Originally Posted by thynyc
Hello Everybody
so I decided to change the infinity radio, to be able to dock the iphone directly in the car radio ! and enjoy music and mapquest gps guidance in the same time !!!
DUAL is the only brand I found doing that, a I got a very good price for it 50% off at Walmart, got it for $50 +tax... cheap !
The car radio looks plastic, but sounded nice enough to me in the store.
here is a picture of the back of both radio to see connectors...
Top is the DUAL / Bottom is the INFINITY
Attachment 18942
Removing the infinity was easy, with 2 nail polisher because I did not have the special tool
Attachment 18939
after I had to order the special METRA 70-9401 unit for connect with the car harness and antenna radio
(12 $ for both on ebay ...instead for $20 each in car stores...) 
Connected everything, secured with tape for the red/yellow/black wires
Attachment 18940
connected to the harness in the car : radio goes on / off properly, functions seem to work, ipod dock connect the iphone (3Gs) and charge it... but not one sound, not even a noise, in the speakers ???????? 
that is super disappointing.... 
a few questions, may you help me to answer :
is the infinity have a preamp somewhere else in the car (I have a XF roadster from 2005) ? 
do I need a pre amp / amp with this radio (does not make sense to me but...)
anything else I missed, misunderstood, misunderestimated ????
here is the link to DUAL for the specs of the radio ...
XML8100 - In-Dash AM/FM/Bluetooth® Ready Docking Station for iPod®
NS : do not have received yet the antenna adapter METRA 40-EU10 to connect antenna and check with radio...Attachment 18941
THANK YOU VERY MUCH for your help !!!! 
Is the blue wire connected? Aside from that, on mine I had to clip the mute wire on the car side wiring harness. It was never a functioning item on our car anyway.