CFL Linkwitz Transform Designer - Help

[altork]

Hello the forum,
To implement a "Linkwitz transform", I use the program
“CFL Linkwitz Transform Designer with Monte Carlo Sensitivity Analysis” edited by Charlie Claub.
CFL Linkwitz Transform Designer with Monte Carlo Sensitivity Analysis
It’s a wonderful tool.
But who can explain to me the values of the circuit output impedance given by the program?
I wanted to ask the question directly to Mr Claub, but the email address does not pass ...
I do not understand the very high values displayed.
This disturbs me, because these values are usually low on an AOP output, according to my modest knowledge ...
I'm planning a buffer on the input, OK, but on the output (to a fourth order Linkwitz-Riley filter),
how to ensure correct agreement with the indicated output impedance values?
Very high impedence buffer ??? Help, something escapes me ...

 

[Davey]

It's an incorrect calculation of the circuit output impedances.

A typical LT circuit with nominal components will have a very low output impedance and be perfectly capable of driving following circuitry with no alteration in response.

Dave.

 

[altork]

Thanks Davey,
It reassures me and confirms what I thought.
So input buffer and direct output link to LR4 filter.
Cordially.

 

[Davey]

Generally, you'd employ your LR4 filter (and any attenuation) ahead of an LT circuit, but the rule is not written in stone.

Good luck.

Dave.