The MixPre-3 and MixPre-6 have been designed to provide flexibility in powering. Here are some recommended powering options:
Video Tiptorial on how to use channel knobs to adjust iso track levels with MixPre Series (MixPre-3 & MixPre-6) recorders.
Ground loop audio noise is something that every audio engineer experiences at some point in his working life. A combination of cabling, equipment interaction, and environmental conditions (temp, humidity etc) can cause ground loops to occur in one scenario but not another.
Video Tiptorial on how you can customize your main menu on either a PIX video recorder or a 970.
Video Tiptorial on how to calibrate your faders/pans on the 6-Series.