Posted by Wayne Parham [ 70.234.129.118 ] on March 29, 2009 at 14:06:52:
In Reply to: Re: Active crossover for 3Pi posted by Champion on March 29, 2009 at 09:23:59:
Op-amps are extremely easy to work with. You can design an active crossover with them using the design tool below. Choose a nice Burr-Brown chip for best results. I'm using 627 and 404 chips in a sub crossover I'm working on right now, and there are other op-amps that work very well too. The 627 is good when used in circuits with unity or low gain, like active crossovers.
For the four π crossover, I've found best results with 3rd-order slopes ( 3 poles) on both the woofer and tweeter. The LP transfer function for the woofer has a little bit lower knee frequency, about 1.3kHz. The tweeter is a little higher. I suggest using a potentiometer in both circuits to dial it in. You'll also need to provide CD equalization with an RC network.
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