Linkwitz Transform question

mikee55 · 19th January 2007, 06:38 PM

Hi all, can someone explain why the Linkwitz Transform doesn't use a lowpass filter? There is no mention on Rod Elliott's Project to use a crossover.

I'm just curious before I repair mine.I used a lowpass filter in-between mixer and L. Transform. Anybody else use it this way?

Cheers mikee55

Dag · 19th January 2007, 07:14 PM

A closed box speaker behaves as a 2nd order HP filter at low frequencies.
You might think of the Linkwitz Transform as a "thing" that first makes the FR flat and then makes a new 2nd order HP filter at (almost) any frequency and Q.
A LP filter (+Linkwitz Transform) can sometimes be a good idea to avoid breaking the woofer because of high excursion but maybe it is better to adjust the Linkwitz Transform for safe operation.

D

19th January 2007, 06:38 PM	#1
mikee55 diyAudio Member Join Date: Dec 2005 Location: West Howe	Linkwitz Transform question Hi all, can someone explain why the Linkwitz Transform doesn't use a lowpass filter? There is no mention on Rod Elliott's Project to use a crossover. I'm just curious before I repair mine.I used a lowpass filter in-between mixer and L. Transform. Anybody else use it this way? Cheers mikee55 __________________ If it don't work, I'll fix it in the mix! Or visit http://lsdp.proboards.com/index.cgi

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19th January 2007, 07:14 PM	#2
Dag diyAudio Member Join Date: Feb 2005 Location: Goteborg	A closed box speaker behaves as a 2nd order HP filter at low frequencies. You might think of the Linkwitz Transform as a "thing" that first makes the FR flat and then makes a new 2nd order HP filter at (almost) any frequency and Q. A LP filter (+Linkwitz Transform) can sometimes be a good idea to avoid breaking the woofer because of high excursion but maybe it is better to adjust the Linkwitz Transform for safe operation. D

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