Was your reply directed to me? If so, I apologize for responding.
No, unfortunately, I haven't got to hear an EP800. I'm sure it sounds incredible.
My listening experience has been that the DSP and low distortion of the Axiom subs is often overlooked.
I agree. All the hyperbole and measurements aside, you can amass quite a few thousand of real world opinions and side by side comparisons of the most hottest/most talked about subwoofers, thanks to the internet.
Over years, I was able to sift through all the great amount of information, and bullshit lol, to finally decide that buying a pair of M80s would be a VERY rewarding experience at a VERY competitive price. After doing the same with subwoofers now, as happy as I'm sure I would be with an EP800, I just can't in good conscience pick it over all the offerings at similar or lower prices.
You have the seaton submersive HP plus...a 4000 watt monster with the option to drive a slave unit. To my door in canada would be about 2700.
You have the offerings of SVS.
You have HSU, rythmik.
And then you have Power Sound Audio. "Tom Vodhanel and Jim Farina are known as veterans of SV Sound, Tom actually having been a co-founder and the "V" in SVS, while Jim was involved with their R&D"
The reviews from users speak for themselves. The reviews from professionals as well.
But that being said, it's just purely my opinion based of my observations. I'm in no way saying that the axiom subs aren't badass. They surely are. I just don't think they hit a great price point for me.
This is all just based of OP's original post. If it was me, and I was considering 1 pb13 ultra, or 2 ep500s, I'd strongly consider 2 PSA XV15's for $1600.
And that being said as well. Before I pull the trigger on two XV15s, I'm going to just wait around to see what offerings Axiom has up it's sleeve for subwoofers. I know they are working on something and I have a feeling it will not dissapoint