Planar Speaker Asylum

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IME dipoles do not respond well to typical symmetrical steep crossovers

124.171.154.234

In Reply to: RE: active crossover install posted by tberd on October 12, 2016 at 06:44:50

I'd suggest he tries a 1st order high pass and 3rd low pass for the bass.

These will blend in phase quite well, the high pass might even be possible as a passive line level filter on the back of the amp's input sockets.

Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger

Follow Ups:

RE: IME dipoles do not respond well to typical symmetrical steep crossovers - Roger Gustavsson 03:42:34 10/18/16 (3)
If going from a 4th order to a 3rd order low pass, should not the phasing of the woofers be changed?
- RE: IME dipoles do not respond well to typical symmetrical steep crossovers - neolith 17:17:57 10/18/16 (1)
  The polarity needs to remain inverted - remember Magnepan did not mention changing the polarity with their recommendation.
  Here is the OEM xo (LP 4th order @ 280 and HP 1st order @ 200):
  
  and here is the Magnepan recommended xo for biamping (LP 3rd order @ 250 and HP 1st order @ 200):
  
  In either case the filters need to be "phase aligned". The output curves are similar and I expect good success with either but the 4th order will be closer to the original voicing.
  
  I married the perfect woman. The downside is everything that goes wrong is my fault.
  
  Edits: 10/19/16 10/19/16
  - RE: IME dipoles do not respond well to typical symmetrical steep crossovers - Satie 08:52:31 10/19/16 (0)
    The acoustic rolloff of the midrange is between 2nd and 3rd order so the combined XO is legit in either alignment. In my case, with a line of Neo8 the rolloff is rather clearly 2nd order so the 3rd order alignment has clear benefit. Besides which, the 3rd order Ashly XO I use for the bottom LP has more flexibility with its Q control so you have a family of roloffs at any freq you are trying. .
- Yes, of course that is implicit they should be connected to match the panel's connections - Timbo in Oz 13:37:00 10/18/16 (0)
  That is implicit with odd order slopes.
  
  Warmest
  
  Tim Bailey
  
  Skeptical Measurer & Audio Scrounger

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