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Has anyone had any success with a sub floor?

I had a 240 watt klipsch sub in my upstairs living room (very large with 18” ceiling) that would shake the couch and make my guests smile on movie night. I recently finished a 4000 + cubic foot theater and every one mentions the missing bass. I went through some of the early learning curve with members help but I’m still at a loss. I purchased 2 klipsch 15” SW- 115 subs and upgraded to a Denon 4520ci AVR. Location and calibration can be ruled out .. I’m pretty confident it’s not a null.

I know the next suggestions would be subs with more output. When I turn them up to reference levels there is enough output to shake the main floor of the house. The living room lamp shades shake and the kitchen microwave door will buzz. It feels like a freight train is going by when I stand on the floor above the theater room. My guests would be uncomfortable at this volume but it’s still not enough to get that feel like I get on the main floor.

Please tell me if I’m wrong but I think due to the concrete floor in the theater I’m left with two options. Butt kickers or putting in a sub floor to disconnect the theater floor from the concrete similar to the main floor. Because of the amount of work involved I thought I would ask if anyone has had any success with this route and what kind of sub floor construction would be best.