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Rupert Neve Designs Portico 5043 Duo Compressor Limiter
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      Rupert Neve Designs Portico 5043 Duo Compressor Limiter (482652)
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Stereo bus compression or tracking — get that great Neve Sound with this powerful 2-channel compressor/limiter.

The Rupert Neve Designs 5043 Compressor/Limiter Duo is a new and powerful approach to dynamic processing. This new addition to the Neve Portico Series is designed with both tracking and mixing applications in mind.

The Portico 5043 embodies 2 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 2 separate control slopes. When used independently, for example, as a stereo pair, linking the DC 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 Portico 5043 compressor units. This linking may also be extended to the former AMEK CIB and DMCL units. When used in sequence, the Neve Portico 5043 can be configured easily to provide dual slope compression and limiting.

Portico Series Awards:

Rupert Neve Designs has been honored three TEC Awards since its inception in 2005. The Portico 5042 "True Tape" Emulator (#482649) won for achievement in the category of Signal Processing Technology/Hardware. The Portico 5015 Mic Pre/Compressor (#482645) won for achievement in the category of Mic Preamplifier Technology. The 5088 Discrete Analogue Mixer won for achievement in the category of Large Format Console Technology.

Rupert Neve Designs received the Mix Certified Hit Award in 2006 for the 5088 Console and the Portico Range.

Rupert Neve Designs received the Future Music Platinum Award for the Portico Range in 2007.


How it Works

In order to control gain, a V.C.A. or Voltage Controlled Amplifier (or Attenuator) is used. There are many types of V.C. including the use of tubes, discrete and integrated solid state circuits and naturally non-linear devices, each one having its characteristic behavior that reflects sonically on the final performance, and gives it 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, low frequency signals will themselves, be 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 time frame that gain remains under the initial control, known as "release" or "recovery" and plays 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.

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.

Threshold control covers the Range from below -30dB to +22dBu. When THRESHOLD set at a low level, with a fairly high RATIO the amount of gain reduction will be considerable and it may be necessary to use some GAIN after the compressor to restore the apparent signal level.

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.

Setting the right values of release and attack is what compression is all about! Once the principles are understood a Compressor-Limiter such as the 5043 provides a powerful tool that actually appears to enhance the dynamic range of a recording and so provide greater musical enjoyment.

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 unnatural 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.


Rackmounting Porticos:
If you'd like to rackmount a single Portico, Neve offers the Half Rack Joining Kit (see #482654). Or to rackmount two Portico units, Neve offers its Horizontal Joining Kit (see #482653). Another option for mounting single half rack units is the Raxxess Universal Rack Shelf (see #421642).


Mr. Rupert Neve — the grandfather of pro audio

If anyone could be considered for the title, "Grandfather of Pro Audio," the first name that would leap to mind would be Mr. Rupert Neve.
Recognized as the developer of the modern mixing console, Rupert's handiwork is found in thousands of studios around the world.

In 1997, Rupert became one of a very few personal recipients of a Technical Grammy award. In awarding his Grammy, the Recording Academy acknowledged Rupert's profound impact on the industry:

Mr. Rupert Neve Grammy Honors

"For setting the standard for quality sound reproduction through his engineering and his innovative designs, which have made possible unparalleled advances in the quality of recorded sound; in recognition of his influence on a generation of audio designers; and for his dedication to purity of audio reproduction."

The morning following the amazing Grammy Awards ceremony in February 1997, Rupert and Evelyn Neve hired a stretch limo to take them to the airport. After all, for that day at least, Rupert was a star. Carrying the coveted Grammy Trophy in its distinctive blue Tiffany bag, they headed for security.

"What is this?" the security guard asked, puzzled by the strange image on her screen. "It's our Grammy," Rupert replied. The girl looked startled and in hushed tones said, "I'm so sorry sir. You'll have to check this. We can't carry ashes in the cabin."

"No, no, no," Rupert explained. "My Grammy - not Granny. Have a look if you like." She opened it up and for a moment security at the airport came to a standstill as girls screamed and all gazed in awe at the beautiful replica gramophone. It was almost the best moment of the whole proceeding.

Mix Magazine Hall of Fame

In 1989, Rupert was inducted into the Mix Magazine Tech Awards Hall of Fame in recognition of his lifetime contribution to excellence in recording and sound.

An Elite Fraternity

In 1999 he was honored as "Man of the Century" by Studio Sound magazine. At the turn of the century, Studio Sound conducted a survey inviting readers to vote for the Top Ten personalities of the industry in various disciplines. The first was Audio Personality.

It is Rupert's prized honor to have been selected by his peers in the Pro Audio business as number one Audio Personality of the 20th Century.

At the turn of the century, Studio Sound conducted a survey inviting readers to vote for the Top Ten personalities of the industry in various disciplines. The first was Audio Personality.

The Audio Century: Top Ten Audio Personalities of the 20th Century

1. Rupert Neve - champion of audio quality
2. Ray Dolby - household name
3. Sir George Martin - people's producer
4. Willi Studer - tape machine pioneer
5. Colin Saunders - founder of SSL
6. Alan Blumlein — inventor
7. Georg Neumann - microphone Designer
8. Michael Gerzon - mathematician
9. Valdemar Poulsen — inventor
10. Les Paul - guitars and multitracks









Rupert Neve Designs Portico 5043 Duo Compressor Limiter Features:

  • 2 independent Compressor-Limiters
    TRS connections provided to link multiple 5043s
    Analogue Operation
    Intended For Recording, Mixing And Mastering Applications
    Compact Half-Rack Design
    Heavy Duty Construction


Rupert Neve Designs Portico 5043 Duo Compressor Limiter 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.
    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, —3 dB.
    @ 150 kHz —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
    Current consumption:
    @ 9VDC = 1.0 A typical
    @12VDC = 730 mA typical
    @15VDC= 570 mA typical
    @18VDC= 480 mA typicalinput impedance
    output impedance


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