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If I'm not running any rear speakers, will it sound better if I have the 6x9 holes open or should I seal them off? I do have a sub in the trunk and I'm sure it will be affected by whether or not I have gaping holes in the rear deck,

 
Rep Power: 338

open.
its like having the back seats permanently folded down!
let all that nice bass into the cabin.....

 
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Thank you for your input. Now all I have to do is get my lazy *** up and pull the rear deck off and get the 6x9s that are in there out.

 
Rep Power: 345

removing the rear deck sucks. definately remove the 6x9's though. while you're in there...dynamat!