Obsidian 18 clamped

Watch the video for details. Box is not built for SPL, rather for daily ground pounding. The box is 6. 5 ft3 tuned to 29 Hz via a 6 aero port. Clamp meter shows actual power. 139. 9 achieved with 240 watts. 144. 4 with 1190 watts. This was after I have been beating on the driver for a while testing for the peak frequency which is 37