Bizarre problem with amp...

[Eric D]

I have a Soundstream REF705s in my truck. Sometimes the stereo works perfect. Other times the right speaker will cut out completely. If I turn the volume up past about half, the speaker comes back on. It will stay on for some time even if I turn the volume back down, but will eventually go away again. At volume past half it never stops working. Once and awhile the issue will happen on the left speaker, and sometimes even on my sub, but both of these cases are quite rare.

The amp is stereo bridged, so the main four channels are now two running the right and left, the sub channel runs my single sub.

I swapped the RCA inputs to the amp (only a single pair drive the whole amp), and the issue remained with the right speaker.

The best example I can give is it acts kind of like a signal sensing subwoofer for a home theater. With them, sometimes they don't kick in until the signal is large enough.

Anyone have any idea what is going on, or what I should try next? My plan is to replace the amp with something PG.

[jbob0124]

My plan is to replace the amp with something PG.

Problem solved

My first guess would have been the RCA inputs, but if you've already replaced them, then I guess thats out.

[tonym]

My plan is to replace the amp with something PG.

Problem solved

My first guess would have been the RCA inputs, but if you've already replaced them, then I guess thats out.

I like that Idea also....

[ttocs]

sounds like a solder joint that after it is heated up doesn't make contact anymore? Try powering it up and try to lightly flex the board with just your fingertips and see if you can isolate it to one area.

[todd217]

over on diyma there is the guy who designed the reference amps ill see if i can find his info on there. found him http://www.diymobileaudio.com/forum/members/ace956.html

[The Golden One]

like ttocs said it could be a bad solder joint but also sometimes a half blown transistor wont make contact until enough current and heat past trough it to make the contact. this is a very rare thing to happen indeed usually the oposit happens the transistor will make contact until more current and heat pass trough it and then it fades out. actualy it would be more easy to find the bad transistor in the first situation because it wont make contact when you read it with a meter.