Here’s a tool that can help one properly set up their listening room and system. https://www.audiocheck.net/audiotests_ledr.php That test is also available on the Chesky Records Jazz Sampler & Audiophile Test CD Vol. 1(as well as other test CDs). Stereophile(though I’m not a fan of the mag) ran an article regarding it’s usefulness: https://www.stereophile.com/features/772/index.html They bemoan the fact that the LEDR doesn't help one test soundstage depth. The Chesky CD does have a demo, that helps one learn to listen for that too.
Value of burn/break in?
I have my first hi end audio system. I fired it up, popped in a cd, and it doesn't have the vibrant sound that I thought it might have. I have a slightly used demo power amp from a dealer, slightly used demo speakers from a dealer, but a brand new tube preamp. A friend of mine told me that I will see a huge difference in sound quality once the tube preamp breaks in. I was wondering if I should get a break in cd or just wait till normal listening does the job