orphean for 220hz high-pass not too small ? (Orphean)
Hi Bert
to cross at 300hz, is the Orphean Horn not too small ?
here the comment from Jean Michel LeCleac'h :
- in order to operate the horn inside a frequency range for which the acoustical impedance of the horn is mainly resistive (and not reactive in order to avoid phase distortion) we have to use a high pass frequency an octave minimum above the acoustical cut-off frequency of the horn. This means that for a tractrix horn used above 500Hz, the acoustical cut-off should be 250Hz. If we consider a complete tractrix horn opening at 180 degrees this means a horn having a 433 millimeters diameter.
Please notice: classical empirical formulas giving relations between cut-off frequency and diameter give a minimum diameter. IMHO thet can be useful in the pro domain where a smaller volume is desired. In the hifi domain they should be avoided.
That meens, to have a high-pass frequency at 300hz, there should be used a 150hz horn with 68cm diameter. If high pass it is 220hz,as you state for the orphean, the horn should have 88cm diameter optimal, no ?
rds Angelo
Complete thread:
- orphean for 220hz high-pass not too small ? - angeloitacare, 2007-06-04, 06:29
- orphean for 220hz high-pass not too small ? - Bert, 2007-06-04, 09:13
- orphean for 220hz high-pass not too small ? - PeterSt., 2007-06-04, 09:28
- orphean for 220hz high-pass not too small ? - angeloitacare, 2007-06-04, 12:04
- orphean for 220hz high-pass not too small ? - Bert, 2007-06-04, 12:15
- orphean for 220hz high-pass not too small ? - Ivo, 2007-06-04, 13:46
- orphean for 220hz high-pass not too small ? - angeloitacare, 2007-06-04, 14:34
- orphean for 220hz high-pass not too small ? - Don Reid, 2007-06-04, 17:13
- orphean for 220hz high-pass not too small ? - angeloitacare, 2007-06-04, 17:40
- orphean for 220hz high-pass not too small ? - robmatthew, 2007-06-06, 15:55
- orphean for 220hz high-pass not too small ? - angeloitacare, 2007-06-06, 17:36
- orphean for 220hz high-pass not too small ? - robmatthew, 2007-06-06, 23:10
- orphean for 220hz high-pass not too small ? - angeloitacare, 2007-06-06, 17:36
- orphean for 220hz high-pass not too small ? - robmatthew, 2007-06-06, 15:55
- orphean for 220hz high-pass not too small ? - angeloitacare, 2007-06-04, 17:40
- orphean for 220hz high-pass not too small ? - angeloitacare, 2007-06-04, 12:04
- Tweak - PeterSt., 2007-06-25, 01:44
- the pic does not give any clue (nt*) - angeloitacare, 2007-06-27, 01:34