Sounds like a thing I did few months back in a large gym at a consolidated high
school for a benefit show. From singer/songwriters to electronic
drums/keys/vocals.

I had 4 EON G2's/15, Soundcraft MX-16, Sm58/57's and D.I. boxes

In all candor, after having done the room many time with much bigger gear. The
EON's worked like a charm.

Their front loaded design doesnt' squirt high frequency off the back wall,
ceilings and side walls.

Basically the reach out to about 60-75% of a basketball floor and trail off.

We had about 1000 chairs on the floor wiht a stage about 3-4 high at one end.

The trick is to not excite the room too much in the reverberant field.

Proper mic/placement/techniques will go a long way to making it sound as good
as possible .

I would recommend NO effects/proccessor etc. as they only are time modifiers
and the reverberant nature of the room will give enough of that to be nice.

Again, DO NOT let the doomsayers and the "better gear than that" mentality to
sway you in using what you have and getting the most out of it.

RKeithBrown