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John, your concern has been know for nearly 25 years...

The name is Phase intermodulation Distorsion (measured in rms time_unit).
The testbench is the traditional SMPTE-IM, (combination 60 & 6,000Hz, ratio 4:1) but you measure phase modulation of the carrier instead of amplitude modulation.

Very good amps measure in the 0.1nSrms range, bad up to several ...uSrms !!

The later could all but blurr the imaging according to your values.

(the reference paper is RRCordell, "Phase Intermodulation Distorsion- Intrumentation & Measurement" J-AES, Vol31,No.3, March 83, you can get it here.


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