EDIT: I used the wrong value. Looks like it should be .02mh. Ignore blue line and question. thx.
With the exception of the coils, I found the exact value components of the high pass filter in my spare parts drawer (for the -10db pad). I also found a .24mh coil that I was able to wind down to .20mh (measured it in speakerworkshop).
Then assembled the network and took freq resp measurements, without the big coil, here are the results. 2445J on 2380A.
Green = no hf boost
Red = 2uf bipass
Blue = .20mh + 3uf bipass
Something unexpected is happening with that coil I unwound. It's a Solen S18.24 that I unwound from the outside.
I'd like to get the response above 7khz up by about 3db. Any thoughts?