I'd like to purchase a head unit that does not use the Ipod's DAC (i.e. doesn't use the line-out connection). I know that the Alpine IDA-X series does this, but I'm wondering whether other models in the Alpine and Pioneer lineup do the same. Which head units bypass the Ipod's DAC other than the Alpine IDA-X series?
I've been digging into this some, it seems it takes a company paying apple for the decoding necessary to get and use the digital signal out of the ipod. Might want to double check with the manufacturer before you buy if it's really important to you.