Just spent several hours using a recently purchased Umik-1, mini dsp and REW with a MAC computer. Kind of fun playing with the semi auto EQ between the Minidsp and REW. It was also interesting to see exactly what the various calibration curves (flat and natural) from Yamaha YPAO were doing. I liked the ability to work with my two subs delays individually. I was also able to make a separate EQ curve, delay and crossovers for the bass shakers. My ears say it sounds good with the changes but it could be a result of my invested time and money. :) One plus is it was a good opportunity to exercise my brain learning the software and getting the setup in place. I had used REW many years ago with the rat shack meter and the loop back calibration approach. It was much easier this time with the calibrated UMik-1 and an HDMI cable from the MAC to the receiver.