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I am very sorry to hear this.
HK did a friend of mine that was a designer for Elan Home systems the same way.They did all the senior engineers that way from what I was told.
Sent in a hatchet man...

I found this on High Eff Loudspeaker Asylum forum: http://www.audioasylum.com/cgi/vt.mpl?f=hug&m=173756

There are diagrams for the Zilch Z19 crossover including the HF and MF L-Pad controls.
...

"As you see in the M19 crossover, R2 may be varied to adjust the amount of compensation."

I have been trying to fix the same problems of 'Shouty' sound from HF horns.

The Horn and driver...

Thank you for your posts related to this area of the Model 19 crossover. I have been trying to sort out the T-Filter and how it affects the high freq response.

I, too, am trying to 'clone' this...