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This is a basic test of the intro to Edge of Tomorrow (with Tom Cruise) with consecutive sine waves at 30Hz, 25Hz, 20Hz, 15Hz and 10Hz. It really shakes the house. This is just a sample of what the driver excursion looks like and port activity. I used a paper napkin and a small piece of cloth in the 2nd and 3rd segments to show the port velocity and air movement. I built this cabinet to sit behind the couch for bass during movies, music and games. It is all DIY with wood and tools from Home Depot and parts from Parts Express. The parts I used are: iNuke6000DSP amplifier, Dayton Audio UM18-22 subwoofer and two Dayton Audio PA380 woofers. The UM18-22 is in a 11cu ft ported cabinet tuned to 16.5Hz and the PA380s are in 2.25 cubic foot ported cabinets tuned to about 40Hz.