Lowpass filter design

[diegot]

I have made this schematic putting together various projects of Elliott's site.

I would like to know what do you think about my design.

It uses a "Artificial Earth", phase select switch (0º or 180º), 12dB/Octave Linkwitz-Riley alignment and cutoff at 90hz.

Thanks and sorry my bad english.

 

[diegot]

Sorry, I forgot to attach the file.

 

[diegot]

Final design...

...with remote switch on/off, some final details and better resolution image.