Filtering always alters timbre despite the goal of subjective transparency

Evidence

In these cases the ideal would be to filter the signal in a way that miniĀ­ mized any unwanted subjective effect on the desired signal. Ideally, in these cases the timbre of the sound being processed should not change after filĀ­ tering, but in practice there will be some effects. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2390

Categorization

  • QUESTION: Worth chasing: which filter parameters and slopes buy the most perceptual transparency for the least phase or timbral cost?