Rupert Neve Designs 551 500 Series Inductor EQ

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.

Neve’s 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 Rupert’s 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 EQ’s are built around custom-wound Inductors and are based on our favorite bands from Mr.

Neve’s 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 Rupert’s 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.