When engaged, the incoming signal is flipped 180°. Although this is not dangerous to a speaker or amplifier, proper power delivery and speaker response is not possible with reversed speaker wires. Accidental reversal of speaker wires can happen when the wires are not properly labeled for polarity. All SVS subwoofers feature a continuously variable 0-180 phase control which allows the most complete range of adjustment in small increments to achieve the best sound possible. This action is known as making the speaker "out of phase," and results in audio oddities. When you reverse the polarity of a subwoofer, the subwoofer’s driver moves inward while all other speaker drivers in the system are moving outward. The blue sine wave is what the signal would look like if we engaged the polarity inversion button. This is done when the sub seems to lag from the other speakers. In-Phase Subwoofer Wiring When subwoofers are wired correctly (in-phase) all woofers in the system push out (into the vehicle) on the positive side of the music signal and pull back on the negative half of the music signal. In the manual of Sub2 (Elac 303 EPS) they explain that polarity setting - will give in general the best result with the main speakers. I'm pretty much a newbie, but AFAIK, it's a practice to do reverse polarity when your sub is out of phase, there are HU's and Xovers that allow you to change/reverse polarity/phase without touching the wires. In the image below, the red sine wave is normal incoming signal. I want to greate "push-pull" so both subs work as one. This reverse polarity condition is what causes the bass cancellation. The button associated with it, generally found on each channel of your mixer or DAW, Inverts the Polarity of that channel’s signal.

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