I use a Headway EDB-2 which has a phase reverse switch which allows me to reverse Channel 1 or Channel 2 or neither (off position). The manual talks about getting two inputs to be 'in phase' with each other and that makes sense to me. What I don't understand is why, when I'm running only 1 channel, reversing the phase makes a significant change in the tone. For example, I'm running my Ischell mic into channel 2 using the phantom power. Having the phase switch 'off' results in a 'fuller or fatter' tone which I think is often what you might want. However, when I reverse the phase switch on channel 2 the sound I get is actually much more 'natural and acoustic'. It's not at all thin sounding. It's still very full and rich but it just has more clarity. I don't think this is explained by putting the speaker 'in phase' with the acoustic instrument. It just seems that the sound coming out of the speaker sounds significantly better to me when the phase is reversed. Can someone explain this to me? (Curious Gear Junkie would really like to know).