Most people think that they are good for quieting down the drums. It just makes the sound bounce backwards and actually get louder if you're right by a wall, unless you have them miked. Depending on the size of your church, you may be in a spot to mic the drums. Not to make them louder, but to control the ambience of them more. If you're having an issue with volume from your drummer, then you may want to get him/her to come down a little. If he is a humble young man/lady, then it should not be an issue.