Pavillon Sato : qu'en attendre?

[jimbee]

Douglas Self
Siegfried Linkwitz, sadly no longer with us, did listening tests where either a first-order all-pass flter, a second-order all-pass flter (both at 100 Hz), or a direct connection that could be switched into the audio path [29]. These flters have similar phase characteristics to all-pass crossovers and cause gross visible distortions of a square waveform but are in practice inaudible. He reported, “I have not found a signal for which I can hear a difference. This seems to conf rm Ohm’s Acoustic Law that we do not hear waveform distortion.”

Donc ?

 Donc pas faire de confiture entre deux aspects bien distincts, la phase relative entre voies filtrées et
la distorsion de phase générée par les filtres IIR ( distortions of a square waveform )
sur laquelle Linkwitz était un peu revenu, admettant l'audibilité du group delay aux fréquences basses
et les bénéfices de sa correction.

" You could use IIR filters to mimic the analog filters, and that would probably be my approach.
Then i would first make the amplitude response correct and then you can do an overall
phase correction of the complete system.
That's how Bruno Putzeys does it in his Grimm Audio two-way. "
( audioXpress july 2011)