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Old 31st January 2012, 02:05 AM   #211
Djim is offline Djim  Netherlands
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Old 31st January 2012, 04:15 AM   #212
tb46 is offline tb46  United States
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Hi Djim,

If that's the case, then this microphone is a joke (only a really bad one).

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Old 31st January 2012, 04:38 AM   #213
Djim is offline Djim  Netherlands
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Hi Oliver,

Measurements come from well known German company, so measuring with this mic without knowing its error rate could be qualified that way.

There are a few Dutch DIY sites that provide useful info to build your own with a Sennheiser KE4-211-2i-1 capsule (89 Euro). The Behringer housing could be usefull for that :-)

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Old 31st January 2012, 04:52 AM   #214
tb46 is offline tb46  United States
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Hi Djim,

Thanks for the additional info.

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Old 31st January 2012, 07:59 AM   #215
barco is offline barco  Sweden
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Quote:
Originally Posted by Djim View Post
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Yes, I saw this graph when I was googling around for some info on the mic. That is why I added microphone performance as a possible (and likely) source of "unknown".

I will look into finding a better mic, but I am not really into spending a lot of money (although without good measurement, the EQ doesnt really make any sense....)
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Old 31st January 2012, 07:07 PM   #216
Djim is offline Djim  Netherlands
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Hi Barco,

The link in my earlier post is quiet simple to build and costs about 110 Euro in parts. This Sennheiser capsule is also used in more serious measuring mics. Sennheiser does deliver a measuring chart that is pretty accurate.

The Monacor ECM-40 is a budget measuring mic (70 Euro) that seems to have better production lines and a better capsule compared to the Behringer. But its a fact that budget mics have their limits below 40Hz (for budget SPL meters its the same).


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Old 1st February 2012, 08:30 PM   #217
tb46 is offline tb46  United States
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Hi Djim,

Thought you might find this interesting: ARTA Chamber for the Lower End Microphone Calibration:

http://www.fesb.hr/~mateljan/arta/Ap...r-Rev03Eng.pdf

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Old 1st February 2012, 08:38 PM   #218
Djim is offline Djim  Netherlands
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Hi Oliver,

Thanks for sharing, but to be honest, I'm not so sure how precise that method will work for (infra) low frequencies. Link
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Old 1st February 2012, 10:00 PM   #219
tb46 is offline tb46  United States
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Hi Djim,

The method seems to be good at least to 1Hz looking at the graphs provided. Any lower than that I simply don't care.

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Old 1st February 2012, 10:18 PM   #220
barco is offline barco  Sweden
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Interesting discussion!

I started looking into solutions for this "problem" with uncalibrated microphones and ran into this SOFSCI SoundSweeper Acoustic Measurement Kit | Sounds of Science

They claim:
2dB 10Hz to 19Hz
1dB 20Hz to 20kHz
1.5dB 20kHz to 24kHz

Which must be considered to be very good?
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