I bought an XS3 over a month ago to discover PRAT. I'm still looking

[catswhiskers]

It’s been discussed before, does this help?

Good Sound. How Much Do I Need To Spend?

Possibly what ever you want it to be? I recall walking into a demo at a Bristol show, where as I turned to walk out because of the (to me) excessive one note bass, screechy treble, I had to skirt round two people, one saying “Wow, great PRaT.” As IB says, there is no definition. The closest I have found is here PRaT: Audio System Timing In Context | The Ear if @Richard.Dane allows the link.