after 30 hours of break-in, the sub-bass seriously opened up, and jeeez are these cans good.
the 662 F are my less expensive cans and they sound better than any of my 15 other cans, except... my Q701 of course.
the sound quality is outstanding (details, neutrality, clarity, bass presence and impact, PRaT), and i'm wondering how the superlux dudes did that?
the bass quantify and quality is near perfect and digs deep but the signature is still very neutral. the upper lows have punch and are clean without affecting the mids (most so-called neutral cans have relatively weak bass - in quantity - to preserve the mids). and the soundstage is wiiide for closed cans.
buy them, they are no-brainers. similar signature than my (now sold) dt-880-600 but way better sounding (bass and mids).
bottom-line: the 662F are neutral studio headphones + fun allrounders for enjoying music without analyzing it. best of both worlds? i thought that flat and fun were incompatible...
the only problem is the heat and clamping force (velour pads should fix that though?).