With regards to the system mentioned below, is it worth upgrading the Arcam amp and CDP mains cables to the Russ Andrews 'PowerMax Plus' mains cable? My cables at the moment are the original ones supplied for the seperates by Arcam and through the RS6's, i can hear a notable hiss from the tweeters when its dead silent in the room Would the mains cable upgrade be an overkill if i'm not upgrading with a mains conditioner as well or will the upgrade be worth while for the time being?