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Portico 5051 EQ / Compressor-limiter
Gear > Rupert Neve Designs > Portico 5051 EQ / Compressor-limiter
last edit: Justin Vencel 455 day 19 h
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About:
Inductor EQ / Compressor-limiter
The 5051 combines a classic three band EQ based on Rupert’s vintage designs with the power and flexibility of the Portico Series compressor. Utilizing a fully-discrete, class-A signal path and high performance input and output transformers, the 5051 delivers the performance and musicality expected from a Rupert Neve Design.
The Equalizer
The EQ design on the 5051 certainly evokes sonic similarities with some of Rupert’s classic EQs. The 5051 uses a custom tapped inductor with selected capacitors to form the mid range equalizer band and the shelf curves are based on Rupert’s vintage modules, using very similar frequency choices as well. Each EQ section also uses low feedback class-A discrete to prevent low level artifacts and harshness from detracting from the tonal shaping. The EQ however, is a modern design with advantages offered by techniques that were not possible 35 years ago along with improvements in electronic components currently available, and should not be considered a clone. Let’s just say it has heritage.
The Compressor
The 5051 Compressor also features a discrete class A signal path proven used in the Portico Series, withindividually controllable threshold, attack, release, makeup gain, ratio, side chain HPF, Feed-Forward / Feed-back selection and Peak/RMS detection modes. With the compressor inactive, the 5051 may be used as a transformer-coupled, high-performance line amplifier, and two 5051?s may be linked for stereo operation as well.
Feed-Forward or Feed-Back?
The 5051 also has the ability to switch between feed-forward and feed-back modes. If the V.C.A. Control voltage is taken from the 5051 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.
In most of Mr. Rupert Neve earliest designs, feed-back detection controlling the VCA with a rectified voltage from the unit output was intrinsic to the musical dynamic response. However, the very nature of a feedback compressor limits the attack time of the compression circuit. To offer faster, more technically accurate response times, feed-forward detection was implemented on Mr. Rupert Neve’s more modern designs. With the FF / FB switch, both classic and modern VCA responses are available.
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