<font color='#000000'>The proper phasing between left and right speaker can usually be checked as follows. Play a mono signal, reverse the connections to one of the speakers (reversing its phase) and listen again. One way or the other, the mono image should seem much larger and more diffuse, and THAT is the out of phase condition. If it sounds equally diffuse either way, then one of the speakers may indeed have an internal wiring problem, such that its own drivers are not properly "in phase" relative to each other.
Try testing with a mono signal. Correct phase is usually very easy to spot this way.
Chuck</font>