I had sort of an "Oh crap" moment when I put on the K712 after not using them for a full day.
One song sounded really really dark and like someone put a blanket over the trebly sounds. Sort of muffled.
So I switched back to the modded Q701 and it sounded basically the same. You could tell the K712 was very very slightly warmer/darker. This was so subtle it's not even really pointing out. The song sounds the same.
It was a Jpop song with female vocals that sounds like it has like zero soundstage in the recording and it's 320kbps.
I really think both are sort of chameleon like and can change their sound based on the recording. It's pretty impressive. Sometimes I always wondered if people are describing stuff in reviews (not for the K712) that's not caused by the headphone itself, but the headphone (and gear) is just being dead accurate. I always felt my Q701 could randomly change from sounding almost like an HD-650 to an AD700 based on the recording. OK, the AD700 one is extremely rare but some songs sound like they have all the bass and warmth sucked out of them. Other songs sound very very dark and muffled. Some ambient Electronica music is especially bad. When I switch recordings I can go from way too much treble to nowhere near enough. Other times it's distant sounding vocals or vocals that sound too forward. Both male and female. So confusing. Why can't all recordings be good?
If I was in a recording studio I'd love to compare both and see which is more accurate to my recordings. Probably would be best to test this with materials that are slightly warm sounding or bassy.
BTW I don't find the K712 to add bass and warmth where it shouldn't be. Perhaps a tiny amount of warmth, but barely audible. I like this. Sometimes it sounds smoother than the modded Q701 and other times not so much...
Edited by tdockweiler - 10/22/13 at 11:27am