What is the best headphone adapter for the iPhone and will it affect the sound quality?
The best quality will be getting the audio signal from the dock connector other than the headphone jack.
agreed, it is world's better. My new Eclipse had nothing in it so i installed a mitsubishi dock connector and then 6 months later added an aux adapter as well. The Dock connector sounds worlds better than the compressed muted sound of the aux which also requires a doubling of the usual volume. Only obnoxious thing about the dock connector is ya can't see whats playing...idiot designers...
Why? I can see what song Im playing. But you need an external volume controller if you use the dock connection..