Variable phase circuit for sub

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Does anyone know if there is a circuit layout available for variable phase adjustment for subwoofer?

I'm planning to build a sub to compliment my stereo speaker setup (Dynaudio BM5 studio monitors) to extend the very lowest frequencies a bit. I would also like to build my own sub amp with active filters and variable phase adjustment. The problem is that I don't have a schematic for this variable phase circuit.....

If anyone can help me I would appreciate it very much
 
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