I currently have a pair of Beyerdynamic DT880 Pro headphones (2005 model, 250 ohm). While I love the huge soundstage and crisp highs, the mids are a bit recessed and more importantly, they really lack low bass compared to even my $69 Grado SR-60's. At first I kept thinking it could be the S.E.X. amp output impedance, or the Quickie, or my DAC - but I've now ruled all of the usual suspects out, leaving the headphones as the culprit. In fact, I think my Klipsch Heresy III's sometimes have better bass than these things, and that's sad.
I've heard quite a few BH members mention Sennheisers as being great headphones for the S.E.X. amp. So, here's a question or two: a) 650 vs 600? b) Compared to the Beyers, would I gain warmer mids and better bass, without getting too "murky," and c) is there any merit to that whole "veil" stereotype, esp. with a clean and revealing-sounding amp like the enhanced S.E.X.? Nobody in my area sells these, so I'd have to buy them without having heard them first. Thus, I'm interested in what people have to say about these cans.
I have also thought about AKG 702's, but I think they would just be more of the things I dislike about the Beyers (i.e., thin, sharp, cold, too lightweight below 100Hz). The HD800's are a bit too pricey, and I've grown to really dislike my Grados. So, it's going to be the 600's or 650's, unless somebody can suggest something better. Music tastes are mostly jazz and classic rock.
Thanks!