What do you need to know? You know what you like;..right? Learning the technical stuff is fun but if you listen to music thats all you really need to know. Your ears know what sounds good. Training may help you recognise phenomena but it will never improve your hearing. The ear is not a muscle that can be strengthened through excersize. Thats my personal opinion. Although I still enjoy the tech stuff. And I agree concerning personal attacks; I would rather argue politics and attack a party and leave the personal stuff out. But man; these audiophiles; they make political discussion look tame when they disagree.