VRX Really means Wow thats awesome!
about 18 months ago my church purchased 6 VRX832LA speakers for the sanctuary. We only ended up using 4 of them in one center cluster above the pulpit.
We have absolutly no feedback problems using standard Sure lav. mic's or any other mic for that matter. Our church has a full praise and worship band with 20 open mic's at any time. At no time have I ever had any problems with feed back or funny freq's in the system. The congregation is is complete agrement that the sound is correct and right. We were able to remove the old cluster of 10 speakers to get the right coverage so our sight lines are much better.
If there ever was a great speaker, this is it.
And to boot the two remaining speakers we had left have provided us with a great small PA system for many events.