I can't seem to figure this out, on my 91 SE.

I have aftermarket headunit, 4 channel amp, front coaxials and rear coaxials and a single 12" sub. (basically replaced all the Bose components).

I am running my front speakers off the headunit. The amp has 2 channels running the rear speakers and 2 channels bridged powering the sub.

Every thing was nice and dandy and sounded good until I played my system loud on one cold night. The had been sitting all night and I started it up, and immediately pumped up my system.

Here is the problem. Sound is coming from all four speakers, and the sub, except that the bass is gone from the rear and front speakers.

For some wild reason, I get the feeling that my 40x4 headunit is now putting out 10X4. When I fade to the front speakers, there is not much punch now.

What may have caused this? The headunit still functions fine, except that its not putting much power out, (I think)

 

sounds like a crossed wire ....pull out the HU and check all the wires are tight in the connecters in the harness. I just put a HU in my brothers firebird yesterday and when the remote wire from the amp touched the blue turn-on lead in the HU harness, all the speakers inside got really low in volume...??? dunno y, but that is what happened to me and sound very similar to your problem. Hope this helps.

-blake

 

That wasn't the problem I was thinking would be associated with cold. I know the older speakers needed to warm up. Otherwise the surrounds would be too brittle and could crack apart. But with all speakers affected equally it does sound like a power or signal issue.

 

I definately feel its the headunit. I will pull it out and see if some wire is touching ground or something else.

I will post the results. Thanks guys.