Jack, after reviewing all posts, I DID say ultra I STAND CORRECTED, That was the sub that I have had on my mind as far as comparisons, I do not think Axiom said "ultra" but I very much Know SVS, HSU, my apology, It would have been easier to go back and delete that post of a few minutes ago, but I was mistakened on the "ultra" statement, nobodys fault but mine on that one. Adding to the problem, I hope not, the principal is the same, again, sorry. Jon

Sunfire amps & processor Sammy 50" Crown amp 2-SVS SS Maple Ultras, Axiom 60s,22s,150cc, QS8s