You lazy B
The only way to know for sure is to try them. If you've got them lying around why not give them a try. I've heard people say there are picture and sound benefits when used with dvd players and plasmas. I recently bought a audusa mains cable for my naim cdp I did notice a marginal improvement over the shipped one but I didn't expect miracles.
Seems a shame not to use them and they're hardly cheap so I'd want to get my monies worth.
If they gave you improvements on your hifi equipment I can't see any reasons why that wouldn't apply to your av kit

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