Rupert Neve 551 - 500 Series Inductor EQ - Manual (Page 6)

LF
Adjusts up to 15 dB of boost or cut at the selected low frequencies. Cut can be used
as a variable, and perhaps more gentle alternative to using the HPF.
OUTPUT
The main output signal comes from the output transformer secondary which is
balanced and ground free. A ground free connection guarantees freedom from
hum and radio frequency interference when connected to a balanced destination.
POWER
+/- 16V supplied by 500 series rack
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