Steve,
I am in the same boat as you with my two S16 units due to arrive any day now.
My sales rep highly recommends the Whirlwind Cable and swears it will work just fine - To the point of a full refund if not!
SPECIFICATIONS
CABLE - Whirlwind WCAT5E ruggedized CAT-5e cable, 8 cond. 24 GA UTP,
238 O.D., PVC jacket
CONNECTORS - Neutrik NE8MC-B ETHERCON
http://whirlwindusa.com/catalog/pre-...con-connectors
Notice - This is a UTP cable and rather costly but worth it if it stands up to weekly road use and abuse.
It would be nice if someone from Behringer could give us a little assistance with this. Like you say STP or UTP - what is recommended?