My week old KV28LS35 has what I thought was "just" a somewhat noisier than average HT whistle, and I hoped I'd get used to it. Well, I'm not getting used to it... it's like having tinnitus while watching TV! I thought it might just be me being oversensitive, but this morning I realised this whistle's spilling over into the sound output. Basically when I wear decent headphones (which partially masks out the external whistle), turn the volume right down, and toggle the mute button, it's clear there's a fixed background level of whistle (between 12 and 15KHz) in the sound output. This component to the overall whistle disappears when the sound's muted, and doesn't get louder when I turn up the volume. Obviously turning up the volume makes the whistle less obvious, but it's very hard for me to ignore nonetheless. The question is, does this sound like a real fault, or does it mean I'm Mr Freaky Ears? My fear at the moment is that the supplier will send an ancient engineer with less sensitive hearing who'll just shrug and say it's fine. Of course I can just play the stroppy git and get it swapped, but if the problems' my ears, not the set, then I could be playing this swapping game for a long time. Any thoughts before I start embarrassing myself on the phone to Empiredirect?