The RB10 is just for adding an aux to an IPBus head unit when you dont have a cd changer ie just RCA -> IPBus. The RB20 is RCA -> IPBus but with thru connectors, so you could have CD player and RCA input to the same head unit.
Clear as mud now????
Squeezing MP3 technology into a Mazda MX5
Email: [email protected]