AVS Forum Special Member
Join Date: Dec 2007
Location: Southern California
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For speaker cables, you do not want to ground either end.
Doing so can make the amplifier unstable and it can oscillate at ultrasonic frequencies and overheat.
An audio line-level (input) signal should not be run more than 10 feet with an unbalanced (coaxial) cable, and should also not be grounded except at the amplifier end.
Long runs must use BALANCED circuits at both ends and the appropriate BALANCED cables with XLR connections.
You can't do that with an Ipod, so forget it.