A sealed subwoofer should not drop off like this http://www.audioholics.com/reviews/speak...view_fullscreen http://www.audioholics.com/reviews/speak...view_fullscreen
I'd like someone from Axiom to comment if its a "brickwall" HPF
What really got me upset was that my opinion doesn't matter even though I own and Axiom subwoofer (if you can call it that)
M22s, M2s, VP150. Check out my posts on AVS where I battled it out for year recommending Axioms to people (except their subwoofers) Which I still like the M22s and M2s, and still have recently recommended them on AVS.
Find me a thread where Axiom subwoofers have been recommended in the last few years, there isn't one, nobody wants them cause they are so dated compared to the competition and are priced at a premium at that. Looking at measurements of the PB12 NSD and it kills the EP600 under 40hrz. $769 VS $1860. The $400 Emo sealed sub kills the EP400 and does it at 60-70% less. $1100+ for the EP400 with performance like that graph, and its a hollow box ZERO bracing just a 3/4" mdf a 8" woofer and an amp nothing special.
The OP posted asking about subwoofers and actually thought the EP600 and 800 was in the same league as the SubM and Ultra will there not in the same league the EP600 can barely compete with SVS and other brands lower end models. If your going to spend the $2K on an Axiom subwoofer you should know your buying an outdated underperforming, under built subwoofer.