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The dash and door speakers are not connected in any way, other than both receiving a signal from the HU. The door speakers are run from the amp in the trunk, the dash and rear speakers are run from the HU. So technically it's already an active setup. Where our system lacks is the balance/fader control available from the OEM HU.
I'm going to put one amp behind the dash for those four speakers, and one amp in the trunk for the door speakers. The sub amp will be attached to the box. I'm going to make a simple first order crossover system for the other speakers, to high pass the dash and rears at 150 Hz and the doors at 60 Hz. The sub will play from 20-100 Hz.
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