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Rupert Neve Designs Portico 5043 Compressor / Limiter Duo

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  • Rupert Neve Designs Portico 5043 Compressor / Limiter Duo
  • Rupert Neve Designs Portico 5043 Compressor / Limiter Duo

Rupert Neve Designs Portico 5043 Compressor / Limiter Duo

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2-channel compressor/limiter with independent and linked operation modes

Availability: In stock

$1,795.50

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$1,795.50

Rupert Neve Designs

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Product Description

Details

2-channel compressor/limiter with independent and linked operation modes

Can be ordered with Horizontal face plate for regular rack mounting or vertical face plate for Console or Vertical frame. Please specify.

The Portico 5043 embodies two independent Compressor-Limiters (Channels A and B) housed within a half rack, 1U module. They can be used independently or connected in sequence to provide two separate control slopes. When used independently, for example, as a stereo pair, linking the D.C. control circuits via a front panel Push-Button, enables the level of each unit, "A" and "B", to be held in a constant relationship. Rear panel TRS connections are provided to link multiple 5043s.

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.

 

Feed Forward or Feed Back?

The Portico 5043 provides a choice of feed-forward or feed-back compression modes. The FB Button allows the user to switch between the two modes.

If the V.C.A. Control voltage is taken from the 5043 input, (i.e. before the V.C.A.) the V.C.A. knows right away that a gain change is required and there is almost immediate response. This is known, logically, as a "Feed-Forward" compressor.

If the V.C.A. Control voltage is taken from the 5043 output, (i.e. after the V.C.A.) it cannot act immediately on the V.C.A. because it has already been modified by settings of the V.C.A. and circuits through which it has passed. This is known as a "Feed-Back" compressor. The two compression characteristics are quite different; there is more "Overshoot" and both the attack and recovery ramps are changed, providing the user with powerful choices. Almost all of Neve's earlier designs were "Feed-Back". They were more musical and sweeter than with "Feed-Forward" designs; however the "Feed-Forward" design provides greater accuracy.

Ratio and Threshold

Above a given "THRESHOLD" signals are reduced by an adjustable amount ranging from 1:1, (which is linear, or no reduction at all), to more than 40:1 which is a very high ratio, equivalent to that of a Limiter. RATIO is sometimes referred to as "Slope" because when depicted on a graph, the slope of the graph representing Output versus Input, is what changes.

Ratio and Threshold are closely inter-dependent. If a RATIO as high as 40:1 has been set, then if the THRESHOLD is set at 0 dBu, even when a massive signal of +40 dBu (unlikely!) is presented to the input, the output signal will only be +1 dBu. RATIOS as high as this would normally be set somewhere above 0 dBu - say at +14 dBu, in order to prevent the output signal level exceeding just over +14 dBu to protect, for example, a digital recorder. Similarly, if a RATIO of 5:1 has been set, an input signal which is 10dB above THRESHOLD will only rise by 2dB above that THRESHOLD at the output.

Attack Time

The ATTACK time is the time taken for the compression circuits to start compressing. A long ATTACK time allows short duration peaks to "escape" and go through uncompressed. This may cause overload on subsequent digital circuits. A very short attack time sounds un-natural and robs the signal of "life" by removing transients. Some transients are extremely fast and have little effect on the sound quality. Setting a long attack time often means that almost no gain reduction occurs because the transient is history (!) before compression has had time to operate. However, even the fastest circuits take time to operate which means that there is always some "Overshoot". Small amounts of "Overshoot" are musically desirable - there are exceptions, of course.

Release / Recovery

The notes above explain how the 5043 handles signals of constant amplitude such as pure tones. Real program signals, however, are continually changing in level. The way in which a compressor deals with actual program material depends upon the magnitude and duration of peaks in the program level. If the RELEASE TIME is set to be very short, a short duration signal will be compressed but the gain will return to normal very quickly, giving a fluctuating and un-natural sound known as "Pumping" when the background, or other signals, are forced up and down. The gain will also tend to follow the wave form of low frequency signals. RELEASE TIME should be set long enough for the gain to remain reasonably constant between each bass note or between speech syllables.

Additional Information

Additional Information

SKU RND-5043
Manufacturer Rupert Neve Designs
Condition New
Model 5043H
Type Compressor
Features Solid State
Form Factor Half RU
Effect/Enhancement Compression/Limiting
Number of Channels 2
Connectivity XLR

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