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Multi-Way Conventional loudspeakers with crossovers

Contour Network Designer
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Old 12th January 2020, 08:51 PM   #1
PeteMcK is offline PeteMcK
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Default Contour Network Designer

Anyone used this?:
Contour Network Designer / Calculator Help
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Old 13th January 2020, 01:51 PM   #2
David Morison is offline David Morison  Scotland
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This is the kind of "off the shelf" calculator that seems super convenient at first, but will rarely provide good results.
The reason is that it is calculating component values based only on electrical theory, not the real world response of driver + cab.
So in theory, XmH and YΩ may give a good shape, but this calculator has no way of knowing if that rolloff is in any way suitable for the actual project. Specifically, it doesn't know if the electrical impedance of the driver stays flat throughout the frequency range of interest, so the actual real life response could be quite different.
Albeit it's a lot more work, it's much better to get actual frequency and Impedance response files and model the results in something like XSim or VituixCad.
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Old 13th January 2020, 05:05 PM   #3
Lojzek is offline Lojzek  Croatia
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And let us not forget the truly excellent excel spreadsheets by Laub/Bagby/Verdone which contain all possible calculators a DIYer may need.
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Old 13th January 2020, 11:47 PM   #4
PeteMcK is offline PeteMcK
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Just trying to calculate a 'theoretical' 3db/oct falloff.....
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Old 14th January 2020, 09:11 AM   #5
Lojzek is offline Lojzek  Croatia
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You can do that a lot faster employing XSim to do that graphical solution for you. It comes with default driver data, 70dB and 8R flat. You can add a network in a couple of seconds.
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Old 14th January 2020, 04:30 PM   #6
system7 is online now system7  United Kingdom
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I find that site's 2 way filter designer very useful.

2-Way Crossover Calculator / Designer

Butterworth is the filter for flat impedance and power response:

Click the image to open in full size.

So lets build it, time-aligned here IIRC:

Click the image to open in full size.

Terrific impedance and phase alignment:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

The 3:1 ratio of components comes from the hexagonal symmetry that hides in BW3:

Click the image to open in full size.

Having got impedance flat, there is no reason you can't apply a contour to the whole thing at the amp output.

Since this is an 8 ohm filter, 4 ohms and, say, 1mH will create 3dB bafflestep. In practise you use 6 ohms for most drivers. So 3R plus 1mH.

Graphs from Boxsim: Software | Visaton
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