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Rupert Neve Designs Portico 511 Preamp for the 500 Series

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The Rupert Neve Designs Portico 511 is a 500 Series Microphone Preamp. With a big, bold preamp and the flexibility o...  Alle vareoplysninger

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Rupert Neve Designs - Portico 511

The Rupert Neve Designs Portico 511 is a 500 Series Microphone Preamp. With a big, bold preamp and the flexibility of variable Silk/Texture, Rupert Neve designed the 511 to combine classic sonics with 500-series value. Incorporating the 517′s powerful preamp, the 5012′s universally useful sweepable high pass filter, and the transformer-saturating power of a variable silk circuit derived from our flagship Portico II Channel, the 511 is a Rupert Neve-designed micpre for the masses.

Rupert Neve: “While creating functional 500 series modules is relatively simple, designing those modules to equal their non-500 series counterparts with the current, voltage and space restraints is quite challenging. In creating our own 500-Series Modules, we experimented with a number of different transformer and circuit designs to achieve the same presence and sweetness found in the Portico Series of modules. The result of these efforts is that outside of the slightly lowered headroom, our 500 series modules are nearly indistinguishable from standard Portico Series modules, and are perfectly suited for studios of the highest caliber.”

Input Section: Input signals may be derived from Mic or Line sources (make sure 48V is off for line sources!). The input has a 10K ? non-reactive input resistance that handles a full 22dBu signal without the need for a pad. The pre-amp is a TLA non-reactive design that precludes the loading of microphones with limited driving capability. A primary gain control provides 66dB of gain in 6dB increments for easy recall, with a +/- 6dB trim for fine adjustment. For condenser microphones and powered DIs, there is +48V phantom power. A transient-optimized HPF continuously covering the range from 20-250Hz is included to tame rumble and proximity effect.

Texture: One of the key developments in the 511 is the Red Silk / Texture control from the Portico II Channel. Building on the “Silk” mode found in the Portico Series mic pre-amplifiers, Texture is designed to adjust the actual amount of harmonic music content from the source material, in effect, providing wide range of tonal options for the preamplifier. Like the original Portico Silk, the Silk Red / Texture works by reducing negative feedback on the output transformer and adjusting the frequency response to more closely resemble Mr Rupert Neve’s vintage designs. With the 511, the Texture control allows these techniques to be pushed further than previous designs, adding about 10 times the desirable THD of the original silk control at its maximum setting.

With that said, we have taken great care to ensure that the musical integrity of source material itself will not be compromised by these harmonic controls (these are not to be confused with controls from other manufactures that may “incinerate”, “demolish” or “destroy” source material), and we believe they can be confidently utilized to fit the personality of any song, instrument or engineer.

Low Noise, Low Distortion Operation: Much care was given in designing the 511 to produce as little noise and non-harmonic distortion as possible. Carefully implemented signal paths and Class A operation are a large part of the 511′s sweet, whisper quiet performance. For more information, go to Mr Rupert Neve’s Design Notes.

Why Transformers? A complete discussion on transformers is out of place at this point, but it is helpful to review some of the essentials where it will be seen that a design needs to be viewed as a whole, not simply from the point of view of a single component.

The fine subtleties of circuit design relating to sonic performance are gradually becoming more clearly understood. For example, research has shown conclusively that frequencies above 20 kHz affect the way in which humans perceive sound quality. But, long before scientific evidence emerged a substantial body of musicians and engineers knew that equipment with apparently the same technical measurements could sound very different.

Incredibly small amounts of musically dissonant odd harmonics have a disastrous effect on the sound quality. Extraneous noise or interference that finds its way into a signal path seriously impairs performance of the whole chain.

Many control rooms make use of outboard gear that is not well protected from external signals. Poor grounding of such equipment can be a serious problem. “Electronically balanced” circuits much used in modern equipment, can give very good measurements on the test bench but they do not provide adequate rejection of the stray fields found in every working environment.

Input and output circuits must be freed from ground dependence so that only the “wanted” signal enters and leaves the processing path. Transformers are the ideal solution. The sweet and silky sound of my classic old favourite consoles was achieved with big transistors and large high quality transformers. Rupert Neve Designs Portico modules achieve similar quality today without the bulk or the cost.

In order that modules can work together as would be expected (i.e. in a proprietary console configuration) without producing hum, R.F. interference, or other interactions, the connecting interfaces, grounding, levels and impedances must receive careful attention. Each of our Portico and 500-Series modules is a complete integral signal processor that delivers its specified performance independently. This is one of the reasons we use transformers.

The main features of the Rupert Neve Designs Portico 511 include:

  • Input: 1x XLR balanced 
  • Output: 1x XLR transformer-balanced 
  • 48V Phantom Power 
  • Maxium Output Level +23dbu 
  • Gain Unity up to 66 +db in 6 db steps 
  • 8 segment LED meter 
  • High-Pass Filter continously variable swept frequency from 20 Hz to 250 Hz 12db/Octave 
  • Sonically flexible microphone preamplifier in 500 Series format 
  • Preamp circuitry from the 517 preamp 
  • Sweepable highpass filter circuit from the 5012 preamplifier 
  • Versatile tone shaping provided by the Silk/Texture circuit (from the Portico II channel strip) 
  • Excellent sound quality and flexibility should make this a great preamp for any project 
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