I would estimate interference from the rarefaction of air by one set of subs and the compression of the others, but this doesn't seem to be the case. For some reason, the subs sound better reversed from the rest of the rooms peakers and that is what baffles me. The polarity on the incoming sub signal from the tuner amp is correct.
The two ten inch subs are powered from a seperate amp (seperate from the tuner.a standalone HT amp).
Running into the waves fail gif full size#
I have two satellite speakers in the front.Įverything in the sytem is correct polarity, and the two full size floor speakers sound like shit reversed. I alo have 2 yamaho full ize floor speakers, each with 12 inch subs, mid, and tweeter. I have 2 ten inch subs in a homemade box with a front firing port and front firing 10 inch subs (2). Okay, let me be more specific of how my setup is. Subwoofers with phase settings or receivers with distance settings can help you dial in the best match between multiple speakers.Īnd of course, there's also the issue of placebo.Īre you only flipping one at a time? Because flipping one's polarity while leaving the other alone can certainly have an audible effect. But through the mid bass moving speakers a few feet relative to each other or changing phase relative to each other can produce audible effects. Likewise once you get up to several hundred hertz the effects become lost in the general room reverberation. At the bottom end near 20hz the wavelengths become so long that the issue doesn't matter. At 80 hz, a typical cross over point between mains and subs, a 180 degree difference corresponds to a little more than 2 meters. But, if they're separated or then distance and symmetry relative to the room become a factor. If all the speakers were sitting in one pile close together, than making sure they all have the same polarity would be enough to ensure coherent summation. The OP is quite familiar with physics as I recall, so this wave interference behavior is probably old hat. Two signals will vary from louder to softer depending on how the relative phase between them varies from 0 to 180. What does matter is that the phase between multiple speakers _matches_. Reversing the polarity is a 180 degree phase shift, as DriverGuru says, for a single speaker this doesn't matter in the absolute sense, no matter the room or orientation: any modal effects the room has at 0 degrees it will also have at 180 degrees.
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