The only other time I saw the repeated use of "trained ear" was from the guy who has had appx. 10 different names on AVS. He uses either "trained ear" or "if you know what to listen for" when telling people what is a good or poor loudspeakers. His method is quite clear - if one disagrees with this guy's speaker choice, one does not have a trained ear, and therefore the opinion expressed by this poor individual is "tossed out".
IT would come as no surprise to discover slownlo is none other than Nightrain. They have quite similar posting patterns.
