Throwing another wrench into this discussion. The forward motion of a oscillating diaphragm creates the negative pressure. Does that correspond to the original acoustic wave?I think that microphones and recording techniques are completely irrelevant in the context of audio playback. Because whatever was done with polarity during production, that's the product they were happy with, so that's what needs to be played back.
For proper playback, all that matters is that your speaker pushes the woofer forward for waveform peaks and pulls it back for troughs. If it does that, it's working correctly. If it does the opposite, it's working incorrectly. That obviously goes for the speakers used in production too, because we want consistency.
This speaker behavior can be easily checked with an audio editor and a very low frequency square wave.
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Which way is up? (Which way does a loudspeaker driver move?)
In a recent video by PS Audio/Paul, he mentions the sentiment that many probably share with him, that a loudspeaker driver works by compressing air as it moves outwards. This illustrates perfectly that you can work with loudspeakers for decades without ever understanding how a loudspeaker...
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