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Multi-Way Conventional loudspeakers with crossovers

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Old 19th March 2013, 02:04 PM   #5741
Jmmlc is offline Jmmlc  France
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Quote:
Originally Posted by gedlee View Post
Posting impulse responses is no problem and step responses are just the integral of the impulse response so they become obvious from the impulse response. I don't plot out phase anywhere, although all of my measurements and plotting is done complex so the phase is there, I just don't have any use for looking at the phase as a stand alone parameter.

What do you want to do with this data? That will help me to decide what to get you.

I could post the HolmImpulse raw data files which will contain the phase if desired, but they can only be viewed from within Holm.
Hello Earl,

To share with the others I think it is better to use a .wav format (eventually under .txt format)

Best regards from Paris, France

Jean-Michel Le Cléac'h
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Old 19th March 2013, 05:20 PM   #5742
gedlee is offline gedlee  United States
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Except that I don't have the impulse responses in .wav format, so that is not going to happen. They would be .txt format.
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Old 19th March 2013, 05:26 PM   #5743
Jmmlc is offline Jmmlc  France
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Hello Earl,

Well, I am sure someone on this forum will help to translate the IR in a more open format that the Holm format.

Best regards from Paris, France

Jean-Michel Le Cléac'h
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Old 19th March 2013, 07:08 PM   #5744
gedlee is offline gedlee  United States
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Just noticed that Holm will export wav files, but you cannot attach .wav files, so .txt is all that I can do.
Attached Files
File Type: txt Abbey30.txt (120.8 KB, 50 views)
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Old 20th March 2013, 01:54 AM   #5745
AllenB is offline AllenB  Australia
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For what it's worth, a false file name extension could be used although I believe anything could be posted once it's '*.zip'ped.
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Old 20th March 2013, 02:39 AM   #5746
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Quote:
Originally Posted by gedlee View Post
Just noticed that Holm will export wav files, but you cannot attach .wav files, so .txt is all that I can do.

Hi Earl,

Thank you for quick response with Abbey’s IR. Text file works for me OK.

I have a couple of questions thought. (1) what was the sampling rate, and (2) what type and length of window was used?. I am trying to correlate with the FR posted on your website.

Next, I am also interested other loudspeakers, particularly in Summa’s IR, as it seems to be your popular flagship.

Best Regards,
Bohdan
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Old 20th March 2013, 02:56 AM   #5747
pos is online now pos  Europe
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Here is the impulse in a txt format that HOLM can read (only the second column)
Attached Files
File Type: txt Abbey30_ir.txt (97.1 KB, 13 views)
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Old 20th March 2013, 03:01 AM   #5748
pos is online now pos  Europe
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And here is the impulse and frequency response, with phase inversion and manual offset adjustment
(assuming 44.1khz sampling here)

With gating just before what appear to be the first reflection
Click the image to open in full size.

And smoothed without gating, just to see/guess what is going on down low
Click the image to open in full size.
Attached Images
File Type: png Abbey30.png (36.9 KB, 550 views)
File Type: png Abbey30-smooth.png (20.7 KB, 408 views)
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Old 20th March 2013, 03:26 AM   #5749
pos is online now pos  Europe
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and now just for the fun the same impulse corrected using rePhase:

phase linearizion of an LR24 at 1200Hz, and a closed box at 100Hz with bessel Q
(no other phase EQ used)

That fits quite well with the theory, which tends to indicate this speaker is very well behaved and filtered (as expected)
Attached Images
File Type: png Abbey30 rePhase.png (38.7 KB, 190 views)
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Old 20th March 2013, 12:12 PM   #5750
Jmmlc is offline Jmmlc  France
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Hello Pos,

As nobody seems to want to do it, could you please, put the corresponding .wav files attached to a message on that thread after changing the extension .wav by .txt so it could be accepted as an attached file. Then everyone can turn back the file extension to.wav which is a more general format than the one used in Holm.

Thank you!

Best regards from Paris, France

Jean-Michel Le Cléac'h

Last edited by Jmmlc; 20th March 2013 at 12:15 PM.
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