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Compression

For signals below the “threshold” level that has been set, a compressor provides a linear path allowing signals to be amplified without the gain being adjusted in any way. When signals exceed the “threshold” level, the gain is reduced in a controlled manner that depends on the Ratio that has been set.

Gain

GAIN range provided is from -6dB to +20 dB. ?As already noted, when compression has taken place, it may be necessary to increase the overall gain to restore the apparent program level

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 Push-Button is engaged on both channels and the two channels, A and B, set to approximately the same values, GAIN control on both channels will be the same to preserve Stereo balance, levels normally being controlled by the channel with the higher signal level.

Composite Operation

Cascading the two independent sections of the Portico 5043 Compressor- Limiter provides extremely powerful and comprehensive control of Dynamic Range.

When an external audio connection is made from the output of one channel to the input of the other, the overall compression characteristics become a composite of the two. For example, Channel A may be set up as a Low Ratio compressor and Channel B may be set up as a High Ratio Compressor or Limiter, to produce powerful composite characteristics:

Ducking

When the LINK Push-Button is engaged, the signal passing through, channel A, may be used to control the amplitude of channel B. For example, the level of music through channel A can be controlled by speech on channel B, i.e. reducing the music level to make a “speech-over” announcement.

Meters

Two Peak LED METERS are provided that show OUTPUT LEVEL and GAIN REDUCTION. These are switched between Channel A and Channel B on the central METER SELECT Push Button.

Output level meter covers the range from -10 to +22 dBu and above which is regarded as overload.

REDUCTION is calibrated in dB covering the range +1 to 22 dBu, reading from right to left,

When used in sequence, the Portico 5043 can be configured easily to provide dual slope compression and limiting as suggested in the graphs below.

Rupert Neve Designs Portico 5043 Compressor-Limiter Duo

RUPNEVE5043
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Rupert Neve Designs Portico 5043 Compressor-Limiter Duo

The 5043 Duo Compressor/Limiter is a powerful approach to dynamics processing for the Portico Series, designed with both tracking and mixing applications in mind.

The Portico 5043 embodies two independent Compressor-Limiters (Channels A and B) housed within a half rack, 1U module. They can be used independently (on two distinct tracks), linked as a stereo pair, or connected in sequence to provide two separate control slopes. When used as a stereo pair, linking the DC control circuits via the front panel A/B button enables the level of each channel to be held in a constant relationship. Rear panel TRS connections are provided to link multiple 5043s. This linking may also be extended to some of Rupert’s former AMEK CIB and DMCL units.

Buss or Line Input Selection

Any number of Portico modules that are equipped with the “TO BUSS” button may be sent to the BUSS input of the 5043 which makes it the ideal choice to form the core of a simple and cost-effective Portico mixing system. The Line input, when selected, provides a dedicated, transformer-balanced 10K impedance bridging input so that the 5043 may be inserted or included in any appropriate part of the signal chain at Console line-up level.

How It Works

To control gain, a V.C.A. or Voltage Controlled Amplifier (or Attenuator) is used. There are many types of voltage control devices, including tubes, discrete and integrated solid state circuits and naturally non-linear devices, each one having its own characteristic behavior that reflects sonically on the final performance, providing a character or signature that can be musically attractive (or not!). The Portico 5043 makes use of a very accurate, low noise, low distortion V.C.A. having essentially no signature of its own.

A part of the audio signal is rectified and smoothed to produce a suitable control voltage for the V.C.A., which has to respond very quickly and have low distortion. If the response is too fast, some of the signal will be unnecessarily gain-controlled. If the response is too slow, the signal will overshoot and the first few cycles will not get compressed. The speed and accuracy of the response – known as the “attack” – and the timeframe that gain remains under the initial control – known as the “release” or “recovery” – each play a large part in the way a compressor sounds.

All Portico modules use input and output transformers and almost entirely discrete component amplifiers. In fact, the Line amplifiers on their own, inserted into the signal chain, are capable of enhancing the sonic quality of many signal sources, especially those of digital origin. These are some of the factors that enable the Portico 5043 to work so unobtrusively within the context of a very high quality audio chain.


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
S/C or LINK
Multiple 5043’s may be daisy-chained via the rear panel jacks. When an individual channel is engaged, it’s control voltage appears at the rear panel LINK jack. When both channels are engaged they are linked together internally and their control voltage also appears at the rear panel LINK jack.
LINE or BUSS input select
Selects rear XLR input or Buss Input jacks to accept Portico series buss outputs.
Maximum Output Level
Balanced and Floating Transformer Output +25 dBu.
Total Harmonic Distortion and Noise
@ 1kHz, +20 dBu output level, no load.
Noise
Measured at Main Output, un-weighted, 22Hz-22kHz, Terminated 40 Ohms.
Frequency Response
Main Output, Unity Gain @ 18 Hz, –3 dB.
Crosstalk
Measured Channel to Channel: Better than 80 dB @ 16kHz.
METERS A/B
Monitors INPUT LEVEL and GAIN REDUCTION of either Channel A or Channel B.
5043 Power
Voltage Range:9 to 18 Volts DC, 9Watts
Connector
5.5mm X 2.5mm DC jack, Center Positive