IPOD sound weak?
I have been using my ipod shuffle, my ipod mini, and my 5th generation 30 gb. I've never had any problems with a weak signal.
I turn the volume all the way up on the ipod so the "signal" is strong and then adujust the volume on the steering wheel or head unit.
I only have to turn it up 1/4th of the way to get super high quality sound. In fact it sounds better than the built in sirius unit that came with my car. It's even better sound than a CD.
I'm also using a cord I purchased from radio shack. If you're having trouble, it's either with your cord, or your ipod. Try cleaning out the female connectors with a blast of high pressure air, I've often had my ipod's quality decreased due to dust.
Good luck,
Eric