First, switch connections right at the back of the speakers in order to see if the problem is in the speakera themselves or perhaps in your cabling/linefeed. If the problem changes sides, it wouldn't be the speaker at fault.

Different volume levels could be caused by any number of things, not necessarily a different amplifier, which, with the same power supply, couldn't really make more power anyway.

Very easily could be something in the gain-staging area *before* the actual power amps.

Just send 'em back, they will get to the bottom of it for you.


--Mac