Hello,
Ryan, the CEO of Ayre explained it to me. He said the input or channel gets burned in with a sound signature. By using track one or seven which are sweeps. This removes the burnt in sound signature. It actually works. The three main people at Ayre do this once a week. Also, great if you changed out equipment like if you were demoing a DAC or bought a new cart or phono stage. You just run your CD player with this disc through that input. You can order it from Ayre or if you are in the Chicagoland area the local Ayre dealer which is Holm Audio or:
holmaudio.com
They had these discs in stock when I was at the Ayre, Nordost, KEF event at the store at the beginning of the December.