When people are changing phase they are trying to align the amplitudes of the signal. When two signals(two speakers) are 180 degrees out of phase with each other they cancel each other out. Therefore you flip polarity to reverse the amplitude/align the phase. Reversing polarity is a elementary way of doing that. Because it flips the amplitude of the signal that means it delays the signal by half the phase length adding a rudimentary time delay.
Lol yeah that... I just call it bootleg time alignment lol.
1978 F250 2wd (460 c.i.d. / C6)- soon to give up the powerplant to an '80-'86 F150
White 2000 Grand Prix GT coupe One still slow and loud... other one scoots just a bit.