i am selling my base amp. my pdx 400 is finally done at the shop and i need funds to help pay for the repairs. this amp is very unique. it has a built in power supply, you can see the pos and neg posts on the rear. i believe it is rated at 18v? it has 2 motorola pills, will do about 350w max. has all blue leds and a blue lighted fan. $250, shipped. it's heavy.