I sold my 701's a while back but I still own the 601's (which I ended up preferring, it's more fun to listen with). I might give it a shot with the Metrum Quad + SA-31 but I don't have high expectations. I didn't listen to these since I got the HE-4s, a year and 2 months ago... I didn't listen to the 4's since I got the 500s, 6 months ago and I'm receiving the 400s on monday (for the fun factor). Going back to dynamics headphone will certainly hurt but if you want some inputs I could make an effort Any particular aspect of the sound you want me to focus on?