Soundcraft K3 HPF mod - design help

Hello!

I recently bought Soundcraft K3 Theatre console for live gig and off site recording purposes. Very neat modular console but it lacks one feature - variable hpf. There's fixed 100Hz 12db/oct filter which I'd like to modify.

Due my design skills is pretty much zero I'm asking if you guys can please check out schematic I draw before I make anything stupid.
I spiced circuit and simulation gave me slopes from 25Hz to 1kHz.

Original K3 Theatre input schematic
Modified hpf scematic
Spice curves

And simple question about potentiometer - it should be antilog, right?

Thanks in advance,
Paavo

Anyone?

To make my question bit more specific:
Is there risk of oscillation, raised noise or any other problem with component values I've chosen?

Cheers,
Paavo

> risk of oscillation

No.

Less than before. Note that R32 R33 were in a 4:1 ratio (100K:22K). This bumps-up the response near the corner and steepens the fall in the octave below the corner. Your equal-value unity-gain plan has a gentle corner.

Thank you PRR.

Now I have to find out some time to make this thing true...

-Paavo