01/04/2017-23:00:28
RE: Filtrages pour ( quelques ) pavillons
From an interview given by Mr. Kinoshita to "Studio Sound" in 1987:
"the HF horn has a 270º phase difference at the cut-off frequency" (see attachment, page 2, second column).
270º = 6 x 45º = 6th order acoustic high-pass.
Once more, this is true for many hypex horns with a cut-off of approx. 300Hz (which also happens to be roughly the same internal resonance frequency of may traditional compression drivers such as the JBL 244x and TAD 400x).
Marco
"the HF horn has a 270º phase difference at the cut-off frequency" (see attachment, page 2, second column).
270º = 6 x 45º = 6th order acoustic high-pass.
Once more, this is true for many hypex horns with a cut-off of approx. 300Hz (which also happens to be roughly the same internal resonance frequency of may traditional compression drivers such as the JBL 244x and TAD 400x).
Marco