| Active crossover for 3Pi [message #53344] |
Sat, 28 March 2009 20:32  |
Champion
Messages: 40
Registered: May 2009
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Baron |
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Hi Wayne, I have read about the opamp implementation of active crossover for 4Pi. Is that suitable for 3Pi as well? Have anyone designed a Kit? Thanks. Regards,
Jacky
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| Re: Active crossover for 3Pi [message #53349 is a reply to message #53348] |
Sun, 29 March 2009 13:06  |
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Wayne Parham
Messages: 18783
Registered: January 2001
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Illuminati (33rd Degree) |
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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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