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When using screened audio cable I always thought only one end of the screening should be connected to earth?
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Ah yes, the difference twixt screened and coaxial (impedance matched or not). Screened has the signal carrying conductors (plural, feed and return or plus and minus) and an overall screen. Coaxial has the return conductor (usually only referenced to ground*) as the outer bit, in this case the screen should, nay, must be connected at both ends.
*ground, could be chassis, common, 0V, reference or loads of other things.