JBL LX4-1 Crossover Network for parts/repair(untested) High Frequency Control

Description

PLEASE NO RETURNS, FOR PARTS ONLY.
Just found this old control in a storage unit out of Hollywood.
Zero idea what it does.
Zero idea how to test it.
It has tape around it, but the tape is only to hold the mounting screws so they don’t get lost.
Unit isn’t cracked or anything and to the eye it looks good. Knob works.
Ships free, good deal because it’s way over a pound.
Thanks for l👀king, god bless.