The Portico 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.

Key features:

• Compression: when signals exceed the "threshold" level, the gain is reduced in a controlled manner that depends on the Ratio that has been set
• Gain: from -6dB to +20 dB
• Peak: when engaged, the 543 uses a combination of peak and RMS (average) detection to determine level. When disengaged, it follows just RMS
• SC HPF: introduces a HPF at 250Hz to the VCA side chain signal. This allows the compressor to disregard sustained low frequency content
• Ratio: range from 1:1 to LIMIT (i.e. 40:1)
• Threshold: range from -30dBu to +20dBU
• Attack Time: range from 20 mS to 75 mS.
• Release / Recovery Time: range of RELEASE time is 100 mS to 2.5 Seconds
• Stereo operation: when the LINK switch is engaged on two 543 modules and settings are approximately the same values, GAIN reduction on both channels will be the same to preserve stereo balance and position. This will work properly in link buss enabled 500 series racks, or by hardwiring two 543 modules link busses together in non-compatible racks
• Ducking: when the LINK switch is engaged on two connected 543 modules, the signal passing through the first module may be used to control the amplitude of a second module.
• Meters:Two peak LED METERS are provided that show OUTPUT LEVEL and GAIN REDUCTIONOutput level meter covers the range from -10 to +22 dBu and above which is regarded as overloadReduction is calibrated in dB covering the range +1 to 22 dBu, reading from right to left

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