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HOLMImpulse: Measuring Frequency- & Impulse-Response
HOLMImpulse: Measuring Frequency- & Impulse-Response
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Old 8th June 2019, 04:59 PM   #1101
Lojzek is offline Lojzek  Croatia
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Marabella,

try the c=a*b

a=driver response
b=mic calibration
c=corrected response by the mic cal
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Old 8th June 2019, 08:44 PM   #1102
marabella is offline marabella  Germany
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Quote:
Originally Posted by gedlee View Post
It appears that the mic EQ contains almost 10 dB of boost at the high end. Not a very good mic I would say. Or the cal file is wrong.
Yes, this Superlux ECM 888B is a cheap 50 microphone and yes, the calibration file is not correct, although the guys from Hifi-Selbstbau - Startseite did everything right in their measurement setup.

But that's not my point. I was surprised what HI did with the original values during the import of the cal file.

But this "transformation" seems to be consistent. I now have compared the ARTA measurements with the HI measurements and both are congruent.

Whatever HI is doing: It fits. For now I am reassured but not satisfied.

Lojzek: I did follow your advice.
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Old 27th June 2019, 11:37 AM   #1103
jbator is offline jbator  Poland
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I'm failing to measure FR for some twetter (Klipsch K-77M). Impulse windows shows complete mess and on FR there is not anything useful. From signal configuration I see that min measuring freq is 1kHz. Can my problems come from fact that this tweeter don't have much output below 2kHz? Can I do something about it?
I had no problem to measure complete (3way) speaker with XO or "better" twitter alone.
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Old 27th June 2019, 05:52 PM   #1104
jbator is offline jbator  Poland
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Ok I found it, too much gain for microphone preamp.
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Old 7th July 2019, 10:15 AM   #1105
Mario Pankov is offline Mario Pankov  Europe
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HOLMImpulse: Measuring Frequency- & Impulse-Response
Default Technical issue with HOLM

I had to change computers and decided it was time for a new interface. Got a Komplete Audio 6.

My problems:

Often while using Holm I get an error message and application closes. If i try to do a loopback calibration, it would pop up all the time and even if I chose "continue", it closes. I use it on a core i5 with 4GB of memory, Gforce 920 and Windows 10. The HOLM is 64 bit version.

Second problem is I am unable to measure distortion now, it just doesn`t show up. Tried anything, no luck. The driver in use is Asio in HOLM, installed is Asio4all, but I also tried MME with no resolution. Harmonics now just show NA.

Tried reinstall, reboot and etc, nothing works. Here is a screenshot of the error message (pic below).
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File Type: jpg Holm issue.jpg (344.1 KB, 157 views)
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Old 10th July 2019, 11:49 AM   #1106
tthorsten is offline tthorsten  Germany
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You can use the Isemcon EMX7510 its very good and affortable

http://www.isemcon.com/datasheets/iS...20EMX-7150.pdf
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Old 10th July 2019, 05:40 PM   #1107
Mario Pankov is offline Mario Pankov  Europe
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HOLMImpulse: Measuring Frequency- & Impulse-Response
Nevermind, I got this sorted out. Turned out to be the audio driver. Holm does not like the Asio driver much so switching to MME fixed it (although latency got up). Both distortion and calibration work as before.
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Old 5th August 2019, 08:29 PM   #1108
fakamada is offline fakamada  Poland
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Default Best smoothing method for measuring at listening position.

Amplitude or complex? Which one is better? They give me dramatically different results. See the pictures (1/3 and 1/6 smoothing). Same measurements, different smoothing methods. I'm trying to eq speakers to target curve.
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File Type: jpg 16.JPG (54.1 KB, 91 views)
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Old 6th August 2019, 02:37 PM   #1109
gedlee is offline gedlee  United States
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Complex smoothing is what you want. The term "complex" is poorly chosen since it is not "complex" in the mathematical sense, but in the fact that it is more complicated.

Complex smoothing is not constant across the bandwidth, but gets wider as the frequency goes up. This is much more like the way that we ear. for EQ purposes the "complex" 1/3 octave would be your best choice.

It does appear to me that your gating is too long - too many room reflections.
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Old 6th August 2019, 02:40 PM   #1110
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by gedlee View Post
the way that we ear
Best unintentional pun on this site. Ever.
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