Re: Subwoofers in phase or out? a quick question

Posted by Drew Eckhardt (A) on March 29, 2007 at 11:57:21

In Reply to: Subwoofers in phase or out? a quick question posted by mattcecil1@yahoo.com on March 28, 2007 at 11:02:30:

Due to distance your subs lag 128 degrees at 80Hz and 64 degrees at 40Hz.

Minimum-phase low-pass functions have phase lag and high-pass functions phase lead. This holds whether the functions come from electrical or mechanical effects - phase lead increases with decreasing frequency from every loud speaker driver + enclosure combination in the world. An electronic all-pass filter can compensate for this with phase lag that decreases with increasing frequency).

IOW, phase inversion could put your mains and subs back in phase or out of phase where they have overlap. You really need to measure.

If you really want your sub-woofers and main speakers to integrate well you need complimentary acoustic cross-over slopes (magnitude and phase).

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Follow Ups Full Thread

Topic - Subwoofers in phase or out? a quick question - mattcecil1@yahoo.com 11:02:30 03/28/07 (13)

I got them to work perfect, in Phase & cool as heck.... - mattcecil1@yahoo.com 08:10:17 03/30/07 (0)

If your subwoofers affect the vocals, then they are playing bass frequencies the main speakers should handle - Richard BassNut Greene 07:41:46 03/30/07 (0)

Re: Subwoofers in phase or out? a quick question - Drew Eckhardt 11:57:21 03/29/07 (0)

Re: Subwoofers in phase or out? a quick question - Bruce from DC 16:30:50 03/28/07 (5)

Interesting about the Velodyne - Schu 05:14:02 03/29/07 (2)

The SMS is stereo IN with a summed mono OUT to your sub...n/t - NewStevo 07:28:56 03/30/07 (1)

That certainly is good news - Schu 08:30:59 03/30/07 (0)

thanks Bruce - mattcecil1@yahoo.com 16:45:13 03/28/07 (1)

Here are some links - Bruce from DC 09:45:20 03/29/07 (0)

Re: Subwoofers in phase or out? a quick question - David Aiken 14:08:34 03/28/07 (0)

Re: Subwoofers in phase or out? a quick question - Schu 12:06:23 03/28/07 (2)

Re: Subwoofers in phase or out? a quick question - mattcecil1@yahoo.com 12:26:28 03/28/07 (1)

Re: Subwoofers in phase or out? a quick question - Schu 13:39:59 03/28/07 (0)

Follow Ups

Re: Subwoofers in phase or out? a quick question - Drew Eckhardt 11:57:21 03/29/07 (0)

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