A single channel automatic gain controller with noise reducing downward expander, peak limiter and selectable 'speech curve' filters. Input may be from mic or line. Use the 421m to increase intelligibility in public address and paging systems or in any application where constant audio levels are desirable. Set the 'target' output level and the 421m gently boosts signals that drop below your target, and smoothly pulls back those that rise above it.
Operation is automatic, precise, and transparent.
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