CHURCH SYSTEMS page 2
If you want a big sound, it might be wise to invest in a subwoofer system, it creates the illusion of volume by adding in the low rumbling tones that smaller speakers just can't reproduce. Many chuches and halls have an A/B speaker system. The A speakers are for small crowds, and when the place is packed, the B speakers are utilized.
The mics used will vary with the application: clip-on wireless mics, boundary mics to place on a lecturn or table, choir mics to hear a wide area, or individual mics on stands or held in the hand. Special care is needed to avoid feedback, that annoying squeal that occurs when the mic recycles sound back into the speakers. The basic remedy for feedback is this: make sure that no live mic is pointed at any speaker. That's it. Try to place speakers so that the lecturer stays behind them, just as a band plays behind the PA columns in a stage setting.
Here's a simple chart to see how big a system is needed:
| small room | stereo system with 50 to 75 watts, 2 speakers, 1 mic |
| small hall | 4 ch mixer/amp with 75 to 150 watts, 2 speakers, 3 mics |
| small church | 4-8 ch mixer, amp 100 to 300 watts and 2 main speakers, 2 satellite speakers, 4 mics |
| med church or hall | 8-16 ch mixer, amp(s), with 200-500 watts and six speakers, 6 mics |
| large church or hall | 8-16 ch mixer, six speakers, amps (200 watts for highs and mids, 500 watts for subwoofers), 8 mics, a monitor system with amp and 2 speakers. |
SPEAKERS: small ones are 10" two ways ( 10" woofer and horn tweeter)
medium ones are 12" two or three ways ( 12" woofer, 5" mid range and horn tweeter)
Big ones are 15" or 18" woofers, with big horn drivers, sometimes in seperate cabinets.
The big 15" and 18" speakers can be mounted near the ground, because they don't add to the intelligability, they just add volume. Remember to get the other speakers into the "line of sight".
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