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551

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Description

500 Series lnductor EQ

The 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.

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

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