chrisbyn

I've got my radio functioning now (had a circuit short issue) and I get sound out of 3 of the 4 speakers. The driver's side front speaker has only static. I tried fading to only the back speakers and that helps, but there is still a considerable amount of static. I took out the speaker and now listening to the radio is "acceptable" (as much as it can be with only 3 speakers).

Bad speaker or bad amp? I'll probably pull out the other front speaker and swap them around to see for sure, but thought I'd see if anyone has had this happen to them before.

Thanks,
Chris

JrRifleCoach

Amp. If memory serves me correctly the culprit is a "cap" on the amplifier board.

I bought a set of spare speakers long ago as backups. So I can't help with recommending a repair shop. Maybe someone else has the needed info.

THE 383 admiral

My left speaker amp. blew up a resistor & A npn-d transistor

mako41

Bose speakers rarely go bad, the problem is most likely the amp built in to the speaker enclosure. Check out these links;

http://www.carstereohelp.com/repairD...vetteAudio.htm
http://forums.corvetteforum.com/c4-t...more-time.html
http://www.carstereohelp.com/stereor...etteFspk89.htm

chrisbyn

i went to radio shack and bought new caps and replaced them all. Still the same problem. Does anyone know where to get the four FETs or the 2 ICs? Everything that I'm seeing online talks about the caps. In my case, I think it's one of the other parts. I can handle soldering them on and with the components being so cheap, I'd rather do it myself than spend around a 100 for someone else to fix it.


BTW - My goal is to keep my car 100% original (well - as close as one can get to being 100%), so suggestions to toss it and move on to aftermarket are understood/appreciated, but not getting me to my goal.

chrisbyn

So I did want to ask about this...found this from one of the recommended URLs.

Checking Bose Speakers

Bose speaker are rarely defective. It is a good idea to give the speakers a visual inspection for water or for physical damage to the paper cone. Swap suspect speakers to a known working enclosure for testing.

Bose speakers can not be replaced with aftermarket speakers. Aftermarket speakers are four ohm. Bose speakers are one to two ohm. Installing an aftermarket speaker in place of a Bose speaker automatically cuts the Bose amplifier power 1/4 to 1/2 it's original output.


When I did change the speaker out, it was an aftermarket speaker....so could it be possible that the same behavior was masked by using a non-bose speaker? I'm at work now - i'll try an actual bose speaker when I get home but if anyone has any thoughts i'm all ears.

THE 383 admiral

Sorry you can't be a parts chaser. Becouse you read someone replaced there CAP.
If the CAP was blown you would have noticed the top was split or fluild leaking.
You need to inspect your board. on all the resistors, diode's, transistors.. and so on.. you will have a blown part somewhere.

chrisbyn

Yeah I've been staring at it trying to find the culprit.

chrisbyn

I did a quick recording of the problem. It's on http://youtu.be/_cHVmHSmzbI if you're interested in hearing it.

Rontopia

I am no bose expert, but static but no sound sounds like an amp with a bad input. Did you ever try putting the good speaker in the side that's bad? If it stillnputs out static than you know it either the wire or the output in the head unit.

mixalive

I believe these FET's are for the Bose amps - Mosfet N-CH 55V 14A TO220FP:
http://www.digikey.com/product-searc...bf-nd&x=8&y=19
$1.57 each
They also have the correct value / length capacitors - 820uf 16V:
http://www.digikey.com/scripts/DkSea...ords=p10252-nd
$1.03 each

These parts are too cheap.. And thru-hole soldering is too easy..

One of my amps is cracking at moderate volumes (snare drum) and the caps had already been replaced. I have the new FET's but haven't replaced them yet. Will post a followup after installing.

86GreenwoodVette

I got 2 speaker boxes with amps in them- all was working when I pulled them, my neighbor bought the speakers from me, he didnt want the amps or the boxes. They are from an 86 - I will send you both boxes and 2 amps for 50.00 - if you are interested and you should have what you need to end this nightmare.