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WEll I got a new Poineer DEH6800 HU, some 6.5 Boston Acoutics for front and a Alpine F240 50Wx4 amp. I didn't plan on getting a sub (for now anyway). The front speakers will be wired to the amp but what should I do with the back speakers (stock ones for now). Should I run off the amp or the HU? I thought amp for now and then replace the rear ones with some nice 6x9s OR run stock off of HU and then get a 10" sub to run off other channel of amp. Not sure what to do. I am soldering the harness right now and undecided what to do. Any guru's have a suggestions.... something for now or future. thanks!!

 
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This is my take...
Run rear stock off the headunit, and amp the sub off the other two like you say. Replacing the rears are not only a biatch, but with the quality of your fronts, not necessary. You'd be much better served with some bass.

 
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here are my 2cents.. use the 4 channel to run the speakers.. when you get a sub you can get a mono amp or a 2 channel amp. I had a 5-channel old school mtx amp that gave me 360watts rms x 4 (90w channel) and then 400 watts rms x 4ohms dedicated for the sub.. dont use the headunit to run anything.. head unit power blows... Right now im using a 4 channel kenwood to run my polks (tweets, fronts and rears) and an Infinity Basslink II.. people think i have a 12" hitting in the trunk.. remember no headunit power.. but this is IMO

 
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I've got Infinity speakers running off of a 4-channel alpine amp. It sounds a lot better than stock. I plan on adding either a 10 or 12 in. sub in the future.

 
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thanks guys, I think though I will run the rca cables for the back and the sub just in case I want to do the rears and do a sub. Then I don't have to rip the car apart (again) just to run a rca cable. Is there any problem with doing that?? thanks!