On Monday 20 November 2006 11:10, Sergei Steshenko wrote:>On Mon, 20 Nov 2006 10:46:05 -0500>>Gene Heskett <gene.heskett@xxxxxxxxxxx> wrote:>> On Monday 20 November 2006 10:07, Sergei Steshenko wrote:>> >On Mon, 20 Nov 2006 08:03:04 +0100>> >>> >BISSON Frédéric <zigazou@xxxxxxx> wrote:>> >> If possible I'd like 12 dB/octave because that's what the Gemini>> >> CX-1 crossover has and it suits my needs.>> >>> >You probably know that a crossover made of 12db/octave LPF + HPF has>> > a +3db bump at crossover frequency.>>>> Mmm, does that not disappear when the vector additions are done,>> disappearing due to the phase angle errors near the crossover freq?>>I'd say the opposite - it DOES appear because vector addition is done>and there is a 90 degrees phase shift.>>Linkwitz-Riley crossover has filter that are in phase at crossover>frequency, and they add up flatly.>>Linkwitz-Riley crossover LPF is two same Butterworth LPFs connected back>to back, the same applies to HPH, LPF and HPF orders are the same,>so Linkwitz-Riley crossover can be made of existing LADSPA plugins.>>All this is widely available knowledge; you can try running models>in 'octave' or 'scilab' or simply find the info on the WEB.>>--Sergei. I'll have to take your word for that, my trancendental knowledge usually quits at about the time I'm doing power calcs in 3 phase power systems. -- Cheers, Gene"There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order."-Ed Howdershelt (Author)Yahoo.com and AOL/TW attorneys please note, additions to the abovemessage by Gene Heskett are:Copyright 2006 by Maurice Eugene Heskett, all rights reserved. -------------------------------------------------------------------------Take Surveys. Earn Cash. Influence the Future of ITJoin SourceForge.net's Techsay panel and you'll get the chance to share youropinions on IT & business topics through brief surveys - and earn cashhttp://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV_______________________________________________Alsa-user mailing listAlsa-user@xxxxxxxxxxxxxxxxxxxxxxxxxx://lists.sourceforge.net/lists/listinfo/alsa-user
