and while this might not be the best way, to test for their phase, you could simply turn up your power amp to near stupid loud levels, and gently thump on your strings. Out of phase speakers lack bass and audio tends to lack body when played out of phase. if not, you'll have to resolder one or both of them. Let's take a sine wave ( f(x)= sin(x)) A cosine wave can be represented as sin( pi/2 - x ) Now let's plot both the functions in the same graph: The cosine wave is the sine wave moved 90 degrees to the left. In phase must be correct and out of phase must be wrong… Right? watch for both speakers to move at once in the same direction. For starters, zoom in on the waveforms in your DAW and compare the peaks and valleys of different tracks. Not necessarily. hopefully, they've both moving out. I said (and I know I could very possibly be wrong) that it doesn't matter if you mix up the + and - wires, as long as every speaker is wired the same. If the sub and mains are out of phase, the woofer cones on the main speakers will move backward while the subwoofer cone moves forward, and vice-versa. You can wire positive to the negative terminals on speakers … That's bad. In this case, one wave is positive while the other is negative, and vice versa. The result is a signal that is twice the amplitude of each individual signal. For this reason, it’s worth exploring other options. You can also access more phase tests here: Online Stereo Polarity (Phase) Sound Test Note that out of phase wiring cannot damage either the speakers or the amplifier. If two tracks are only slightly out of phase, for example, a polarity flip alone will leave you stuck choosing between the lesser of two evils. I used to run my subs out of phase which often made them sound much more part of the system instead of a big speaker sitting in the boot. Have you ever heard people say their speakers or subwoofers are in phase or out of phase? That's good. In some circumstances, it may not even be apparent without careful listening. I had a discussion with a colleague today, and we had a disagreement about wiring speakers out of phase. Each speaker has a positive (+) and negative (-)terminal. The positive phase of both waves are aligned and the negative phase of both waves are aligned. Phase cancellation can also occur by simply wiring speakers incorrectly, inadvertently reversing the polarity of one channel. THe front soundstage via the two front speakers wont be centred correctly. This is called constructive interference. It’s surprising how many home stereos — and even project studios — have their monitors wired out of phase. If so, do you really know what that means? Anytime two identical signals are mixed together with inverse polarity, the signals cancel out. They'll cancel each other's output. It may not even be apparent without careful listening heard people say their speakers subwoofers... 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