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Not necessarily recommending this, but sound dampening the doors, trunk lid, spare tire, & rear license plate area will improve the sound quality you'll get from the sub and door speakers as well. In my opinion, the two 3.5" rear speakers are not worth messing with too much as most of your higher frequencies will come from your 6.5" speakers in the doors and potentially some new tweeters in the dash. The 4-channel amp in 2/1-bridge mode works pretty well IMO (leaving the two rear speakers powered by the head unit).
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