662F is closed but has a huge soundstage. Imo, it is similar to my Beyer DT-150's (with pleather pads) soundstage, which is known to be exceptional for a closed hp. 662F has a better soundstage imo than my DT-150 with velour pads (see picture).
Never heard the 662 or 662B though.
I should receive my 681 EVO next week. I will post some impressions.
from the Superlux site:
681 EVO has a different tuning/signature than the regular 681 (I should receive mine next week...)
quote: "the new HD681 EVO upgraded version has a completely new, more slender shape and an improved smoother, more neutral, treble tone."
662 EVO is supposed to sounds the same as its predecessor, but who knows... Imo, chances are high that a completely new appearance will affect the signature...?
quote: "Inheriting the sound profile of its predecessor while optimizing its appearance, the HD662 EVO meets the expectations of... (blablabla)"
But I don't know when they will be available. Anyone?