Look into the Velleman K8022 (the K designates the kit version) passive preamp. Has a mini keychain RF remote, motor controlled volume control, two stereo line level RCA inputs and one RCA output. Minimallistic, high quality and cheap, cheap, cheap. I am not sure if they still offer it though. When I bought mine they offered in kit form (really simple to build) and a built version. I did have to wait several months for it to arrive from Belgium because the dealer in Canada kept selling out. I hope they still make this unit.