I have connected my IPod classic to an amplifier using a RCA cable but since then I am struggling with the sound quality. I have to keep the volume on the max on my IPod and almost 75% on the amplifier to get some good sound. On the other hand when I play the same music from an USB of Phillips DVD player through the same amplifier the sound quality increases remarkably. Is there any way to improve its sound quality while playing through my IPod? Does IPod dock helps to improve the sound quality in this case? Please help.