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Car Audio Discussion
General Car Audio
phase alignment procedure of the subwoofer with the main
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<blockquote data-quote="RobGMN" data-source="post: 8870769" data-attributes="member: 683408"><p>What equipment are you using? It can be done physically (placement of sub), electrically (reversing wiring), electronically (DSP).</p><p>If your amp has a phase "switch", you only have two options. In that case, select a piece of music you are VERY familiar with from hearing it on a good system, play it at a reasonable level. Literally switch phase back and forth. One of them with sound more "right" than the other, even if not perfect.</p><p></p><p>If you have DSP, then you can use REW plus your DSP to find the right setting by doing sweeps of mains, then subs (one at 0, the other at 180 degrees), then look at the overlap of the two sweeps.</p><p>When you see cancellation instead of summation at common frequencies, that is your sub working out of absolute phase with the mains.</p><p>[ATTACH=full]56811[/ATTACH]</p><p></p><p></p><p>You could actually just test the mains and the sub separately, then simply reverse the phase of the sub in REW to create the second "test", and compare the three sweeps.</p><p></p><p>I like to do actual sweeps just in case an electrical change causes changes other than simply reversing cone motion.</p></blockquote><p></p>
[QUOTE="RobGMN, post: 8870769, member: 683408"] What equipment are you using? It can be done physically (placement of sub), electrically (reversing wiring), electronically (DSP). If your amp has a phase "switch", you only have two options. In that case, select a piece of music you are VERY familiar with from hearing it on a good system, play it at a reasonable level. Literally switch phase back and forth. One of them with sound more "right" than the other, even if not perfect. If you have DSP, then you can use REW plus your DSP to find the right setting by doing sweeps of mains, then subs (one at 0, the other at 180 degrees), then look at the overlap of the two sweeps. When you see cancellation instead of summation at common frequencies, that is your sub working out of absolute phase with the mains. [ATTACH type="full"]56811[/ATTACH] You could actually just test the mains and the sub separately, then simply reverse the phase of the sub in REW to create the second "test", and compare the three sweeps. I like to do actual sweeps just in case an electrical change causes changes other than simply reversing cone motion. [/QUOTE]
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phase alignment procedure of the subwoofer with the main
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