DIY vs Branded

Amplifier measurement that determine amplifier quality
We all know RMS power capacity, dynamic power capacity, frequency response, current capacity, output impedence and distortion are important measures.

What else is important in an amplifier. How can we tell an amplifier is of high quality based on hard engineering measurements.

I know that auditioning is needed to detect finer points of amplifier design. But here I am looking for things that can be objectively measured.

What can we measure in NAD and Parasound that is not available in Yamaha, Denon or Onkyo.
 
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