QSC SPL-1 Precision Limiter

The SPL-1 is an embedded accessory that provides two independent channels of power limiting, for speaker protection, SPL regulation, etc. The SPL-1 is a feedback-type limiter, using samples of the amplifier’s output signals as references. The user-selectable thresholds are scaled to the amplifier’s maximum output level, with sixteen possible settings from 8.3% (-10.8 dBr) up to 100% (0 dBr) of full rated power. Each channel has three user-selectable attack/release speeds, for optimizing limiter response to specific types of program material and/or loudspeaker types. The circuitry uses high-performance VCAs from THAT Corporation to provide precise, low-distortion gain reduction. Download PDF file

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