4" crazy bass 15W speakers prototype test build bluetooth M01BT69 and SANWU TDA7498 2x100W 12v DC

4" 8ohm 15w speakers in 1/4" 5 ply maple veneer plywood 17" x 15" x 9" someone's old shipping container, 10" reflex. to make this from a piece of 2 x 4 plywood, it needs to be 15" x 15" x 9", I think.Recorded with Canon HF-R500. Song: SaneBeats - Genius amp link(don't think it's actually 2x100 watts, more like 2x 20 watts): https://www.banggood.com/TDA7498-2-Channel-2x100W-DC-832V-Digital-Stereo-Power-Amplifier-Board-468-ohm-p-1118036.html?akmClientCountry=America&cur_warehouse=CN blue tooth controller player: https://us.banggood.com/Wholesale-Warehouse-M01BT69-12V-Wireless-Bluetooth-MP3-WMA-Decoder-Board-Audio-Module-USB-TF-Radio-For-Car-wp-Usa-1194173.html?rmmds=search panasonic subwoofer (which I picked up for $8 at a thrift store, I think the enclosure is pure crap, but the 6" speaker is good, and the diaphragm is interesting): https://www.amazon.com/PANASONIC-SB-HW560-SUBWOOFER-SC-PT660-SC-PT960/dp/B0031QVOKK plywood: https://www.lowes.com/pd/1-4-in-Maple-Plywood-Application-as-2-X-4/1000351247