With tests from teh creator. Shouldn't stereophile have a complete set of these tests disc to run the players through lab tests..let's see how those $45K or $15K or $23K players do, are they worth anywhere near what is asked for in pricing? Or will a $1,000 unit work as well. MEASUREMENTS, what a concept, JA, you would love a set of all these wouldn't ya? http://www.opticalstorage.philips.com/about/products/testdiscs/catalogue/Section-13824/Index.html