OK, I believe the OP want's some measured results, so here goes:
Emotiva XPA-1 Monoblock Power Amplifier
THD spectrum of a 1 kHz sine wave at 20V p-p output amplitude.
Emotiva XPA-1 THD spectrum of a 10 kHz sine wave at 20V p-p output amplitude.
Intermodulation products were over 60 dB down from the fundamental tones at 1 kHz and 500 Hz, which is very good performance. Here is the Emotiva XPA-1 intermodulation spectrum of a 500 Hz and 1 kHz sine wave each at 20V p-p output amplitude.
Frequency response was flat as a board from 20 Hz to 48 kHz, the limit of the SpectraPlus software. The slight linear rise towards higher frequency is the response of the sound card input, not the amplifier itself. The same slope is present running the UA-101 output directly into the input. Shown below is the Emotiva XPA-1 frequency response at -30 dBV RMS level into an 8 Ohm load.
These results are pretty darn good for the money, IMO