I can say that for the last 15 years there has been little advancement, of significant importance, for the church sound/ audio solutions. So that means that if your church purchased audio/sound in the last 15 years you may have all the equipment you need to accomplish great audio sound in your church.
So Then Why is it not working properly!:
Is it configured for optimal operations?
Do you have to much equipment making it complicated to operate?
Are your Volunteers/Staff trained well enough to handle the sound system?