I think you should use ir2113 instead of discrete transistor for driving mosfet to get higher efficiency and sound quality but this circuit is so great😊
One more thing is If you use higher voltage like 60-100V the output power can be 200W-300W (500W peak) without using any MOSFETs drivers!!! In the video i used only 30V so the sound is very low and around 50-60W !