Try an HD-650. With my WA3 and the right tubes, I wouldn't want more bass than what is provided with that combo, speaking personally. I've read the bass response is significantly increased over the HD-600 and, as you know, the Woo OTLs are killer with the HD-650.
Thx for that....I demo'd the 600s vs. 650s back in the day before I chose the 600s.TBH,while I find the 600s to be a good bang for the buck headphone,the only time I use mine are for gaming.
I really enjoy soundstage and placement on the T1s and my 600s dont offer much,if any of that,and the only diff between 600s vs 650s is bass.
There has to be a set of cans that work well with the WA2 that do both bass and soundstage well.....Buehler?