Sub-filter for N-ripole subwoofer

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Where can I find a schematic for a sub-filter with the following main characteristics ?

- subwoofer filter control, 3rd order, 50-150 Hz
- volume control
- variable phase control (0-270°)
- bass boost control (Bass-EQ) 0-6 dB with a
- bass boost frequency control (20-40 Hz)
 
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