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RE: Any Tympani-IV / T-IVa owners? Working on mine, and mods

Hi Roger-

I've modified my MID/Tweeter XO's, and made a minor change to the XO box.

I have the original T-IV external XO boxes, and I have reduced the inductor on the bass output from 6mH to 3mH by eliminating one inductor.

On the internal XO, the changes are more extensive. I'm still working on it a bit, but the basic XO change looks like this:





That change uses the existing components in the Magnepan XO, by eliminating several of the capacitors, and re-configuring those that are utilized. My LTS model does not like 'm' or 'M' for milli-Henry, so I used 'u' and converted to micro-Henry for the inductor values. The 270uH parallel to the Tweeter are the two 0.135mH inductors of the original XO placed in series.


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