If we reverse the other loudspeaker lead as well, so that both loudspeakers have reversed leads, both will now move away from you. The pressure wave from one loudspeaker is being “sucked out” by the other loudspeaker, also know as cancellation or “not as loud.” Reverse the leads to one of the loudspeakers and one loudspeaker moves outward (toward you, positive pressure) and the other moves inward (away from you, negative pressure). The two positive pressure waves add together and that means addition or “louder.” To picture why this happens, imagine a very simple pulse or “positive pressure wave” being reproduced by both loudspeakers simultaneously. You should notice a very apparent decrease in the lows when they’re wired the wrong way. Hearing this effect is quite easily demonstrated – listen to your home stereo loudspeakers while standing midway between them and then listen again after reversing the leads on one side. If both loudspeakers are moving outward at the same time the sound adds together, and if one is moving out while the other moves in, the sound cancels out, especially the low frequencies. Loudspeaker phase (actually, polarity) seems at first glance a pretty simple concept. It’s pretty common knowledge that if you get the wires mixed up when hooking up two loudspeakers that something “not good” happens.
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