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I have a factory headunit at the moment. I've purchased a small two-channel amp and some Infinity Reference 6.5" for the front doors.

Ideally i would like to place my small Pioneer GM-X372 amp under the front passenger seat. The amp is really quite small and should fit (10 1/16" x 1 15/16" x 6 5/8"). The amp will be in addition to another amp+sub in the trunk (which gets signal from splicing into rear speakers).

Do I yank the wires from behind the front door speakers and run them directly to the speaker-level inputs on my amp? Then run another set of wires out from amp through grommet to speakers?

Also, I have an amp in the trunk already powering a sub, and it is grounded to a bolt under the back seat somewhere. If my front amp is under the front passenger seat, where should I ground it to? Grounding it to the same location (under rear seat) might be too far?

 
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to make it real simple.....this is what I did.I took the factory harness behind the HU and cut the wires that fed the speakers.Then I took my amps speaker out puts and spliced them together...voila! no re-wiring of the door panels or any thing.

BTW IMy amp also puts out abot 125 watts to each factory speaker thru those small factory wires and never a problem. so you should be fine!

 
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I wouldn't recommend putting it under the passenger seat, everybody that I talked to that has done that so far has had problems with noise and all kinds of stuff...

 
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i wouldnt put it under the seat either too easily accesible to damage from anyone sitting in the back seat although i do have my strobe kit under my driver side seat

 
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well ive seen lots of amps ther and im proboly gonna put mine there too...doesnt make sense to have all sorts or long *** cable run going to teh trunk when they are powering speakers up front.Im just gonna build a very simple guard so no body's feet can hit the amp!

 
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But that does not mean to your amp will not be susceptible to noise and whatever other interference that will be thrown at it, especially with the airbag module (I believe that's what it is anyway) right above it, you can count on that thing causing a fair amount of noise

 
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You may have problems with it overheating also.

 
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there is no noise under the seat...especially if you use shielded cables.and alot of amps espoecially speaker amps (non sub) dont get that hot.if so you can mount 2 small computer fans (12v) top keep a consant airflow. I have a blaupunkt class T digitla amp and even pushing 400watts to my sub constantly it doesnt get even warm to the touch!!! they can be had very cheaply and they sound great!

 
Rep Power: 345

I have my CD player under my seat, but I put my X-over under the passenger seat...worst idea ever...it is a bad place to put anything...especially if that seat gets moved alot.