I cant wait to send in my MD for the upgrade. Going to do a full review comparing the AD with a magni, sx650 and through the speaker taps on the 650. Give people an idea about power and scalability. Really excited to see what they can do through the taps. Jump from magni to 650 is noticeable and the magni hits a wall as far as power goes. Once i get past 1oclock on it the MDs dont really get much louder.