I was doing some research to purchase a portable sound system for my church and I came across this article from an old issue of Christianity Today (May/June 2002, Vol. 48, No. 3). Apparently if you want to see people come to Christ you just need the right kind of speakers (not the human ones!):
"The dockable systems are powerful enough to accurately portray rolling thunder across the room and the "voice" of God as he declares victory over sin. The effect is so convincing as to be partially responsible for numerous conversions over the course of the play's yearly run. The church's lead technician says it best: 'We pull them out of the children's meeting rooms, plug them up for the Passion play, watch people come to the Lord, then roll them back the following week to pump out VeggieTales again.'"
It is unfortunate that people think a certain sound effect can produce conversions. This is simply yet another symptom of the emphasis on personal experience instead of the Word of God.
"7The law of the LORD is perfect, restoring the soul;
The testimony of the LORD is sure, making wise the simple.
8The precepts of the LORD are right, rejoicing the heart;
The commandment of the LORD is pure, enlightening the eyes.
9The fear of the LORD is clean, enduring forever;
The judgments of the LORD are true; they are righteous altogether.
10They are more desirable than gold, yes, than much fine gold;
Sweeter also than honey and the drippings of the honeycomb. " - Psalm 19:7-10