After trying a SVS PB12-NSD and finally sending it back after trying just about everything (except different placement as the sheer size limited to one spot in my room) I ended up spending the money to try the Rythmik F12.
Brian was extremely accommodating and answered all of my questions prior to letting me pickup a black F12.
Although I received the sub yeserday, I fought the urge to tweak the setup until today as my fiance can't stand the Audyssey "blips", especially when you need to do it six times! LOL
So today I ran the Audyssey calibration and then set levels to 75dB using my trusty Radio Shack SPL meter and a stand. Once everything was ready, I popped in the Transformers: Rise of the Fallen Blu-ray which I had used (seemingly) a million times when tweaking around the SVS sub.
Let me just say...my first demo with the Rythmik F12 was nothing short of a religious experience! All the "missing" bass I was trying to find with the SVS was there! The detail with the helicopter blades, the higher-range in explosions, etc. After minor tweaking with the incredible amount of settings on the back of the sub, I have everything set for a showing of the Avatar Blu-ray tonight with friends. (I am one of the only people who has still never seen this movie)
I have a new Pioneer VSX-1020 coming in Monday which will replace the Denon AVR-1909 I was using. Once that's setup, I'll be looking forward to really dialing-in my setup.
This post isn't to knock the SVS. However, in my (admittedly awful) room dimensions and with my current setup, the Rythmik was about as dramatic an improvement as I could have hoped for.
Thanks again Brian!