loudspeaker. The KF850z incorporates a number of advances HF 40 V 200 W @ 8 ohm
in loudspeaker technology and performance developed over that Calculated Axial Output Limit (whole space SPL)
time by EAW Engineers. The result is a KF850 with higher impact Average Peak
and fidelity than ever before. LF 129 dB 135 dB
MF 136 dB 142 dB
Legendary KF850 performance is enhanced with a neodymium,
HF 134 dB 140 dB
Orbital Magnet Array™ HF driver offering increased surface area for
better cooling, and higher reliability. A new HF horn extends HF ORDERING DATA
response and fidelity while minimizing throat distortion. The critical MF Description Part Number
subsystem is based on EAW's Radial Phase Plug™ design used in KF850zR Black 0007587
the KF650, KF750, and KF760. An optional user-installed, passive Optional Accessories
MF/HF crossover kit allows more economical, bi-amplified operation. KF850z/SB850z caster pallet 0007683
The KF850z's advanced performance will not be sonically KF850z/SB850z caster pallet kit 0008835
compatible with existing KF850E inventories. To facilitate KF850z bi-amp crossover kit* 0007951
integration, kits are available to upgrade them to the KF850z. The KF850z upgrade kit [AP6] 0006241
KF850z's enclosure is fully compatible with the KF850E Series. KF850z upgrade kit [NL8] 0006242
However, the "z" enclosures incorporate a stacking pad on top that * The bi-amp crossover kit can only be used on a factory-built KF850z. It cannot be used on a KF850
mates with a recess in the bottoms. KF850z DSP processor settings originally manufactured as an “E” series and later upgraded to a KF850z.
are available online for EAW's MX8750 as well a select group of
other popular touring processors.
KF850 Series applications continue to include: concert tours,
corporate events, large theaters, stadiums, cathedrals, large live
music clubs. Six year warranty.

1 To achieve specified performance, the listed external signal processing with EAW-provided settings is required.
2 For recommendations to select power amplifier size refer to : “HOW MUCH AMPLIFIER POWER DO I NEED?” on the EAW web site.

Eastern Acoustic Works One Main Street Whitinsville, MA 01588 tel 800 992 5013 / 508 234 6158 fax 508 234 8251 www.eaw.com
EAW products are continually improved. All specifications are therefore subject to change without notice. RD0166 (A) KF850zR SPEC February 2004
K F 8 5 0 z R S p e c i f i c a t i o n s group · S
ENCLOSURE
Material Baltic birch plywood
Finish Wear resistant textured black paint
Grille Powder-coated perforated steel

(16.50)
4.00
C
L A

9.25

NOTES:
29.50 1. SYMBOL INDICATES CENTER OF BALANCE.
2. WEIGHT APPROX. 206 LBS.
15.75
8.50 3. SHIPPING WEIGHT APPROX. 228 LBS.

19° A
TOP
DIMENSIONS APPLY 2X 22.10
TOTOP AND BOTTOM 4X 6.44
ACCESS PANEL
GRILLE PARTIALLY SHOWN 2X 5.22
26.37 8X HANDLE CL

4X 10.81
2X 3.28 INPUT 3.50
42.37 2X 27.28

CL
42.00
21.00
16.10

FRONT 6.50
VIEW A-A
DIMENSIONS APPLY BACK
TO BOTH SIDES
4.25 PALLET RECESS
BOTTOM ONLY
CL

9.50

11.62
BOTTOM
KF850zR

PRODUCTION EASTERN ACOUSTIC WORKS

NOTE: This drawing has been reduced. Do not scale.

Eastern Acoustic Works One Main Street Whitinsville, MA 01588 tel 800 992 5013 / 508 234 6158 fax 508 234 8251 www.eaw.com
EAW products are continually improved. All specifications are therefore subject to change without notice. RD0166 (A) KF850zR SPEC February 2004
K F 8 5 0 z R S p e c i f i c a t i o n s group · S
PERFORMANCE DATA See NOTES GRAPHIC DATA Notes for details

Frequency Response: Processed Tri-amplified

LF = green MF = Black HF = orange Complete = blue
120

110

100
SPL (dB)

90

80

70

60
10 100 1000 20000
Frequency (Hz)

Frequency Response: Unprocessed Frequency Response: Digital Signal Processor

LF = green MF = Black HF = orange LF = green MF = Black HF = orange
120 20

110 10

100 0
dB re 0.775 V
SPL (dB)

90 -10

80 -20

70 -30

60 -40
10 100 1000 20000 10 100 1000 20000
Frequency (Hz) Frequency (Hz)

Impedance Magnitude Beamwidth (-6 dB SPL Points)

LF = green MF = Black HF = orange Horizontal = orange Vertical = black
100 400

100
Degrees
Ohms

10
10

1 1
10 100 1000 20000 100 1000 20000
Frequency (Hz) Frequency (Hz)

Eastern Acoustic Works One Main Street Whitinsville, MA 01588 tel 800 992 5013 / 508 234 6158 fax 508 234 8251 www.eaw.com
EAW products are continually improved. All specifications are therefore subject to change without notice. RD0166 (A) KF850zR SPEC February 2004
K F 8 5 0 z R S p e c i f i c a t i o n s group · S
INPUT PANEL SIGNAL DIAGRAM

3-Way, Tri-Amp (LF, MF, HF)

NEUTRIK NEUTRIK

PIN 1--...NC
PIN 1+...NC AMP HF
PIN 2--...LOW--
PIN 2+...LOW+
PIN 3--...MID--
PIN 3+...MID+
PIN 4--...HIGH-- DSP
PIN 4+...HIGH+
NL8 MPR NL8 MPR
EQ AMP MF
DELAY
HPF/LPF

KF850zR AMP LF
S/N
WHITINSVILLE, MA USA
MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING U.S. PATENTS: 5,996,728; 6,009,182; 6,016,353; 6,094,495; 6,118,883

LEGEND
DSP: User-supplied Digital Signal Processor for EQ, crossover, and delay.
HPF: High Pass Filter for crossover or Recommended High Pass Filter.
LPF: Low Pass Filter for crossover.
LF/MF/HF: Low Frequency / Mid Frequency / High Frequency.
AMP: User-supplied Power Amplifier.
XVR: Passive LPFs, HPFs, and EQ integral to the loudspeaker.

