Well, I tried to get the parameters back in the day with no success.
Your best bet is to duplicate the XL210 or half the XL410. Obviously
I had one in a SWR WM10 for a long time and it performed better than the original one.
There's a Deltalite II now, giving even better performance.
So IME similar enough to perform in a box Deltalite II does. EDIT:
Dug up my old thread about XL10 T/S parameters Hartke XL 10" T/S parameters?
, no luck there either I'm afraid but it seems that mine is an Eminence (or Hartke uses Eminence code
The lab ain't ready yet...
Neither is the soapstone test cab.