hello, friends.

i'am doing a mono sub for my main system id like to use a JBL network crossed under 200Hz or lower if possible.
i see the only network offered was a 3145 i think 320Hz, and a handful of "other" networks at 500Hz.

did JBL do a mono network ever.
do mono sub filters exist in a home hi setup?

which networks could i use with a mono powered sub from JBL discriminately.