Alembic F-1X or Demeter VTBP201 (or the slim version)
Klark Teknik DN405 or Rane PE17
DBX223 (or XL)
many other choices but do avoid:
Nady parametric EQ PEQ 5B
Behringer make a decent parametric and crossover. I have Klark Ts and Behringer and they all work. They deservedly get bad press for their practices particularly from Saints who have never transgressed and have never ever clicked play to an illegal mp3.
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co-opted into:
Lefty Union, serial no: 111
DIY Custom Bass Club, serial no: 19.