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Old 28th November 2015, 03:06 PM   #1
diyAudio Member
 
Join Date: Jan 2007
Location: Lisboa
Default ARTA - FR compensation

Hello,

I have bought OmniMic but since it doesn't allow dual-channel measurements I decided to give ARTA a try.

I've read the manual several times but some things are not clear.

I borrowed an 'ART USB DualPre' sound card from a friend and I've decided to measure its response so I got this graph:

Click the image to open in full size.

I saved the response and I got this file 'placa.txt' attached.

My question is, if I now use this curve as the 'FR compensation' in ARTA setup I get this result:

Click the image to open in full size.

...which is fine but as you can see the SPL is now 0 instead of 130dB.

So I tried to change the values on the frd file by adding or subtracting 130 in order to adjust this but whatever I do, I get strange spikes in the final compensated response.

Click the image to open in full size.

What am I doing wrong?

Thanks!
Attached Files
File Type: txt placa.txt (60.8 KB, 3 views)

Last edited by cochinada; 28th November 2015 at 03:11 PM.
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Old 28th November 2015, 04:42 PM   #2
diyAudio Member
 
Join Date: Jan 2007
Location: Lisboa
First problem solved!

I just had to change the decimal separator from '.' to ',' to manipulate the file on the excel and forgot to change it back before importing it to ARTA.

Now I have a second question.

=>>> How can I import two compensation curves (one for the sound card and the other for the mic) if I have only the option to import one curve?
Morevoer the two curves have different Frequency values as the sound card was obtained directly on ARTA whereas the OmniMic was from the manufacturer.


The two curves are in attach.
Attached Files
File Type: zip compensation curves.zip (19.0 KB, 5 views)

Last edited by cochinada; 28th November 2015 at 04:49 PM.
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Old 6th December 2015, 09:05 PM   #3
Svein_B is offline Svein_B  Norway
diyAudio Member
 
Join Date: Oct 2005
You are obviously a perfectionist since you bother to compensate for a quarter of a dB variations in the fr.

When you do acoustic measurements with a microphone a small fraction of a dB is insignificant so you should only need to load the mic fr compensation.

--
SB
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Old 7th December 2015, 11:03 AM   #4
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Join Date: Jan 2007
Location: Lisboa
Yes I am but I was concerned with the decay above 15KHz. Anyway my new sound card doesn't have this issue so I will use only the compensation mic curve.
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Old 24th January 2016, 03:17 PM   #5
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Join Date: May 2014
You will have to manually add them in Excel, ARTA can only handle 1 curve atm!
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