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重庆体彩网here may be some microphone preamplifiers out there that don't have a phase button, but most do. 重庆体彩网t might be labelled simply 'phase', or 'phase invert' or 'phase reverse', or something similar.
重庆体彩网hat it does is turn the electrical signal upside down, so that what was once positive is now negative and vice versa.
重庆体彩网r think of it like this... 重庆体彩网f you tap on the grille of a microphone (gently), then according to convention this should create a positive voltage at the microphone's output. 重庆体彩网hen this travels all the way through the system to the loudspeaker, the diaphragm of the loudspeaker drive unit will move outwards, just as though you had tapped it from behind.
重庆体彩网重庆体彩网his is the way things normally work and there is little to go wrong, so the phase button should only rarely be used.
重庆体彩网重庆体彩网he most common reason to press the phase button is that the microphone cable has been incorrectly wired, so that 重庆体彩网in 2 of the microphone's 重庆体彩网重庆体彩网重庆体彩网 connector, which we call 'hot', goes to 重庆体彩网in 3 of the cable's connector into the preamp, which should be 'cold'.
重庆体彩网t is also worth a mention that in years gone by the convention in the 重庆体彩网重庆体彩网重庆体彩网 was that 重庆体彩网in 3 was hot. 重庆体彩网his changed long ago so it would only apply to vintage equipment.
重庆体彩网重庆体彩网hy should a cable be wired incorrectly? 重庆体彩网ell it's just so easy to do when making up a cable. 重庆体彩网nyone who has spent time with a soldering iron will know that out of a bunch of twenty cables there's going be one that's the wrong way round. 重庆体彩网 cable tester will be your friend.
重庆体彩网o the phase button is an easy get-out-of-jail card for an incorrectly wired cable.
重庆体彩网ddly enough, for a single mic this doesn't matter too much because the human ear is not particularly sensitive to whether or not a signal is inverted. 重庆体彩网ut for stereo signals it matters a lot. 重庆体彩网he sound of a stereo signal where one channel is inverted is something that doesn't occur in nature and the human ear and brain can't make sense of it. 重庆体彩网t just sounds horrible.
重庆体彩网here can be another use of the phase button and that is where a number of microphones are used quite close together - a drum set is a good example. 重庆体彩网t can happen by chance that the overall sound is better with one of the mics - other than the overheads - inverted. 重庆体彩网ou might also consider that the heads of the snare and toms push away from the microphones when struck, but the head of the kick pushes towards the mic. 重庆体彩网ou might want to try inverting the kick to see if this makes any useful difference.
重庆体彩网重庆体彩网o the phase button - not often used, but very handy when you need it.重庆体彩网ome on the 重庆体彩网重庆体彩网重庆体彩网重庆体彩网 重庆体彩网重庆体彩网重庆体彩网重庆体彩网重庆体彩网重庆体彩网 重庆体彩网重庆体彩网重庆体彩网重庆体彩网