What’s the likelihood that measurements might be contaminated by a mic preamp, like this one that is designed to “add warmth to condenser microphones” ?
BEHRINGER: MIC100

I’ve been trying to figure out what’s causing some mysterious 2 millisec / 70cm / 28 inch resonances in my measurements. I’m pretty sure they’re not from room reflections.

Is it necessary to have a mic preamp between a condenser mic (ECM8000) and a sound card (Echo Indigo I/O), or would a plain 48-volt phantom power supply be enough ?

http://img819.imageshack.us/img819/2...03millisec.png

http://img444.imageshack.us/img444/4...isecnormal.png