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Multi-Way Conventional loudspeakers with crossovers

rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
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Old 30th April 2017, 01:23 PM   #2021
thierry38 is offline thierry38  France
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Hi,
Maybe with this kind of correction:

using phase EQ (range +-180)

something like this,or several narrow band,according to the measurement (and the frequency of the null).

Click the image to open in full size.
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Old 30th April 2017, 01:33 PM   #2022
torgeirs is offline torgeirs  Norway
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Do the Woofers have seperate FIR filters/amps
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Old 30th April 2017, 02:19 PM   #2023
bcodemz is offline bcodemz  Canada
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Quote:
Originally Posted by torgeirs View Post
Do the Woofers have seperate FIR filters/amps
Yes.

Quote:
Originally Posted by thierry38 View Post
Hi,
Maybe with this kind of correction:

using phase EQ (range +-180)

something like this,or several narrow band,according to the measurement (and the frequency of the null).

Click the image to open in full size.
I'm trying to do like a shelf filter for phase, something that'll increase phase shift by a constant amount based on the frequency. Using a parametric EQ to simulate a shelf filter shape isn't exactly ideal. Is there a way to do a shelf filter shape phase adjustment in rePhase?
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Old 30th April 2017, 04:09 PM   #2024
BYRTT is offline BYRTT  Denmark
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rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
Quote:
Originally Posted by bcodemz View Post
.....Is there a way to do a shelf filter shape phase adjustment in rePhase?
Suggest try start on "Paragraphic Gain EQ" tab and make those shelf filters data you think about which will create IIR filter phase shift, now go to "Paragraphic Phase EQ" tab and use whatever it takes to flatten phase shift again and maybe it helps using example three banks or more where one is set Q=1 next is Q=2 on then Q=4, in the end when phase is corrected flat then disable those IIR shelf filters and you end up have the phase shift only. Into these two tabs there is also convenient help commands in the "Tools" and "Preset" buttons.

Last edited by BYRTT; 30th April 2017 at 04:12 PM.
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Old 30th April 2017, 06:05 PM   #2025
torgeirs is offline torgeirs  Norway
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Phase shelf filter: Is that a all pass filter? Never remember if allpass is lp or hp unity gain.
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Old 30th April 2017, 07:11 PM   #2026
pos is offline pos  Europe
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Quote:
Originally Posted by bcodemz View Post
I'm trying to correct the phase issue of a rear firing woofer cancelling with the front woofer because of the difference in path length.
Hello
What you need in such a situation is simply delay and polarity switch
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Old 30th April 2017, 08:22 PM   #2027
torgeirs is offline torgeirs  Norway
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Oh, isn't the woofers in the same box?
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Old 30th April 2017, 08:41 PM   #2028
torgeirs is offline torgeirs  Norway
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If it is two seperate boxes in a room, use a room simulator, as the room nodes will take over the responce. Rew and others have good simulators.
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Old 30th April 2017, 09:28 PM   #2029
bcodemz is offline bcodemz  Canada
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Quote:
Originally Posted by BYRTT View Post
Suggest try start on "Paragraphic Gain EQ" tab and make those shelf filters data you think about which will create IIR filter phase shift, now go to "Paragraphic Phase EQ" tab and use whatever it takes to flatten phase shift again and maybe it helps using example three banks or more where one is set Q=1 next is Q=2 on then Q=4, in the end when phase is corrected flat then disable those IIR shelf filters and you end up have the phase shift only. Into these two tabs there is also convenient help commands in the "Tools" and "Preset" buttons.
That's a really smart idea. I'm gonna try that.

Quote:
Originally Posted by pos View Post
Hello
What you need in such a situation is simply delay and polarity switch
Wouldn't that turn my speaker into a cardioid in the woofer range?

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Originally Posted by torgeirs View Post
Oh, isn't the woofers in the same box?
Yes, woofers are in the same box.
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Old 30th April 2017, 09:37 PM   #2030
mark100 is offline mark100  United States
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rePhase, a loudspeaker phase linearization, EQ and FIR filtering tool
Hi guys,
why would this need anything more than what Pos said, simple delay and polarity ?
I get you can move pattern around such as cardioid, but don't you just end up ultimately using the delay/polarity that gives you the pattern you want?

Last edited by mark100; 30th April 2017 at 09:41 PM.
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