[Wayne A. Pflughaupt]

mra68 wrote:

I did not have this experience with my previous sub in the same location...

I’ll bet your old sub was um, kinda wimpy compared to this one?

...and am trying to ascertain if there's an issue with my sub, or if anyone has ideas to try to improve the response in my room.

You have an excellent and highly capable sub. Your problem is the same as every one else’s: the room.

As far as improving response, around here we typically recommend parametric equalization. Trust me, we’ve seen much worse response. At least yours is such that it could be equalized. Just make sure you don’t have the sub’s crossover enabled in addition to the one on the receiver. You might also try playing with the phase control.

Regards,
Wayne