does anyone know where the AUX input is for the Alpine CDA9812RB? thanks

All alipne radio's w/ Ai-Net need to have a module that you plug up to the Ai-Net cable coming out the back of the radio. The module from Alpine KCA-801B will have a set of RCA's and another Ai-Net input this is how you get get the aux. input and still operate a CD Changer . If you are not interested in connecting a CD Changer or other media and you just want the RCA input look at the link below and you could save yourself $60.00!

http://www.installer.com/aux/

or the alpine module:
http://www.crutchfield.com/S-oA7gWK10WGJ/cgi-bin/prodview.asp?i=500KCA801B

:2cents: