Crap, sorry about that. My work computer's being wonky. What it was supposed to say is something along the lines of the following: So, a while back I bought a pair of recabled K701s, which had a lovely tone, but I wanted some more bass. Several headphones later, I bought the HD600s, and I've had them for about three weeks. I had a bit of a revelation last night: they sound SUSPICIOUSLY SIMILAR TO THE K701S. They sound nice, but I want more impact and rumble in the lower end. Back to the hearing board. I do have HFI-780s (which I know have sexy bass) and a Fiio E9 amplifier inbound, and they'll both be at my house when I get off work. I'm hoping the amp will give the Sennheisers a little more oomph. But what if not? Should I go for the 650s? I hear they're basically a bassier version of the 600s, but FWIR I've got this perception of them being muddy and laidback/boring. Would the E9 remedy this? Or perhaps some DT990-600s?