For best performance, expensive, high quality, well behaved speakers should be mounted as close to the ceiling as possible. Very high cost system to do. Generally not very good for music unless you can double the cost of an already system design. System requires 70 volts distribution An amplifier for ever row of speakers Not recommended for minister who like to roam around with wireless microphones. Speakers creates overlapping interference patterns which creates dead spots.
Speakers creates overlapping interference patterns which creates dead spots.
A delay for the back speakers are a must for reasonable performance. You need two channels of amplification. There are usually more than three rows of speakers. Column speakers are generally used but not effective. A delay is needed for each row of speakers.