At least 2x Th-118 would be necessary to keep up with SH96-HO. More for dance music; 4x is just right for that application.
One thing that a lot of people don't get is, it is NOT the number of subs needed to keep up with a particular top box.
But RATHER-how many subs are needed for the job, and then looking to see if the top will keep up.
You don't HAVE to run loudspeakers at full output capability-despite what some people think.
If you turn it down it will be cleaner.
Sometimes a box like the SH96 is choosen not because of the output capability, but rather for the pattern control-as in many arenas that it is installed in