Hi jpwarren58...
After extensive search for a smaller dedicated studio deep bass solution under 80Hz, I discovered a larger, single, Direct Servo as my solution, replacing the two sealed subs I had been using. My Rythmic L12 was $629 delivered and FULLY delivers at such a reasonable price. Testing shows the Rythmic loading the room at 20Hz, which I never thought possible. Don't be fooled by the price. I was considering one of the higher end brands, but was well advised by experienced friends, near and far. Tuneful, solid deep bass does not have to be costly and so contributes to all the frequencies in its execution.
Best, jpwarren58.
(bold print for old eyes) More Peace Pin