If you want to avoid electronic intervention, you are probably limited to playing with speaker and listening position and/or helmholtz resonators. I have 5 helmholtz resonators in my room, custom designed for two different low frequency absorption areas. Rives may also be able to help guide you toward these or other passive solutions. I would certainly first try playing with listener and then speaker positioning if it is possible in your setting. Just mark your present locations, as you may create more problems than you solve. I have found changing distance from speakers by a matter of inches can alter the amplitude of a bass frequency tremendously. The same can be said for speaker positioning. These methods would obviously not change the total bass energy in your room, but would alter it at your listening position. In my room (almost 20x30) I have found that placing woffers closer to the wall, and closer together, increases bass in the 16-50hz range while reducing nodes in the 60hz area. I have found this same effect with many speaker systems, including dipoles. For better or worse, all of my systems have included separate subs and allowed for great experimentation. Best of luck.
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