Question about Sony SA-WM500 Subwoofer

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Subwoofer Line In/Out Mix-up

I recently moved, so I had to re-connect all of the wires and speakers to my stereo.

I have a Sony SA-WM500 subwoofer and a Harman-Kardon AVR 635 amplifier/receiver. I accidently plugged the line out from the amplifier to the line out in the subwoofer and left it like that for about a week. When I realized my mistake, I switched it to the line in on the subwoofer. However, now I am not getting any sound at all.

I have an energy saver feature on the subwoofer, and I noticed that when I do test the subwoofer from the amplifier, the energy saver causes the subwoofer to turn on. Thus, it does seem to be receiving a signal.

Does anyone know what has happened? Have I damaged my receiver/amplifier or speaker, or both by making this mistake?

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Re: Subwoofer Line In/Out Mix-up

I had a problem with no audio and I recently found the fix. When the sub still worked and you turn it on you hear one relay click and then about 5 seconds later a second relay clicks and the audio comes on. The problem I had lies with that second relay. When you take the case apart there are 4 circuit boards. The big board with the two big blue capacitors is the main board. Well next to the two blue capacitors is a blue relay. That relay had a pin that came un-soldered from the circuit board. I re-soldered that pin and the sub works just like new. If you go here you can find a free service manual that has the wiring schematics for the amp. Hope this helps!

Posted on Jul 13, 2008

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Why don't you just set your receiver's individual relative speaker volume levels so the sub isn't weak by comparison to your other speakers? Weakness, as you call it, is relative.

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