Lower Volume from One Monoblock

After reading Tls49's response, I think I may have missed something.

"Swapping the monoblocks left to right the louder sound swapped too. The left channel is now lower in volume."

Did you actually swap the amps so that the IC's going from the preamp to amp remained connected to the same channel, or did you just swap the IC's? If its the former, then Tls49 is right. Disregard everything in my 1st post except the part about the Balanced/SE switches.

Make sure the 2 switches for Balanced/SE operation are both in the same position. If you have one on SE and the other on Balanced, the volume for each channel will be different. After that, swap the IC's going from your source to the preamp. Its possible that one of the other components is the problem.

As far as sound goes, what do you think if the Cary's? You don't say how long you had them for. Did you hear them before the problem? If you can use the Cary's as a reference, it may be helpful in the search for a new amp.