Awesome unit mint condition Can run all alpine AI-net equipment through this unit using stock HU or aftermarket alpine. I had it hooked up to my stock system through an LOC. Totally cleaned ther signal to Alpine quality, Paid $400 is 02 bought brand new. Has digital optical input, Ainet input from acessory unit. can contorl subs from remote face, front rear and sub RCA outputs, AI-net RCA inputs, 5.1 surround sound DSP, EQ and parametic eq. Can adjust for timecorrection etc. 4V pre-amp out puts for awesom sound. Still have $599 sticker on box. Have all papers instructions, connections etc.