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JML had this circuit drawn over on PETT. He is using it with the former Epique 5.25" midbass in a big 3way. I found it to be rather novel in how it does what it does, so I'm sharing it here. I added the shorted coil and resistor, as it will add in countering the top-end and dip if needed. Everything else is as he had it drawn, values included, except that he used it in a series xover network instead.
I really like the simplicity of it, and how elegantly it does its job. It reminds me slightly of a cross between a di-aural and a ladder-delay filter with shifted values.
I zipped the .dxo for Xsim for those interested.
Comments
I don't get it. What's special about it? I would want to avoid a short circuit at high frequency.
It's fairly badly drawn, this is the same circuit.
![](https://diy.midwestaudio.club/uploads/editor/r6/kqx32qy1w2ba.png)
I think you are supposed to take one or the other shunt out of the circuit?
The series coil raises the impedance so its not a short.
Yes, that is the same. The layout was interesting too, at least to me.
Suit yourself...
InDIYana Event Website
Include the series coil and it's just a 3rd order filter.
This will provide a similar result without an impedance problem.
![](https://diy.midwestaudio.club/uploads/editor/76/t4gyo40tt0b6.png)
Filter transfer function comparison:
![](https://diy.midwestaudio.club/uploads/editor/on/4n109gwgfeji.png)
Impedance comparison:
![](https://diy.midwestaudio.club/uploads/editor/ti/yj0v4hrpnwul.png)
I'll go back to my corner now.
There are a lot of different ways to do this stuff . . .
Much more understandable for me. Thanks.
I just use DSP and forgo all the electronical stuff I don't have time/brainz to learn because I can test out and qualify at least 6 different XO points, Types and PEQ's on a 3-way alignment before JR can finish a 6 pack of tall Miller Lites on a Friday evening after work.
I find that approx 2 beers is optimum for voicing passive Xovers... ha
Two Imperial Stouts and I'm a goner.