The short answer is no, but "no bass" does not describe the L3000's, that was good enough for me at the time. Colin?
Do you still have it? I'm pretty sure your two weeks are up, but if not and if you want, I could bring them by again, Friday evening or something briefly. (Alexandria is pretty convenient to me from work.)
As well as any other phones that we could test any theories with. The MDR-F1 has a pretty "testing" impedance.
Anyway, I'm going to assume not, but if so, speak up quickly, I'll make sure I have them with me tomorrow.