Posted by dbeardsl on April 04, 2002 at 12:34:43

Has anybody ever done some calculations on port air speed for some of the Pi Models? I just put the specs into a program called WinISD (a lot like boxplot). I gave me a Mach of .34 for Theater series Four Pi.

I have some large 3 ways which I just dropped the JBL M252-8B into. the port on this is rated at mach .24 and 32hz. When I play any kind of sine wave below 50 hz or so, the port is hideously wooshy, you can't hear it that much in normal music, though it's rather loud on some R&B.

The other PI models, like you said, are smaller cabinets with bigger ports, so it's not really an issue.

Has anybody tried a different port configuration, but with the same tuning?

• Re: Port air speed.IS BASED ON MAX POWER ON ISD - mhammill 17:54:46 04/04/02 (0)
• Re: Port air speed. - Wayne Parham 15:55:42 04/04/02 (3)
  • we don't need no stinking subject. - dbeardsl 00:07:01 04/05/02 (2)
    • fanning air vs. imparting a compression wave - Sam P. 11:05:24 04/05/02 (0)
    • 20Hz High pass filter - Wayne Parham 01:10:38 04/05/02 (0)
• try to avoid operation below Fs - Sam P. 13:09:51 04/04/02 (0)