I am late to this party but thought I would comment anyway. I loved the EP400 when I tried it out. That little sub has some amazing ouput and the seet texture I love about Axiom subs. I am not so sure you really needed the extended range for an audio only system, 25 hz is more than low enough except for some pipe organ music. I am sure you will be happy for years to come with that nice little system.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70