This cannot be the "the first time such rock-and-roll acoustic engineering has been employed in a church" if it is referring to digital delays. The other weekend I visited a gospel church which used maybe ten dbx DriveRacks, along with the finest mixing console I have ever seen in a house of worship, a top-line analog Soundcraft. The use of a horizontal line array sounds unique to me! James B. Lansing of JBL did a lot of this work long before DSPs became economical, using huge, carefully-engineered tractrix horns. A brilliant and tragically-ended life who contributed enormously to loudspeaker engineering.

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