Is there any way to increase the gain (volume) on the AUX input on a GS350 '09 with Mark Levinson and nav systems? I'm hoping there is some way the head unit can be tweaked (as opposed to adding some type of external line amplifier). When I hook up my iPhone through the 30-pin connector to the AUX input in the console, the volume level is very low, and I have to crank up the car stereo volume. Of course, the volume setting on the iPhone is bypassed when using the dock connector, so I can't boost the volume on the iPhone.
Thanks!
