These mic capsules look like good (better) alternatives to the panasonic capsules. So I am curious if anyone has built any diy mics around them for loudspeaker measurements ?
Low-Noise Binaural Mics (Primo EM172) | Zach Poff (see datasheet and where to buy in 'The News' section near the end of the page).
Low-Noise Binaural Mics (Primo EM172) | Zach Poff (see datasheet and where to buy in 'The News' section near the end of the page).
The Yahoo "Micbuilders" group is probably a better place to ask at < http://tech.groups.yahoo.com/group/micbuilders/ >. Start by searching their message archive with a string such as "primo em172".
Dale
Dale
I bought a single 158 and 172 to play with from frogloggers, then a couple brass wands. I've been looking at preamp circuits - will probably build the one at John Conover's website.
I found a recording somewhere made with a bunch of different mics including the panasonic and one of the primos and it actually wasn't much quieter than the panasonic.
Micbuilders are not really into measurements and such. They are more about “recording” audio so I wouldn’t expect to find numerical differences in frequency response, snr, distortion etc as compared to WM61 over there.
To quickly compare two capsules without a preamp you could plug them into the mic input of a good soundcard or laptop and just run some single channel speaker measurements with both to see the differences. A short well shielded cable terminating into a 3.5mm stereo plug should do it. Typically the left channel on such inputs is at +5V that can be used as supply to the mic. That’s all is needed to operate the capsules.
Although something to be careful about when using such mic inputs is to make sure all special effects or enhancements (noise cancelling, response pruning etc..) have been disabled.
To quickly compare two capsules without a preamp you could plug them into the mic input of a good soundcard or laptop and just run some single channel speaker measurements with both to see the differences. A short well shielded cable terminating into a 3.5mm stereo plug should do it. Typically the left channel on such inputs is at +5V that can be used as supply to the mic. That’s all is needed to operate the capsules.
Although something to be careful about when using such mic inputs is to make sure all special effects or enhancements (noise cancelling, response pruning etc..) have been disabled.
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