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But it doesn't go out the window. Time alignment is useful whether parked or driving. So is eq.
My last build was in a cheap economy car. 98 dodge neon. I had 0.8ms of delay between the left and right midrange, and I had relocated my seats further back and used kick panels to minimize path length differences. That 0.8ms of delay was dead obvious whether driving or parked. I had 5ms of delay between the driver side midrange and the subwoofer. It took 5ms to get the subwoofer to sound like it was in the front, and not coming from behind me. Again, that didn't change whether parked or driving. I had different eq settings for the left and right side, to compensate again for sitting off center. Also noticeable whether parked or driving.
The bottom line is, dsp is NESSESARY when building a sound quality system, no matter what car, no matter what amps, no matter what speakers, no matter what install.
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