Burn-In Necessary on New CD Player? I just purchased an Onkyo DX-7555 CDP and should have it in my clutches within 4 to 5 days. I've read a lot of comments suggesting that new CDPs sound better after an initial burn-in period. This does not intuitively make sense to me and I'm wondering if some of you can enlighten me. Is this a bunch of bunk, or do they really perform better after some initial use? If some of you think new CDPs really do require a burn-in period for optimal performance, can you explain why and how this is true? Thanks.