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Old 28th February 2015, 01:58 AM   #1
kuer is offline kuer  Canada
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Default Passive subwoofer phase?

I use a passive subwoofer with a dedicated amp to drive, sounds good. Today I re-placed the sub in the room, seems there is a different feeling for low bass. Not sure if it is about the phase change.

I reversed the positive and negative connections of the subwoofer, frankly I didn't hear any difference.

Wondering if there is a phase adjusting matter for passive subwoofer? Thanks.
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Old 1st March 2015, 04:39 PM   #2
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The different feeling in the low bass is very likely down to the effects of an acoustically small (at LF) room. Excite it from a different place, and you'll get a new frequency response.

If you're not hearing any difference by reversing the phase (presumably, with the rest of the system playing), something has gone wrong - you ought to be getting a deep null at the crossover frequency between subwoofer and main speakers.

Chris
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Old 3rd March 2015, 02:59 PM   #3
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Quote:
Originally Posted by chris661 View Post
If you're not hearing any difference by reversing the phase (presumably, with the rest of the system playing), something has gone wrong - you ought to be getting a deep null at the crossover frequency between subwoofer and main speakers.
Chris,

Subs and main speakers may not, and often don't have the same phase response at the acoustic crossover frequency, so reversing polarity may not make much difference at all, especially when the sub and mains are not co-located.
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