AVS Special Member
Join Date: Dec 2007
Location: Southern California
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To check for a bad speaker, get a multimeter and check the resistance across the speaker terminals.
The main thing you are looking for is that two speakers that are the same model should measure the same. The actual value is not important, and this is NOT the impedance of the speaker you are measuring, but the DC Resistance, which is not the same.
If one is a lot lower than the other, something is probably shorted out in that one (or open in the other one).
To cause what you are experiencing, it would have to be a pretty bad short.
If they check OK that way, try connecting one speaker at a time to a known good amplifier or an audio signal generator.
As far as that one channel that has low output, exchange that speaker and the other one of the same type. If the problem moves with the speaker, the speaker is bad.
If the problem does not move when you swap the speakers, it is obviously the receiver channel that is bad.