Posted by Sam P. on February 27, 2002 at 08:00:13

Wayne,
What better way to amuse myself while "killing time sanding" the enclosures, than to test/burn-in these new 4 Pi Pro xovers...on the jbl 4648A-8 based HT fronts. Just hooked up the coil (1.0 mH 14 ga.) in series with the 2226J woofers (no cap, OK!), HP is text book 1600 Hz. 3rd order w/ Pi pad/comp of 12 dB, feeding altec 902-8B's on 511's. Initial impression is very favorable in comparison to "normal" 600 Hz. BW's or the series 1200 Hz. 1st order I have also been using, but they both ran the HF "uncomped", just shelved 12 dB. I have some 0.8 mH 14 ga. coils to try later, for use when the 4 Pi Pro's are being tested/put in service. Sam

• 1.0 mH too much choke for dual 2226J's? - Sam P. 10:04:02 02/27/02 (8)
  • diffraction issues again... - Sam P. 14:43:23 02/27/02 (3)
    • Re: diffraction issues again... - Wayne Parham 17:25:58 02/27/02 (2)
      • measurement system DOES suk - Sam P. 06:23:20 02/28/02 (1)
        • screwed by geometry, - Sam P. 07:40:21 02/28/02 (0)
  • Multiple point sources and destructive interference - Wayne Parham 12:31:29 02/27/02 (3)
    • imaginary dip/measurement artifact - Sam P. 16:03:25 02/27/02 (2)
      • Re: imaginary dip/measurement artifact - Wayne Parham 16:45:56 02/27/02 (1)
        • Re: imaginary dip/measurement artifact - Adam 17:24:26 02/27/02 (0)