Some Electronics Help

Standalone Sony Muteki amplifier as an additional passive subwoofer amp.

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Sony muteki PCB

Standalone Sony Muteki amplifier as an additional passive subwoofer amp. HT-DDW5500 DDW7500 DDW8500 Recently my AV receiver Sony Muteki STR-KM7500 stopped working. It wasn’t worth fixing it so I bought a new one. New Sony models do not have subwoofer amp, and there was no system control for the amplifier. TA-KMSW500 will not power without master amp, so this is a solution how I fixed it. The power supply has to be started with master amp, until that doesn’t happen mains relay is off and the TA-KMSW500 doesn’t have any power that can be used. Simple solution is to add a link and to bridge the mains relay.

On the picture is marked with red where to insert the link (removing the  board is not hard). This is a simple solution but then the amp is ON all the time.

So I used different solutions and for that you even don't need to open the amp.


Sony system control is via stereo 3.5 mm jack.

USB for Sony system controll

Cut one USB cable, use 3.5mm plug or one of old Audio cables with 3.5 mm jack. Connect it as on the picture.

Notice that USB red 5V wire goes to plugs ground.

Black wire which is ground goes to other 2 pins which are in L and R channels.

Plug the 3.5mm jack to Muteki and USB to USB on your TV or amp.

This will Power up the subwoofer amp every time the TV or main amp is switched on and USB socket has power.

You may also want to know that one of pins where black wire goes is load limit protection which main amp was using to disable the subwoofer if something goes wrong.

If you find it helpful please make a comment, so I know it was worth writing this article.





0 # ron 2016-01-13 01:08
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+1 # david 2015-10-02 01:09
I couldn't get the lead method to work but your first option with joining the relay works a treat! I went one step better and added a switch in. Thanks again your a life saver.
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+2 # newbashell 2015-06-18 04:11
I hope that someone gets a laugh outa this newb question , i looked and looked at this diagram , got all the bits i needed , n had it down pat , red wire goes to that ground part and the black wire goes thru the holes in those 2 prong things , ok sorted , cut the USB cable n OMFG there is 4 tiny shitty little cables in there hmm wasnt expecting this, btw how the hell are you meant to strip those bastards? dam near ate half a meter of cable to get em all lol , ok so after looking at the diagram for another few hours my vast brain power tells me this and this is what i need to know -
1) the green secret wire goes to the left prong with the black?
2)the second sneaky white wire goes to the hole in the grounding prong?
3) the other faint red line i see is that going to the right prong with the black cable?
4) can the red wire to the grounding go thru the hole with the white cable or just solder that sucker to where the illustration shows?
5) am i just plain mental and im supposed to just use the red and black wire? , red to ground and black ground to left and right?

LOL thankyou please answer soon as im just sitting here waiting
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+1 # david 2015-10-02 01:11
ignore the other coloured wires they are for data transfer from usb. but his first method is easy to do.
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+1 # Neeraj 2014-11-07 12:29
Guys, this man deserves a whiskey. This fix worked like a bomb to trigger the amp into action.
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+1 # myrulet 2014-07-22 02:56
I am happy ,it was worth writing it.Love my additional subwoofer amp :-) .
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+1 # sergio 2014-08-13 12:58
Gracias, desde Argentina, me sirvio de mucho.--
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+1 # Dan K 2014-07-19 07:44
You my man are a legend !!!!!! Saved me a 50 from Sony !!!
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+1 # amauri nunes 2014-07-07 11:00
the option of use the Onkyo remote plug doesnt works, becouse the tension is very low and the receiver don't sustain the energy, just flashs.
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+1 # amauri nunes 2014-07-07 10:54
I'd tried, and it works just fine. thanks.
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+1 # amauri nunes 2014-07-06 20:33
very good, I didnt test it yet, but I'm in the same position. let me ask something, the other receiver that I bought is a Onkyo tx nr636, that has a jacket named remote control, like that of the sony receiver, wouldn't it function to power on the TA-KMSW500?
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