im not sure,but i paid $600 for this amp.im still new to this audio stuff.the guy said this is the best amp i can buy n i assume that it was cuz i paid so **** much.it powers my 2 12" w6v2 np,but its time for me to go smaller.i dont want all that bass anymore.either way....$400 should be an awesome deal for this amp.ive done some research myself n this amp is priced very high on the market.if anyone is intrested in this high end quality amp, plz let me know.thx.