Car Stereos: Amplifier problem, channel amp, resister

Question
My amplifier is alpine 4 channel amp. All channels work except for one. At one point I connected two speakers to one channel to try the speaker out, so i had two speakers on one channel. Im sure its the amp and I'm wondering how to fix it.

Answer
Cesar, if that is the case, it is not too hard to fix, but it is somewhat hard to identify where to fix.  If you pull the case off the amplifier, you will see a large circuit board.  Following the circuits from the one channel back across the board, you may see a burnt spot that has become detached, or there may be a capacitor or resister blown.  If you do not see a burn spot on the board itself, then you will need to test each capacitor and resister to determine their condition.  Once you have isolated the correct part to fix, you just unsolder the original part and reinstall a new one.  Hope this helps, Scott