Microphones and Phase

[ugly woofer]

Just get the cross spectrum mic.

[1100xxben]

I prefer to use an analog microphone (non-USB) as I make 2-channel measurements. This also allows me to use higher quality microphones and preamps.

The other reason I prefer to use an analog microphone is because it is not uncommon for me to use a 50 ft XLR cable so that I can be as far as possible from the measurement. I've even set up and used 200 ft of microphone cable before. This is especially important in ground plane measurements. I've never had much luck with USB cables over 10-15 ft.