There's still one problem... if you're going to use a 12" sub to reproduce, say ALL the sound below 120HZ, you should ideally also be pulling the input from all four 8" woofers in the car. If I remember correctly from the dolby diagram, there are two on the hat shelf and one in each of the doors; the ones in the doors are receiving different musical info than the ones in the back. Perhaps you could use two 12" subs, run one off of the front left and one off of the back right woofers via a crossover, then use a bass blocker on the other two to most accurately reproduce ALL of the low frequency bass. It is unlikely that all the bass would be concentrated in one quadrant (i.e. left front, or left rear... usually it would be reproduced in at least two speakers). Anyone looked at the pro-logic diagram lately to see if this makes any sense?
-Jon
--
CPT Jonathan T. Belmont-- '99 C70R 48K 'Valdemar'