Service manual acoutic research s108ps subwoofer

Open up the sub and check the filter capacitors in the power supply section.
In fact , check all the capacitors to see if any are bulging at the top, or leaking out the bottom.
The most likely suspects will be the filter caps right after the bridge rectifier though.
If that all looks good, do a resistance check on your ground leads between the sub and signal source. A bad ground can cause a signal hum too.

HI,

I'll let you know if the service manual is available for this model.

Hi,

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Goodluck..

Hey there houleo!
If your subwoofer has a stereo input and stereo outputs, then it's a good idea to send the signal from your receiver to the sub, then out to the other speakers you have hooked up. Some subwoofers will take the low frequencies out of the signal to the left and right speakers, so that the sub handles it alone. This often gives a nice crisp sound.
Reciever/amplifier
l l l l V V Subwoofer l l l L------> Right speaker
V Left speaker
If this helps you out, I'd appreciate if you rated me well :) If you've got any more questions, feel free to ask! Cheers! -The Chicken

What makes you feel that isn't right?

You can't just slap a sub onto a receiver and have it work optimally (if at all). The receiver must typically be configured to know it has a sub, then bass managment and sharing decisions must be made, then crossover frequency choices and levels adjusted to match it all up.

All self-powered amps work that way.

Have you looked at the manual for your JVC?

http://www.parts-express.com
check this site out i think you'll find what you need there.

Are you certain it isn't sensing a signal all the time? Disconnect its inputs first to prove it.

If you feel compelled to monkey with it, I'd start with the state of the Auto switch. It might be asserting "ON" instead of "Auto"

I should look at the main semi-conductor (perhaps on a heatsink) as being the most likely cause of it's failure.

Some subwoofers can sense the signal on their input and will only start when there's enough signal for long enough time for them to turn on the amp.

Try seting the "subwoofer signal out" on your reciever a bit higher, see if it does the trick, if not, try it with some other source (e.g. an mp3 or CD/DVD player) plugged directly into the subwoofer. If it still doesn't work, there's some other problem with your sub (bad connection inside sub, sub amplifier problems, maybe there's another fuse for the speaker itself, try to check it out).

If it works well with an alternate signal source, the problem might be either in reciever or the signal cable that you use, but could also be something else.

good luck

3rq8 (Triarcuate)

If your tuner has a sub out you use that together with a single rca cable for the signel