Request For Comments on my future linkwitz corrected sub

Hello, I am a total electronic newbie, I did this schematic, I wanted some comments, if I made big mistake.

I have some few questions :
- where shall I put the volume pots ? Does the resistance of the volume pot impact the opamp ?
- are the input buffer useful ?
- is this design good for phase inverter ?
- how much should the opamp be loaded ? like 10k, is 100k ok ?
- is the high-pass filter usefull ?
- should the stages be in a different order ?

The overall system will work on 24V, I'll make something to have a 12V to have a virtual mass.

Thank you very murch !
 

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