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Car Audio Discussion
General Car Audio
subwoofer T/A VS. phase
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<blockquote data-quote="thch" data-source="post: 4339399" data-attributes="member: 562032"><p>sounds about right.</p><p></p><p>as for the Q, well, a wave goes through 360d per cycle, and each cycle has some period, eg 20hz repeats 20 times per second, so 50ms per cycle. so every 50ms, 360d of the wave play. thats around 7d per millisecond.</p><p></p><p>and for 100hz, there is 360d per 10ms. so 1ms of delay is 36d of phase shift</p><p></p><p>looking at a few more points, its easy to see that a time delay means phase increases linearly with frequency.</p><p></p><p>this is not bad, as the group delay -- the difference in time arrival -- is zero.</p></blockquote><p></p>
[QUOTE="thch, post: 4339399, member: 562032"] sounds about right. as for the Q, well, a wave goes through 360d per cycle, and each cycle has some period, eg 20hz repeats 20 times per second, so 50ms per cycle. so every 50ms, 360d of the wave play. thats around 7d per millisecond. and for 100hz, there is 360d per 10ms. so 1ms of delay is 36d of phase shift looking at a few more points, its easy to see that a time delay means phase increases linearly with frequency. this is not bad, as the group delay -- the difference in time arrival -- is zero. [/QUOTE]
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subwoofer T/A VS. phase
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