NOTES
TABULAR DATA
1. Primary Measurement/Data Processing System: FChart: proprietary EAW software.
2. Secondary Measurement System: Brüel & Kjær 2012.
3. Microphone Systems: Earthworks M30; Brüel & Kjær 4133
4. Measurements: Dual channel FFT; length: 32 768 samples; sample rate: 48 kHz; logarithmic sine wave sweep.
5. Measurement System Qualification (includes all uncertainties): SPL: accuracy +/-0.2 dB @ 1 kHz, precision +/-0.5 dB 20 Hz to 20 kHz, resolution 0.05 dB; Frequency: accuracy +/-1 %,
precision +/-0.1 Hz, resolution the larger of 1.5 Hz or 1/48 octave; Time: accuracy +/-10.4 µs, precision +/-0.5 µs, resolution 10.4 µs; Angular: accuracy +/-1°, precision +/-0.5°, resolution 0.5°.
6. Environment: Measurements time-widowed and processed to eliminate room effects, approximating an anechoic environment. Data processed as anechoic or fractional space, as noted.
7. Measurement Distance: 7.6 to 8.0 m. Data is referenced to other distances using the Inverse Square Law.
8. Volts: Measured rms value of the test signal.
9. Watts: Per audio industry practice, “loudspeaker watts” are calculated as voltage squared divided by rated nominal impedance. Thus, these are not True Watt units of energy as defined by
International Standard.
10. SPL: (Sound Pressure Level) Equivalent to the average level of a signal referenced to 0 dB SPL = 20 microPascals.
11. Subsystem: This lists the transducer(s) and their acoustic loading for each passband. Sub = Subwoofer, LF = Low Frequency, MF = Mid Frequency, HF = High Frequency.
12. Operating Mode: User selectable configurations. Between system elements, a comma (,) = separate amplifier channels; a slash (/) = single amplifier channel. DSP = Digital Signal Processor.
IMPORTANT: To achieve the specified performance, the listed external signal processing must be used with EAW-provided settings.
13. Operating Range: Range where the processed Frequency Response stays within -10 dB SPL of the power averaged SPL within this range; measured on the geometric axis. Narrow band
dips are excepted.
14. Nominal Beamwidth: Design angle for the -6 dB SPL points, referenced to 0 dB SPL as the highest level.
15. Axial Sensitivity: Power averaged SPL over the Operating Range with an input voltage that would produce 1 W at the nominal impedance; measured with no external processing on the
geometric axis, referenced to 1 m.
16. Peak Sensitivity: Highest axial SPL measured within the 20 Hz to 20 kHz bandpass with an input voltage that would produce 1 W at the nominal impedance; measured with no external
processing on the geometric axis, referenced to 1 m.
17. Nominal Impedance: Selected 4, 8, or 16 ohm resistance such that the minimum impedance point is no more than 20% below this resistance over the Operating Range.
18. Accelerated Life Test: Maximum test input voltage applied with an EIA-426B defined spectrum; measured with recommended signal processing and Recommended Protection Filter.
19. Calculated Axial Output Limit: Highest average and peak SPLs possible during the Accelerated Life Test. The Peak SPL represents the 2:1 (6 dB) crest factor of the Life Test signal.
20. Recommended High Pass Filter: This should be used to help protect the loudspeaker from excessive input signal levels below the Operating Range.

GRAPHIC DATA
1. Resolution: To remove insignificant fine details, 1/12 octave cepstral smoothing was applied to acoustic frequency response and 1/3 octave cepstral smoothing was applied to the
beamwidth and impedance data. Other graphs are plotted using raw data.
2. Frequency Responses: The variation in acoustic output level with frequency for a constant input signal of 2 volts (4 ohm nominal impedance), 2.83 volts (8 ohm nominal impedance),
or 4 volts (16 ohm nominal impedance) referenced to a distance of 1 m. For processed systems, this applies where the processor gain is 0 dB in the Processor Frequency Response graph.
3. Processor Response: The variation in output level with frequency for a constant input signal of 0.775 V = 0 dB reference.
4. Beamwidth: Average angle for each 1/3 octave frequency band where, starting from the rear of the loudspeaker, the output first reaches -6 dB SPL referenced to 0 dB SPL as the highest
level. This method means the output may drop below -6 dB SPL within the beamwidth angle. Referenced to 20 m.
5. Impedance: Variation in impedance magnitude, in ohms, with frequency without regard to voltage/current phase. This means the impedance values may not
be used to calculate True Watts (see 9 above).

Eastern Acoustic Works One Main Street Whitinsville, MA 01588 tel 800 992 5013 / 508 234 6158 fax 508 234 8251 www.eaw.com
EAW products are continually improved. All specifications are therefore subject to change without notice. RD0166 (A) KF850zR SPEC February 2004