I have received the capsules. I have hooked up one to my EMU 0404 and while sounding, is wasn't satisfactory at all. Low volume, to much noise, no windshield. It went a bit better when phantom powered (the EMU has an on/off button), but it wasn't even near to a commercial mic. I have already ordered the parts to build Projct 93 ESP preamplifier, hope it will work.
These capsules (~$60 @) were used in the Nakamichi CM300 microphones, still highly sought after as entry level mics for concert tapers. You can get 10-12dBA noise in the right circuit, but you need to build the impedance converter because these are raw capsules. You can not use the EMU phantom power. There are some concert samples on Jan's Linear Audio site of a pair of EM-23's.
For a measurement mic you want something like the Nakamichi CP-3 capsule (don't know the Primo number or even if Primo).
I have already assembled the Linkwitz circuit which uses an opamp and the result is quite excelent! I made the mod to improve their SPL.
I will mount too the ESP circuit which uses transistors to compare how do they perform. I will mount it in an assembly and post pictures as finished.
I will mount too the ESP circuit which uses transistors to compare how do they perform. I will mount it in an assembly and post pictures as finished.
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