ACA input impedance

[nzlowie]

Hi everyone
I'm going to build some second order rc filters for the inputs of the ACA amps I've built for my active speaker project. From what I've read the input impedance of the amp should be factored into the equation. Any idea what the input impedance of these amps is?

Thanks

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[kacernator]

Input impedance is 10kOhm and it is written in ACA article.

 

[nzlowie]

Thanks, just a bit lazy! Asked before doing a full read...
Cheers

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