PRAT is heavily influenced by speakers, dacs, the recording themselves, etc. Perceptively, I'm not sure how anyone's able to boil it down to an amp in a listening test.
On the same note, the Yamaha A-S3200 is a great amp, going back 15 yeas now along with its predecessor 3100. The minute you pop the hood and look at it, the relative inferiority of most other amps in price class will become apparent.