I also think that the iSine products and the LCD-i4 are worth mentioning in this thread. I bought all my gear from the basshead threads and currently have: se846, sony z5, asg 2.5, 7550, xb90, Z1R and SZ2000 and drive all of them with my headstage arrow 5TX with enhanced bass boost, an iFi iCan Micro SE and an iPhone 6+.
All I can say is that the iSine20 and LCD-i4 rumble! The only thing I don't like is the isolation. The soundstage is the best I've heard so far. Those 30 mm drivers take power (3000mW) and eq like a champ, in fact, the iCan Micro SE drives them better than the arrow 5TX, and basically push them like I push the SZ 2000 (max gain, max bass boost on the amp + more eq with Neutron to raise the bass). Are they basshead ieh? I will let more experienced basshead members decide, but they definitely have the amount of subbass and midbass to satisfy me.