Rupert Neve 543 Mono Compressor / Limiter

The Rupert Neve 543 Mono Compressor delivers the discrete, musical-sounding compression and limiting made famous in the Portico 5043 to 500 series.
The 543 features a fully controllable compressor limiter with feed-forward/feedback modes, Peak/RMS detection and a built-in side chain highpass filter. Specifications: 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