Description

The 551 Inductor EQ is the only equalizer for the 500 Series actually designed by Rupert Neve. Featuring 3 bands of EQ inspired by Mr. Neves most prized vintage designs, along with custom-wound inductors, transformers and class-A gain blocks, the 551 brings the thick, powerful lows and sweet highs of Ruperts classics to the 500-Series format for the very first time.
The Best-Of EQThe 3-band, custom-tapped inductor EQ on the 551 was inspired by RND s favorite portions of Rupert s vintage EQ designs. The low frequency band is designed to produce a creamy, resonant bass response however, unlike the vintage modules that inspired it, the LF band on the 551 can be used as either a shelf or a peak filter, adding punch, dimension, and control to your low end.The 551 s inductor midrange band is ideal for sweetening vocals and instruments while bringing them forward in a mix, and its proportional Q response makes it well-suited for minimizing problematic frequencies. The high frequency band is a hybrid vintage / modern design, blending inductor circuitry with capacitor-based topologies to achieve vintage tones with enhanced control. The High Pass filter is a 12dB/octave design with a fixed 80Hz frequency, and can be used in tandem with the low frequency EQ to add low-end presence without clouding the source material. As Rupert originally intended with his most prized classic designs, each EQ section uses low-feedback, class-A discrete electronics to prevent low-level artifacts and harshness from detracting from the tonal shaping. However, this new circuit is a decidedly modern design with updated techniques and components that were simply not available 35 years ago, and should not be considered a clone .Both the high and low band can be switched from shelf to peak curves and offer 15 dB of boost or cut. The high band can be switched from 8 kHz to 16 kHz, and the low band can be selected at 35 Hz, 60 Hz, 100 Hz or 220 Hz. The inductor based Mid Band offers 6 center frequencies; 200 Hz, 350 Hz, 700 Hz, 1.5 kHz, 3 kHz and 6 kHz. The Mid Band also has a Mid Hi Q switch to narrow the bandwidth (increase the Q) of the filter.

Rupert Neve Designs 551 Features:

• Inductor EQ
  The first 500-Series EQ designed by Rupert Neve. 551 EQs are built around custom-wound Inductors and are based on our favorite bands from Mr. Neves classic EQ modules
• Low EQ
  +/- 15dB Shelf or Peak, selectable at 35 Hz, 60 Hz, 100 Hz or 220 Hz
• Mid EQ
  +/- 15dB with 6 center frequencies; 200 Hz, 350 Hz, 700 Hz, 1.5 kHz, 3 kHz and 6 kHz, with High Peak switch to narrow the bandwidth (increase the Q) of the filter
• High Shelf
  +/- 15dB Shelf or Peak selectable at 8 kHz or 16 kHz
• HPF
  12 dB/octave high pass filter with a fixed 80 Hz frequency
• Transformer I/O
  Built around Ruperts custom transformers, designed especially for the 500-Series format

Rupert Neve Designs 551 Specifications:

• Equalizer Bypassed
• Noise:
  Measured at Main Output, un-weighted, 22Hz-22kHz, source impedance 40 Ohms
  balanced.
  Better than -102dBV
• Frequency Response
  Main output, no load
  +/- 0.1dBu from
  20Hz to 31.5kHz
  -1dB @ 120kHz
• Maximum Output Level
  23.25dBu
• Total Harmonic Distortion and Noise
  @ 1kHz, +20dBu output level, no load.
  Better than 0.0025%
  @ 20Hz, +20dBu output level, no load.
  0.13% Typical (2nd and 3rd harmonic)
• High Pass Filter:
  -2.7dB @ 80Hz
  Slope:
  12dB/Octave
• Equalizer Engaged
• Noise:
  Measured at Main Output, un-weighted, 22Hz-22kHz, source impedance 40 Ohms balanced.
  Better than -94dBV
• Frequency Response
  Main output, no load
  +/- 0.25dBu from 20Hz to 45kHz
  -2dB @ 120kHz
• Maximum Output Level
  23dBu
• Total Harmonic Distortion and Noise
  @ 1kHz, +20dBu output level, no load.
  Better than 0.009%
  @ 20Hz, +20dBu output level, no load.
  0.13% Typical (2nd and 3rd harmonic)
• Power Requirements
  120mA on +16VDC
  110ma on -16VDC

Made in USA