xy phase problems?
xy phase problems?
hey all, anyone ever run into phase problems w/ xy as drum overheads? this is the first time i'm experiencing this, could it be bad wiring? the phasey sound is staggering when left as is, but as soon as i flip the phase on one mic, the sound fills out fantastically, and sounds normal. seems counterintuitive. curious if anyone has had issues w this before.
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I have a pair of Oktava MK319s that are wired with opposite polarities. It's kinda a pain but not a huge deal.
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yessir, sounds like something is wired out of phase, OR the x-y is just the slightest bit off.. doesn't take much distance in any of the 3 dimensions for one mic to end up opposite polarity of the other. Heck, drummer or whomever coulda inadvertently bumped a stand, just moving it a quarter inch, and hello hollow-town!
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This is impossible. There is no distance that the mics can be placed where the POLARITY will be opposite. Only the frequency that corresponds to the distance will be 180 degrees out.dubh dubh dubh wrote: the x-y is just the slightest bit off.. doesn't take much distance in any of the 3 dimensions for one mic to end up opposite polarity of the other.
Time and polarity are not related.
Yep. You'd have to have a point for the second mic where all frequencies were exactly out of phase with the first. Impossible in practice.
Take just an 80Hz bass frequency - (I think) that would require over 7 foot between mics. Every freq above will cancel at progressively shorter lengths.
Flipping the polarity on a second, non-coincident mic only ever reverses the existing phase cancellations - which may or may not "sound better' in context.
Take just an 80Hz bass frequency - (I think) that would require over 7 foot between mics. Every freq above will cancel at progressively shorter lengths.
Flipping the polarity on a second, non-coincident mic only ever reverses the existing phase cancellations - which may or may not "sound better' in context.
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d'oh! and thanks...
farview wrote:This is impossible. There is no distance that the mics can be placed where the POLARITY will be opposite. Only the frequency that corresponds to the distance will be 180 degrees out.dubh dubh dubh wrote: the x-y is just the slightest bit off.. doesn't take much distance in any of the 3 dimensions for one mic to end up opposite polarity of the other.
Time and polarity are not related.
AH sorry fellas... I WAS waaay oversimplifying and mis-using the vulgate, as it were... please forgive an auld insomniac for typing without brain engaged!vogon wrote: Yep. You'd have to have a point for the second mic where all frequencies were exactly out of phase with the first. Impossible in practice.
Take just an 80Hz bass frequency - (I think) that would require over 7 foot between mics. Every freq above will cancel at progressively shorter lengths.
Flipping the polarity on a second, non-coincident mic only ever reverses the existing phase cancellations - which may or may not "sound better' in context.
Yep. I shoulda just said that it doesn't take much of a mis-alignment to make things MAYBE sound not so good. Your mileage may vary, side effects may include rectal seepage and tinnitus...
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I mix/engineer/produce/reduce & make gear heinously misbehave in delightful ways.
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