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Just to update this thread, I have since upgraded to a ski-pass mounted subwoofer, and I recently installed a new amp that allows for incremental phase adjustment between 0 and 180 degrees. The sub - when measured to the head position - is within a few inches of the same distance as the midbass drivers, so naturally I assumed that they would be in phase with each other...but having all that adjustability at my fingertips, I went ahead and measured the SPL at the crossover point between 0 and 180 degrees adjustment. Well, turns out that the highest SPL at the crossover point is achieved between 150 and 180 degrees out of phase. It shows that in the car environment, one should never make any assumptions based on physics alone, better get out the SPL meter and measure for yourself.
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