I'm looking for a "reference" CD to flex my audio system. I want it in the hard rock/metal genre, as a basis for comparison with other CDs. So what I want is a CD which shows me what the CD format is truly capable of. After various hardware upgrades, I've played CD after CD, and come to realise how poorly, quality-wise, they actually are, and how much variation is noticeable between them. My system is decidedly mid-fi, so this could also help me identify any HW problems I may have. So suggest away! Thanks, Martin.