This subwoofer is incredible. Cleanest bass I've ever heard!!! Sounds like 2 subs. Subwoofer is the FOCAL kx 33 13" subwoofer.($1300new) Focal is an incredible brand. 800watt sub that easily beats the jl w7 in my opinion . I also have 1200.1 Viper amp that EASILY pushes this sub at 3/8 gain. This amp is high quality. The box is custom built at car toys. OPEN TO TRADES.