Comparison of Sony PCM-D100 v Primo EM172 - Ambient Noise by quisquose published on 2016-07-19T20:30:16Z The Primo EM172 are superb low noise, high sensitivity capsules popular for making DIY microphones. I have made my own for field recordings, to use with my Sony PCM- D100 and Sony PCM-M10 recorders. The PCM-D100 provides 5.0 volts PIP which seems to be sufficient to power these capsules, but I use a 9.0 volt preamp when using with the Sony PCM-M10. I have been asked to produce a comparison of these DIY mics with the D100, so here are my simultaneous recordings: 1. First two minutes: Sony PCM-D100 with internal mics. 2. Second two minutes: Primo EM172 mics -> CA9200 preamp -> Sony PCM-M10 Both recordings made @ 24/44 format. I just placed the mics on our bedroom windowsill on a warm July evening. I think the D100 edges it, but only just.