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Sony STR-KG800

Multi-Channel AV Receiver (2008)

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Sony STR-KG800


Tuning range: FM, MW

Power output: 90 watts per channel into 6Ω (stereo)

Surround output: 135W (front), 135W (center), 135W (rear)

Frequency response: 28Hz to 20kHz

Total harmonic distortion: 1%

Input sensitivity: 800mV (line)

Output: 800mV (line)

Digital inputs: coaxial, optical

Video Connections: HDMI, component, composite

Dimensions: 430 x 157.5 x 318mm

Weight: 7.8kg

Accessories: RM-AAU023 remote control

Year: 2008



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Reviewed Nov 05th, 2016 by Nobuhiro

Basic electonics design is ok for the price BUT (thanks to the service mannual provided by Ivy Caudieus) there are some PCB issues for certain serial numbers which lead to a very poor sound/surround quality. The grounding of the IC400 between VCC and VEE is missing. The result is no or very poor Bass restitution and mashed potato like overall sound. Also the autrocal does not work. Once the ground restored (pin 9 of IC400 - Main board) everything seems to breath quite nicely. If you want to extend bass restitution in the low frequencies for large front LS, you can increase the values of 2 capacitors on the Digital ab board (C1419 and C1420 0.1uF) the original low cut off frequency being around 150Hz. Wolfson app note mentions 10uF for 10K to ground....
For those who want to go this route Good luck!! you'll discover a new music system (provided that you have good speakers... not the Sony ones)...
PS: you can also inprove the Subwoofer but this is too long to explain...



re: STR-KG800

Just changed the capacitors and it indeed enable the speakers to sing below 150hz. Great tip!
However, removing these microscopic capacitors and soldering much bigger ones was a bit of a chalenge. Hope it will hold more than a couple of days...
I didn t notice anything wrong with the grounding on the main board.

Any info on what's wrong with the subwoofer?

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