What does the (SCH) stand for at the end of some of the crossover schematics I see?

Looking at the various JBL crossover schematics here, I've noticed quite a few have (SCH) after their name and the schematic is different.
LX5 vs LX5 (SCH)
LX2 vs LX2 (SCH)

What does that (SCH) represent?


Thanks,

Eric M.