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Aux feed subs?
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<blockquote data-quote="Silas Pradetto" data-source="post: 90107" data-attributes="member: 34"><p>Re: Aux feed subs?</p><p></p><p></p><p></p><p>Evan, Gert is correct. No, adjusting amplitude of a passband does not affect the phase of that passband, but it will change the acoustical crossover point, and therefore, the phase relationship at the acoustical crossover point may no longer be aligned after the amplitude changed.</p><p></p><p>So, if you're all set and aligned at 100Hz and the acoustical crossover is at 100Hz that's great. But if you boost the subs bringing the acoustical crossover up to 130Hz (which happens all the time!!!), then you have to check the phase at 130Hz now to ensure it's still aligned.</p><p></p><p>Any system tech worth their salt tries to get the phase responses of the subs and tops to align as far as possible on either side of the acoustical crossover, for just this reason. I like a minimum of one octave either way from my usual 80Hz crossover, but often try to go as high as 200Hz. </p><p></p><p>The phase relationship of the subs to the tops is only relatively constant if the subs and tops are co-located. If they're separated, any and all alignments are a compromise.</p></blockquote><p></p>
[QUOTE="Silas Pradetto, post: 90107, member: 34"] Re: Aux feed subs? Evan, Gert is correct. No, adjusting amplitude of a passband does not affect the phase of that passband, but it will change the acoustical crossover point, and therefore, the phase relationship at the acoustical crossover point may no longer be aligned after the amplitude changed. So, if you're all set and aligned at 100Hz and the acoustical crossover is at 100Hz that's great. But if you boost the subs bringing the acoustical crossover up to 130Hz (which happens all the time!!!), then you have to check the phase at 130Hz now to ensure it's still aligned. Any system tech worth their salt tries to get the phase responses of the subs and tops to align as far as possible on either side of the acoustical crossover, for just this reason. I like a minimum of one octave either way from my usual 80Hz crossover, but often try to go as high as 200Hz. The phase relationship of the subs to the tops is only relatively constant if the subs and tops are co-located. If they're separated, any and all alignments are a compromise. [/QUOTE]
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