Sound systems have been installed in halls and outdoor facilities for the amplification of orchestral and operatic music. Most systems employ a central or stereo loudspeaker channel at the front of the audience. (In one system the direct and early sound travel to the listeners unamplified.) Other channels of distributed loudspeakers above the audience are fed from appropriate time delays or through positive-feedback systems. Condenser-cardioid microphones are usually employed for separate pickup of orchestra, opera singers or soloists.
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