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In Reply to: RE: What active crossover are you using? posted by tomservo on June 22, 2014 at 07:39:35
You're correct if you use a text book formula to design the crossover. But that's not true if you use a computer especially with driver specs taken with measurements from the actual drivers you are using. Then using a good computer simulation you use a nice target function(the way you want the driver/crossover to work) and you can usually get really close to this ideal.
Follow Ups:
When you have loudspeakers where the drivers combine into one new radiation, then the only way to design a crossover is with measured mag and phase and to do it with a computer.
To make a passive xover also requires the impedance curves and phase as well.
To go further and make a Synergy crossover that eliminates the phase shift caused by normal crossovers (normally only possible with DSP) requires all the above and adapted shape filters.
A speaker like the one below can reproduce a square wave over a broad band, appears to be a single driver based on dispersion and mag and acoustic phase but is a 3 way system.
Picture of one example on post #15 here;
http://www.avsforum.com/forum/155-diy-speakers-subs/1496784-synergy-horns-dayton-prv.html
A big part of the problem is that many people try to use drivers beyond realistic lower or upper frequency limits. As an illustration, if a "midrange" driver's low end starts to roll off at 500 Hz, there will be people who will want use it all the way down to 500 Hz, which is a mistake. Confining a driver's operating range to well within it's "flat" range goes a long way toward avoiding crossover issues.:)
Edits: 06/22/14
That would be true if drivers were nice but their flat ranges are often relatively narrow and they start ringing all over the place for a lot of their bandwidth. And even if you just use the flat portion the crossover points will usually be close to the bad areas and those areas have to still be dealt with so the crossover region for the driver follows the roll off correctly. Otherwise even if the net result of all the drivers and crossover are flat the system won't sound that great. Transparency and other factors will suffer.
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