No Bass Amp??

[MNAirHead]

IEM is the way to go in this situation I used them all the time and I use no amp
I use a SansAmp to the PA. This gives you an effected line out to the board and you can hear yourself just fine soon the rest of the band will be crying they can't hear the bass but you can pretend not to hear them while enjoying yourself not to mention one day your back will thank you

"I can't hear you" is almost the objective for this type of room.

Only who can really hear you are those on IEM....