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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: How To Determine Xover Points posted by jcmusic on July 28, 2014 at 18:55:10:
A few manufacturers (like Wilson) are hush-hush top secret about their slopes and crosspoints (like anyone could possibly market an exact clone!), but most will tell you at least generally that it's 4th order acoustic at 2.2kHz or whatever. The authorized repair techs for any given brand know exactly what's in the crossover and can probably tell you, if they're not sworn to secrecy.
Otherwise, as others have pointed out, you're going to do a lot of measuring and calculating. Once you know the impedance and frequency response characteristics of the raw drivers IN THE ENCLOSURE, you can determine the values for all the crossover parts and their positions in the circuit layout, and reverse engineer the whole thing according to the established math for capacative and inductive reactance. (There are LOTS of formulas "or what" involved here, most of them full of logs and roots and square pies). Or just measure the electrical transfer functions of the filters -- voltage vs. frequency -- across the terminals of each driver and superimpose this on the measured unfiltered acoustical responses of the drivers.
If your eyes haven't yet glazed over, and you're really interested in learning this stuff, start with Ray Alden's "Loudspeaker Design 201" for basic principles. If you like lots of equations, supplement this with Vance Dickason's "Loudspeaker Design Cookbook." The "Woofer Tester" and "Omnimic" software/hardware packages from Parts Express, combined with a suitable laptop, will give you serious measurement capabilities. And then you can purchase some really advanced speaker design software, or download for free some altogether decent software (Jeff Bagby's Passive Crossover Designer, and various Excel-based designware from the FRD Consortium), and get serious about learning to measure and design speakers. Expect a fairly long learning curve, especially if your math and engineering background is weak.
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Follow Ups
- Ask the manufacturer or one of their licensed service techs? - Brian H P 11:34:49 07/29/14 (0)
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