Up for sale is a Z-Systems RDP-1 digital preamp in mint condition. I cannot find a single flaw anywhere on this unit. It comes with the original remote and a copy of manual. I dont have the original box, but I can pack it for safe shipping. This unit works perfect, and has never been serviced that I know of. I am the second owner. I will include free shipping at my asking price. No paypal or international shipping. Any questions just ask. I check my emails daily. thanks!