I believe that the graph published on the SVS website might be of the response of the older unit from a couple of years ago. I don't think they replaced the graph when they upgraded the PB12 NSD. The only reason I suggest that the response may be intentionally overdamped is that I know they did this to taylor the deep response of the 13Ultra in order to allow it to compliment the room gain which most rooms present.
i can understand the ultra 13 overdamped to 12-13hz ... but overdamping the PB12NSD that high up the frequency assuming that the enduser's room is a certain way in terms of room gain? [im not criticizing or saying they are wrong, but im trying to learn how they ended up deciding to overdamp the subwoofer, when they previously aimed for flat frequency response to the teens]
granted, SVS recommends the proper sized sub to the room and overdamping gives a lot more headroom.
but i believe low end room gain is computed by room size, room leakage, and 570.5 divided by the longest side of the room. im guessing people's room sizes are pretty random and ranging from one end of the spectrum to the other. my two rooms for example have a room gain starting at 19hz (ideal) for the 4k room and 25hz for the 3k room.
(i could listen to the PB12NSD myself, but i haven't had the time to take it out of the box yet
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