This is kind of strange. I worked with over 100 of the Pioneer BS22's, which had serious quality control issues. But I never encountered one that was wired out of phase. Tweeters and woofers generally have different sized tabs for positive and negative inputs, and this should prevent any miswiring at the factory. So that leaves the input terminals on the back. If one of the speakers had reversed wiring, that would throw both the woofer and tweeter into reverse phase. The simplest way to check phase is to place the speakers face-to-face about 1" apart and to move the receiver's balance control slowly from left to right playing music with lots of bass content. If the sound in general, and the bass in particular, is loudest with the control in the center position, then the speakers are in phase with each other. If the sound is loudest with the control to the left or right, they they're out of phase.
