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RE: What do you make of this? (Impedance curves)




Sorry Pix, the only thing I can offer you is the easy way out. The graphs are for the ALK Universal crossover. It is a first order for woofer/mid and second order for mid/tweeter, and it's right at the points you want.

There was a lot of talk recently on the Tube diy forum about phase shift, and phase shift in crossovers. You can see from the middle graph that there is no appreciable phase shift with this three way crossover. Also the impedance stays within a six to eight ohm tolerance.

What I'm trying to say is these crossovers are designed right. You could pull your hair out trying to design one as good, or you could just spend the $320US. It's too bad but Mr. K used to publish his schematics, BOM, and layouts of his crossovers for diy'ers, but one guy started to build them for commercial gain, so he took them down. That really hurt guys like you.

The autoformer on it will attenuate down 18db, so it will work for you. He also has second order and 120db brickwall filters.

Thinking about it, your woofer goes so high. With a first order slope your woofer is going to be putting out significant signal at 4000Hz. Maybe 10db down before it's rolloff? At some point I think you should try a steep filter on your woofer. Probably asymmetrical like 24/12, or 48/12. Even 24/24. An electronic crossover would make it much easier, and try a nice analog active crossover like the Marchand. I think you will be playing at this for awhile. :)

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