Adcom gfa-5500 sounds like **** when turned up loud,whats the issue? distortion lights dont come on.

well i can help you . tell me the wire color

not unless it has a Bridge switch OR you design an inverter circuit for one of the inputs. If it has XLR inputs you can try to invert pins 2 & 3 on one of them, that might work...

If you're friendly about it , the folks at ADCOM will probably give you a schematic
Call and talk to tech support

Hi...
You'll need to take it to a Pro.
Where in the US are you ? I could suggest a repair shop maybe.
The trouble is either failed power supply capacitors and/ or a couple of power transistors gone bad in the trouble channel.

Possibly. Most amps filter out line hum via low-pass filters. If you can locate a schematic, those would be the caps to check.

I would contact Adcom for a service place near you

go to radio shack near you and change the fuse with the same rate-------or any electronics store near you.

Have it serviced. Do you know what GFA stands for. People at Adcom do have a great sense of humor. Take it only to a high end audio servicer. Contact Adcom. This is good stuff you wouldn't want a hack working on it.

Check the Fuse. Unplug the AC first. If you replace the fuse and it blows again, disconnect all speakers, replace the fuse and turn on. If the fuse does not blow, chances are it is a speaker problem, Adcom builds some very solid product, I would suggest pulling the outdoor speakers and testing them.
Depending on what you are using, some outdoor speakers should never be taken out of the living room. If you still have an issue post a comment and I will help some more.

Adcom makes a great amplifer! Usually broken highs and no bass means blown speaker. Try hooking it up to a completely different input source. Try different speakers also. If problem persists, check the fuse. Most will have a fuse on the back you can screw out. Some have two fuses (one for each channel) If this doesn't fix the problem it could be expensive to fix. Also, does this model ave the thermal protection light and if so, does it come on at all?