Running military grade sub bass system its about 1000lbs and it doesn't crack concrete but it can bend the steel door to room when running tests. Since I know a bit amount about material science I would say expansion contraction due to thermal stress or earth movement most likely cracked the concrete foundation. Infrasound is less damaging to hearing since it is mostly conducted by the human body it can damage eyes by retina detachment or may cause other issues our human whole body resonance is from 2-10hz the human diaphragm about 40-60hz eyes about 16hz.
Best subwoofer below 40Hz for Magnepan .7?
The title says it all! I want subwoofer bass below Magnepan's limit of 40 Hz. Magnepan will not recommend any but their own model, which does not extend beyond 40 Hz and are not true subwoofers. What subwoofers will work with my .7s? Thanks for the personal and meaty responses on this forum!