JKC Stereo Equipment Documentation PDF

JKC Stereo Equipment Documentation
Dear Philip, I am giving you this stereo equipment so you will remember me. It is very personal gift because I have spent
around 1000 hours to design and build it. I hope you will appreciate that and will enjoy it for very long time. I am giving it
on one condition, that you can NOT sell it for profit. However, you can pass it on your children if you wish doing so in the
future. Please read following information before using it.
JKC 787 Stereo Power Amplifier 50W
Specifications:
Input Impedance 100KOhm (without volume control)
Frequency Response 10Hz 70kHz (-3dB)
Signal / Noise Ratio -130dB
THD <0.007% (20Hz 20kHz)
Power Output 50W RMS on 8ohm speakers (0dB on VU meters)
Ready LED indicators for power supply control (should be ON during use)
Power delay circuit for protection during power-on cycle
Standby Power 84W (with bias current set to 600mA)
Operating Temperature 10-30C (heat sink will be hot all the time but can NOT excide 50C)
Design deep Class AB with FET and MOSFET transistors
Power Supply symmetrical 35V DC rails, 300W transformer and 53000uF filter per Channel
Weight & Dimensions 14kg, 17.75W 14.25D 6H
Back Panel Connectors:

Power 120V AC 60Hz with 3A fuse
R / L Channel inputs RCA insulated from chassis (R right channel, L left channel)
R / L Speaker Output banana with RED indicated Hot or + terminal (should match speaker polarization)
IMPORTANT NOTES:
This amplifier doesnt have Volume Control and can NOT be connected to analog signal sources without
volume control. Connecting it to devices without volume control can damage amplifier or speakers if signal is
too high.
Do NOT excide 0dB reading on VU (Volume Unit) meters to prevent signal Clipping which will cause damage
to the speakers (+ 3db is doubling power output). Reading can reach +2db on red scale for very short time but
for normal listening keep volume below red 3db scale.
During hot days (25C+) use fan in to remove hot air from the cabinet. External case and heat sinks on the side
can NOT be hotter than 50C to prevent power transistors from overheating and damage.
Input RCA cables should be high quality and as short as possible when connected to analog signal source.
Do NOT connect analog inputs to Digital signal sources, it will damage the amplifier and speakers.
When connecting amplifier to analog devices, make sure the volume is down at the source to prevent damage.
This amplifier can be connected to variety of analog signal sources like computers, tablets, mobile phones,
preamplifiers and Digital to Analog converters (DAC) providing that those devices have internal volume control.
This amplifier is set-up using sophisticated measuring equipment and it doesnt require any corrections during
normal use. Please do NOT open the case to make any adjustments. It should last very long time (hopefully to
your retirement age) if you will take care of it as I did.
JKC 787 Digital to Analog Converter
Specifications:
Signal / Noise Ratio -130dB
Analog Output 0-1.7Vpp (RCA)
Inputs: 2 Digital (SPDIF COAX 1 & 2 75ohm) and 1 analog (pass-thru requires volume control at the source)
Volume Control on both Digital Inputs (doesnt work for analog input)
Outputs: Phones (3.5mm) at the front and 1 Analog (to power amplifier RCA)
Supported Digital Signals: SPDIF TTL level for LPCM with 8kHz to 192kHz sampling rates, 8-32bit
Very Low distortion Class A Phone amplifier
Digital Signal Inputs RCA 1-Red & 2-Green (Yellow, Blue & USB NOT used)
Analog Input (pass-thru RCA R / L on top)
Analog Output RCA R / L (on the bottom)
Power Connector 120V AC 60Hz with power switch and 300mA fuse
Oppo 93 Blu-Ray Disc Player
This player supports all major media file formats from external sources (hard drive, USB stick, streaming).
Audio files: AAC, FLAC, MP3,WMA, M4A, WAV, APE

Video files: AVCHD, AVI, BDMV, MP4, MKV, MOV, MPG, OGG,TS, VOB, WMV
Image files: GIF, JPG, PNG
Album art will be displayed if embedded in MP3, APE and FLAC files (Mp3tag tool).
Subtitle SRT format is supported as separate file or embedded in container file. Advantage of SRT separate
file is that position on the screen can be adjusted and text is high quality because it is generated by Oppo
player (hard coded subtitles are image files, SRT is text file).
PSB Image T6 tower speakers
VIERA TC-L32X5 32" Class LED HDTV
Connections: (see diagram on the last page for details)
Power Amplifier L-R Output goes to PSB Speakers (use 12-14 AWG pure copper wire with banana plugs).
Make sure that polarity is correct between amp and speakers (there is white stripe on one wire). Speaker wire
should always be the same length for both L-R channels.
Power Amplifier L-R Analog Inputs goes to Analog Output L-R to DAC unit (use short cables).
Oppo Digital Audio coaxial output goes to DACs Digital Input 1 (Red RCA, use short high quality 75ohm cable)
Oppo HDMI 1 video output goes to TVs HDMI input (use short HDMI cable)
Oppo Analog Audio Output signal FL (white) and FR (red) can be connected to Analog Input RCA connectors
on DAC unit as an option. In this case Oppo internal DAC will be used (lesser quality) for signal conversion and
volume control on remote of Blu-Ray player (bypassing volume control on DAC unit). Analog Input on DAC unit
can be used to connect other devices with analog signal and volume control. For tablets and mobiles use RCA
to 3.5mm audio adapter (Y).
Digital Input 2 RCA on DAC unit can be used to connect another device with Digital SPDIF signal (75ohm short
quality cable).
Two USB connectors on Oppo can be used to connect external Hard Drive with the media files. USB can be
used for wireless connection to Internet by plugging in an adapter (for streaming media or firmware updates).
When using Digital Inputs (COAX 1&2) on DAC unit, make sure that LOCK LED is ON. If it is OFF that means
that digital signal is not supported or it is poor quality and can NOT be converted. MUTE LED is only ON when
there is no digital signal present on Digital Input 1 or 2. I2S LED is only ON when input switch is at Analog
position. SPDIF LED is ON when using Digital Inputs (COAX 1&2). If you hear spike noise that means
sampling frequency is not supported or bad digital input signal (amplitude too low or bad clock). This can occur
at very high sampling rates above 96khz (CD audio is using 44.1khz and DVD / BluRay 48khz and 96khz).
This DAC can decode digital signals with up to 384khz sampling rates, however above 96khz they must be
very high quality to assure proper conversion.
Have Fun my Son,
Jerzy Krzysztof Ciunkiewicz
Calgary April 29, 2015
NOTES:
For Digital SPDIF RCA connections high quality 75ohm video cables should be used (not analog RCA). USB
ports on Oppo 93 player can accept FAT32 and NTFS formated hard drives & USB sticks.

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JKC Stereo Equipment Documentation

JKC 787 Stereo Power Amplifier 50W

Back Panel Connectors:

JKC 787 Digital to Analog Converter

Oppo 93 Blu-Ray Disc Player

Audio files: AAC, FLAC, MP3,WMA, M4A, WAV, APE

PSB Image T6 tower speakers

VIERA TC-L32X5 32" Class LED HDTV

Connections: (see diagram on the last page for details)

Have Fun my Son,

Jerzy Krzysztof Ciunkiewicz

Calgary April 29, 2015

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