Thanks for the reply, but I ended up getting a SMSL SAP-II. I have an Asus DGX card in my pc so no need for a dac, and I read a review on head-fi that said the SAP-II can power the HD600 fairly well.

Can it power the HD600/HD650 sufficiently?

I found a store that had the Hd598 and after listening to them I definitely prefer them to the DT770 and HD668B. To compare them to the superlux - the senns have a wider soundstage, quiter lows and highs(not by a lot), and fantastic mids. Vocals sound amazing in them. The DT770 felt like a more...

Hey, I've narrowed down my search to the HD598 and DT770 (gonna wait till black friday before buying). Currently using the Superlux HD668B with a Xonar DGX on my pc. I've listened to the 770 but not to the 598 so if anyone has both the 598 and the 668B could compare them that would be great...