Momentary thread derail time! \:\) Catbrat... that response curve is in that particular room with the PB13. Virtually any sub would have an uneven response curve depending on the room and where it's placed. I've got an SMS-1 as well and the curve was all over the place with both the PB13 and EP500 at first.

I bought the PB13 back in the Mojo days for those of you who remember....we traded many PM's when he was comparing the PB13 to the EP600. The EP500 is an outstanding sub... but for me the PB13 was worth upgrading (admittedly, factoring in the BIG hassle of shipping it back \:\) ) I could use the EP500 as a second sub, but evening the room response a little more isn't really a factor for me since I'm usually the only listener. The bass here is very nice, thank you. \:D

So I'm torn as to keeping it or not. PM me if you'd like more info.

Epic 80 / SVS PB13 Ultra
Denon 3805 / M2200 Outlaw Monos /
Sammy 55" LED