Patrick Snyder's Bass Reflex Equalizer - diyAudio
 Patrick Snyder's Bass Reflex Equalizer
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 18th April 2009, 05:04 PM #1 diyAudio Member   Join Date: Jan 2006 Location: Missouri City, Texas Patrick Snyder's Bass Reflex Equalizer Does anyone have a copy of Patrick Snyder's (SpeakerLab fame) Bass Reflex Equalizer paper, where it shows the schematic of the equalizer? TIA bwhitejr
 21st April 2009, 03:38 AM #2 diyAudio Member     Join Date: Feb 2001 Location: USA It's just a 2nd order filter with a Q=2 and an input buffer. __________________ Candidates for the Darwin Award should not read this author.
 21st April 2009, 10:55 AM #3 diyAudio Member   Join Date: Jan 2006 Location: Missouri City, Texas Patrick Snyder's Bass Reflex Equalizer Thanks for the response. Would anyone happen to have the schematic or the paper itself? I would appreciate it very much. bwhitejr
 21st April 2009, 12:25 PM #4 diyAudio Member     Join Date: Feb 2001 Location: USA http://sound.westhost.com/software/esp-lr13.exe Check 12dB, check High Pass, enter cap value, enter frequency. This gives the resistor value for a Q=0.5 (LR) For a Q=2 (6dB boost): Take resistor value times 4 for the resistor going to ground. Take the resistor value and divide by 4 for the feedback resistor. Example: 32hz 100nF 49.74K (Q=0.5) *4=198.96K (Q=2) /4=12.435K (Q=2) For the higher value resistor, pick the next highest standard value. For the lower value resistor, pick the next lowest standard value. The square-root of the product of the higher and lower value resistors should be equal to the original Q=0.5 calculated value. __________________ Candidates for the Darwin Award should not read this author.
 21st April 2009, 04:58 PM #5 diyAudio Member     Join Date: Aug 2005 I don't have the orginal paper anymore (or its buried) here's the scheme from Weems - not sure how well the adjustable feature works - seems like DJK commented heres the page with parts list
 22nd April 2009, 12:03 AM #6 diyAudio Member   Join Date: Jan 2006 Location: Missouri City, Texas Patrick Snyder's Bass Reflex Equalizer Freddi, Thank you very much. That is exactly what I needed. I have the paper somewhere, but couldn't find it. Every now and then the old stuff is valuable. Again many thanks. bwhitejr
 30th April 2009, 07:39 AM #7 diyAudio Member   Join Date: May 2004 Location: Vancouver Island I sort of remember an article in Audio magazine with a similar circuit. Probably the same as: "W. M. Leach, Jr., "A Generalized Active Equalizer for Closed-Box Loudspeaker Systems," Journal of the Audio Engineering Society, vol. 38, no. 3, March 1990." Here's a sub project with a similar equalizer, including layouts: http://home20.inet.tele.dk/audio/mini-sub/mini-sub.htm

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