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543 - 500 Series Compressor

The 543 Mono Compressor delivers the unobtrusive, musical-sounding dynamic control and brick-wall limiting made famous in the Portico 5043 to the 500 series format. The 543 features a fully controllable compressor-limiter with feed-forward / feedback modes, Peak / RMS detection and a built in side chain high pass filter. With an unrivaled heritage and a tremendous feature set, the 543 yields a combination of rich warmth, flexibility and precision that is sure to resonate in the ears of sound engineers the world over.

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Built around Mr. Rupert Neve’s custom transformer designs, each 543 module encompasses individually controllable threshold, attack, release, makeup gain, ratio, side chain HPF, Feed-Forward / Feed-back selection and Peak/RMS detection modes. With the compressor inactive, the 543 may be used as a transformer-coupled, high-performance line amplifier, and two 543 may be linked for stereo operation as well. The chassis is built to standard 500 series specifications, with power and I/O provided by the rack. Gain Range: Continuously variable from 6 dB to +20 dB. Threshold Range: Continuously variable from 36 dB to +22 dB. Ratio Range: Continuously variable from 1.1:1 to Limit (40:1). Attack Range: Continuously variable from 20mS to 75mS Release Range: Continuously variable from 100mS to 2.5 Seconds. FF/FB: Feed-Forward or Feed-Back VCA control. Maximum Output Level: Balanced and Floating Transformer Output Maximum output from 20 Hz to 40 kHz is +23 dBu. Total Harmonic Distortion and Noise: @ 1kHz, +20 dBu output level, no load. Main Output, compressor bypassed Better than 0.0006%. Main Output, compressor engaged Better than 0.02% Noise: Measured at Main Output, un-weighted, 22Hz-22kHz, Terminated 40 Ohms. With Gain at Unity, Compressor disengaged Better than 103 dBu. With Gain at Unity, Compressor engaged: Better than 92 dBu Frequency Response: Main Output, Unity Gain @ 18 Hz, +/- .1dB @ 150 kHz -3 dB. Crosstalk Measured Channel to Channel: Better than 90 dB @ 15kHz. METERS: Monitor INPUT LEVEL and GAIN REDUCTION

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