I love this quote. XD
The HE400 is what I consider the most well rounded can I've ever owned. I did call it the PC360 on steroids. However, that bass can and will hit fantastically if something asks for it. It will be nice and balanced 90% of the time, but put something bassy and OMGYES. Not DT990 or Pro 900 bass, but a very satisfying amount the vast majority of the time.
I think if a person finds the bass on a HE-400 insufficient, he/she should just game with a Sony XB. And not bother with any MixAmp or equivalent. And downres all music to 320 kbps max. And sell all amps.