I can see how that would be viable but my primary interest is using the headphones for movies and the dt990's excel at this whereas a fear the hd650 would fall a little flat, bass wise.
Loudness is more than fine, too loud if anything which is why I was just making sure I didn't have it backwards.
I'm wondering if maybe a vali2 would be better. Budget isn't really an issue but I don't really listen to music enough to spend a lot - I just wanted to experience the tube sound. I find the mids of my hp200 a little harsh and the little dot mellows them out nicely. Saying that I find the mids of my dt990 to be a bit too recessed already.
My ideal sound would be the bass and highs of the dt990's (yes, I'm one of them - I find mids to be more harsh then highs) with the tubifed mids of the HP200, can't have it all I guess lol