Anyone know which are the subwoofer inputs?

I've seen posts that detail the outputs going to the speakers but not the inputs from the head unit. The one diagram I found was somewhat unclear... unless maybe the mark levingson amp doesn't have special inputs for its subwoofer? If anyone knows more please lmk! Thank you and aloha!

 

I have a couple of ML amps they do have a sub input (I've tested it) but don't have the one specifically in your car. Hopefully someone else can be of more help.