RE: LP filter elbow

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RE: LP filter elbow

Posted by Davey on May 4, 2015 at 09:01:11

In Reply to: RE: LP filter elbow posted by tcnicholas on May 4, 2015 at 05:22:00:

The Marchand XM-9 crossover that MWE used creates symmetrical (same roll-off rate and 4th-order) high/low pass slopes. (It's not easily modifiable to alter this aspect.)

Neither the stock outboard box or the Magnepan recommended bi-amping crossover slopes are symmetrical. What MWE did is create an asymmetrical electrical crossover by not using the high-pass outputs of his XM-9 crossover and creating a first-order passive "bypass" section around the Marchand XM-9 to drive the mid/tweet amplifier. The gist is that he's created an active bi-amping scheme but very close to the Magnepan-designed slopes for the 3.6 speaker.

Since you're a visual guy, take a look at the design I posted many years ago here on the forum. Or take a look at Neolith's spreadsheet which shows the electrical slopes for all of the Magnepan speakers.

http://www.integracoustics.com/MUG/MUG/tweaks/davey/mg3.6xo.htm

Hope that helps.

Dave.

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Follow Ups Full Thread

Topic - 3.6R cheap bi-amping-Thanks to ALL past and present - MWE 19:22:30 05/02/15 (18)

Good job. nt - Davey 10:06:38 05/03/15 (0)

RE: 3.6R cheap bi-amping-Thanks to ALL past and present - neolith 08:49:25 05/03/15 (14)

Capacitors - MWE 10:06:39 05/03/15 (13)

RE: Capacitors - Satie 10:55:55 05/03/15 (12)

RE: LP filter elbow - MWE 14:21:02 05/03/15 (11)

RE: LP filter elbow - tcnicholas 05:22:00 05/04/15 (10)

RE: LP filter elbow - Davey 09:01:11 05/04/15 (0)

Tom-please refer to Roger's excellent reply. nt. - MWE 07:07:40 05/04/15 (0)

RE: LP filter elbow - Roger Gustavsson 06:38:31 05/04/15 (7)

RE: LP filter elbow - Satie 09:20:57 05/04/15 (6)

Satie, I'm curious as to... - MWE 12:23:36 05/04/15 (2)

RE: Satie, I'm curious as to... - Satie 21:05:31 05/04/15 (1)

Thanks! nt. - MWE 05:04:43 05/05/15 (0)

RE: LP filter elbow - tcnicholas 11:55:38 05/04/15 (2)

Apologies not necessary, Tom. If you have the bucks,... - MWE 12:13:25 05/04/15 (1)

+1 on XM44 - Satie 12:21:09 05/04/15 (0)

RE: 3.6R cheap bi-amping-Thanks to ALL past and present - Roger Gustavsson 23:43:21 05/02/15 (1)

RE: Internal XO - MWE 05:52:28 05/03/15 (0)

Follow Ups

RE: LP filter elbow - Davey 09:01:11 05/04/15 (0)

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