Epik is another ID company with great product and service from what I have heard. They are on the same scale as Elemental Designs. Many times you see eD, Epik, SVS, Hsu mentioned as the best bang for the buck subs out there.
Looking at the specs and the flatness of the FR, I would say there isn't much out there right now that is close to the performance for that price, except maybe the MFW-15. The EP350 or EP500 would also be in the same league if they had better low end extension, if the specs for the Sentinel are accurate at ~18hz.
The SVS PB12-nsd is about the same low FR and price but the graphs I have seen are not that flat. I wonder how the dip from the mid 20hz to mid 50hz range will play out, possibly manifest itself as that thump I disliked about the PB12-nsd.
Please let us know your impressions of the Sentinel.
