LXMini crossover frequency alteration - how to work out appropriate RC values

Apologies if this is a dumb-a$$ question but does anyone know if http://doublesecretlabs.com/apps/passxo/ is gone forever, and/or if there is an alternative, working link please?

I cannot find anything that explains how to alter the RC values from searching the diyAudio forums, apart from one mention for specific values for a 4k crossover, which might not quite work for me.

If the calculator is gone for ever, does anyone have any tools, pointers, crumbs that they could share to enable me to work out the RC values that I need for alternative crossover frequencies on the LXMini? y

This will help me make a bit more progress on an active crossover for my current Jordan JX92S / Shackman electrostatic panel speaker experiment. I have a passive crossover that I do quite like but I'd like to play with an active setup as well and I have a few LXMini boards to hand that are overdue for stuffing

Cheers, Nick
 
not knowing previously who is doublesecretlabs, I can't say, but I'm sure guyz will know

now, I know you know what you're talking about, but it'll be good either to post here article/schematic, or link to same

not helping lazy ones to be able to help, just clearing things what's is your reference and then anyone willing to help could use same same nomenclature
 
I got the reference from the thread titled "Can you help me to modify crossover points on a Balanced LXMini Crossover?" at
 
maybe I'm wrong, my memory is vague here, but I believe that was one of several popping and vanishing sites/pages of our dear Michael Rothacher

if I type here @Michael Rothacher , maybe he'll chime in

either to help, or to point that my memory isn't just vague but also wrong
Sorry fellas, I moved everything over to passdiy.tv a while ago. I've been trying to consolidate everything there. 🙂