Agreed. When we were up for the picnic in the summer we talked to Ian a bit about subwoofer design, specifically the complaints about the cabinet not being sufficiently stiff. Without going into details, it was clear that Ian had very good reasons for designing the cabinet the way he did, and also that there was a clear and well-thought-out design philosophy behind the high end subs.

I still think an EP400 would be a good idea, though

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8