Any real difference in RCA cables quality for sub?
Right now I am using an inexpensive RCA cable I had lying around for the sub connection to the AVR. Is there any real benefit to using a more higher quality (ie more expensive)?
OP a Spdif cable works fine especially for longer runs or multiple subs. Save all the money you would spend on exotic metal conductors and fancy connectors where it can make a difference, a single ended line level interconnect.
A line level cable, analog out to pre/receiver, will allow you to hear differences in conductors, shielding, and connectors. I have repurposed four fairly expensive Spdif cables at this spot, each cable had their own individual sound characteristics. I have never heard much of a difference swapping good quality cables from pre/receiver to a powered sub.
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