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Try Pkanes software. You can construct any distortion profile you want. Do one clean, do one dirty, and measure the level difference.I know I can't ignore IMD. What else can I use to illustrate an approximation?
Also, Amir used that to simulate real music playback. What else can I use to illustrate that when bass is loud, high distortion amp likely to contribute to extra db in the highs?
And why do you keep saying masking issue? Our hearing sensitivity in the highs are much better than the bass, right? Even bass is at 90db, we can hear 1200hz at 65db just fine. If the noise at 1200hz is at 70db, then I am sure I can sense 5+dB increase in 1200hz even when bass are in 90db.
Distort audibility tester | Distort documentation
distortaudio.org