rePhase, loudspeaker phase linearization, EQ and FIR filtering tool - Page 18

Pano · 1st January 2013, 08:04 PM

I don't have REW. What can I show you in HOLM or rePhase?

thierry38efd · 08:13 PM

impulse of correction in HOLM

it's must start slowly and finish at a maximum at t=0.
can you show the magnified impulse ?

resulting impulse is a symetrical one when you convolve by hand (C=AxB)

Pano · 1st January 2013, 08:20 PM

I spoke too soon. I do have REW, but can't find the GD display. I'll show you the rePhase impulse in HOLM.

thierry38efd · 1st January 2013, 08:27 PM

it's seems to be Ok.

check for last version of REW.(5.01)

Pano · 1st January 2013, 08:31 PM

Will do, thanks.

So you do think this impulse when convolved will correct phase only of my woofer response?
That seems to be what I'm seeing, but could be wrong.

thierry38efd · 1st January 2013, 08:41 PM

Quote:

So you do think this impulse when convolved will correct phase only of my woofer response?
That seems to be what I'm seeing, but could be wrong.

you're right,only in the lows and for the bass reflex delay.(picture below )
a simple way is to do a 4 feets mic measurement of loudspeaker,extract excess delay,and applied theoritical phase linearizationn for full range.

here's your correction (bass reflex 37 Hz)

john k... · 1st January 2013, 10:22 PM

Quote:

Originally Posted by Pano

I don't know John. I just exported the impulse wave from rePhase and plugged it into my player software - JRiver Media Center. I could be that it's upside down, I don't know. Will try to figure it out. I either have convolution turned on or turned off, if that's what you mean.

If you turn the convolution turned on and off I don't think it's a valid comparison. What you need to do is keep the convolution on all the time and change the impluse being processed.

kgrlee · 1st January 2013, 10:36 PM

Quote:

Originally Posted by john k...

If you turn the convolution turned on and off I don't think it's a valid comparison. What you need to do is keep the convolution on all the time and change the impulse being processed.

Why is that John?

Pano · 1st January 2013, 10:36 PM

OK, but if it's a "perfect impulse" (1 sample on, all others off) it should do nothing, right?
I'll try it.

john k... · 1st January 2013, 10:51 PM

Quote:

Originally Posted by Pano

OK, but if it's a "perfect impulse" (1 sample on, all others off) it should do nothing, right?
I'll try it.

Why? Because you don't know what the effect of the convolution engine is. Yes a perfect impulse should do nothing but which is why it's a good check on whether the convolution engine introduces any artifacts of its own.

1st January 2013, 08:10 PM	#172
thierry38efd diyAudio Member Join Date: Jan 2006 Location: grenoble	impulse of correction in HOLM it's must start slowly and finish at a maximum at t=0. can you show the magnified impulse ? resulting impulse is a symetrical one when you convolve by hand (C=AxB) Last edited by thierry38efd; 1st January 2013 at 08:13 PM.

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1st January 2013, 08:04 PM	#171
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	I don't have REW. What can I show you in HOLM or rePhase?

1st January 2013, 08:27 PM	#174
thierry38efd diyAudio Member Join Date: Jan 2006 Location: grenoble	it's seems to be Ok. check for last version of REW.(5.01)

1st January 2013, 08:31 PM	#175
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Will do, thanks. So you do think this impulse when convolved will correct phase only of my woofer response? That seems to be what I'm seeing, but could be wrong.

1st January 2013, 10:36 PM	#179
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	OK, but if it's a "perfect impulse" (1 sample on, all others off) it should do nothing, right? I'll try it.