Question about phasing

[aggybong 10+ year member]

My Alpine 9830 has the following option for subwoofers:

# Subwoofer Phase Selector: The phase of the subwoofer outputs may be set to normal (0 degrees) or reverse (180 degrees); this function allows you to minimize phase cancellation of bass frequencies, for stronger bass response.

I notice that with it set to reverse (180 degrees), and the sub firing into the back of the car (towards the trunk), it sounds much better (louder). With it set to normal, I can barely hear the sub.

I am moving to a new car, a Mazda6, and have decided to keep the stock headunit and maybe throw on a Cleansweep to even out the frequencies. However, I won't have the phase selector any more, and I'm worried about the subwoofer sounding poorly because of it.

Is there a way to wire it so it's reverse, or is that a special headunit feature?

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[Immacomputer 10+ year member]

Flip the positive and negative wires on the amp. There is nothing special about it.

 

[aggybong 10+ year member]

Sweet, didn't know that's what it did.