There is a general idea that main systems need to be mega powered to be effective. That's just NOT so.
Efficiency is the key, and the jbl 10s do a pretty good job all by themselves in this department. They lack some "ooomph" in teh bass area, especially when up on sticks.

I had a pair of thos eons, and I did a wedding for 400 people once, and the added Roland sub ( also a 10 Hmmmmm )was all that was needed to fill up the bottom end. The JBLs project the mids and highs very well when they don't have to try and reproduce bass, so with the right crossover point ( about 175 or so ... ) a moderate sub will work wonders.

Some of the new kids on this forum seem to think that we all want to carry lots of gear around, but those of us that have done it long enough know how to get the most from the smallest packages!

Coverage is not as difficult as it may seem, and pure volume is not always the answer. The 350 watts from the JBL eon tops will sound like 1000 if a sub is used correctly. Unless you're doing a rock room ... those large setups are just overkill, and usually scary too.