I recently hooked up an old Crown DC-300A in our garage to help pump out some tunes while I workout. Anyways after fiddling with it for a while, I came to the conclusion that one channel is shot but I'd like a second opinion. Channel 2 plays everything beautifully, whereas Channel 1 plays everything as if I have a busted speaker. To troubleshoot the matter, I first thought I may indeed have a busted speaker so I switched the speaker cables and to my surprise, the other speaker sounded busted. This ruled out a speaker being the culprit. I then swapped the input lines, also made no difference, the same speaker was at fault. Finally settling on the fact that I may have a bad set of output cables, I swapped each channel's cables, but the same speaker was playing poorly. So now I've narrowed it down to having a bad channel and would like to know a couple of things. 1) Did I miss something? 2) Is there a common reason for an amp's channel to make a speaker sound busted?