Peter, what I'm hearing is not bloat. I absolutely detest bloat. It's a nice, tight thump.

Bypass simply means it has a steep cliff at 100Hz. The 150Hz amp (which others are reporting they're getting) has that steep cliff at 150Hz. And maybe that cliff isn't so steep if it's been designed the same as the EP400.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated