Picked up a NAD 521BEE as a demo unit from the local hifi store for $300. I've heard this unit before on a very similiar system and was impressed for the value but when I got home I noticed mine was noticeably louder. It was a scratching sound which was obviously coming from the disc. Is this normal with some NAD components for them to be quite vocal? It seems to quiet down once the disc gets to full revolutions but it's still detectable and quite unpleasent