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that will work if the sub dosen't need to be sealed but why do you want to do it. it'll probably look goofy,

 
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You'll have to reverse the wiring. Positive goes in negative, and Negative goes in positive. That's how I've done mine.

 
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or just hit the phase shift button on your amp if you have one

 
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ya i have it on my deck too. i want to do it so that i can put my box where my spare is and so it looks like the sub is comin outta the floor backwards. it looks sweet. just wasnts sure if it was risky or if the sub needed somethin else to seal it.

 
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i used to do this by turning my subs so its faces the front of the car. i left the backseat down and way too many poor @ss ppl keep jocking my ****. so i just left it facing the trunk so it doesnt attract ppls eyes

i think you wouldn't get as much SPL if u face it front?

 
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we call it "invert mounting" the subwoofer. 9 times out of 10, the gasket foam is fine to seal it agasint the box, but if you hear any leaks, youll have to go invest in some gorilla snot, hot glue, or weather stripping.

no worries about inverting the phase (positive negative or negative positive.) Thats something you play with when tuning the amplifiers, to go with whichever phase sounds best in the car to you. so you dont need ot run it one way or the other, but rather which ever of either way sounds best.

 
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My buddy has 4 12 inch type Rs.. they are so nice.. just had to say that

 
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lol thanks guys, i just thought it looked nice so im gonna try it out.