Rupert Neve 551 - 500 Series Inductor EQ - Manual (Page 7)

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
Low Frequency EQ
Color Sweep Trace Comment
1 1 Red EQ Flat
2 1 Cyan 35 Hz Full Boost
3 1 Cyan 35 Hz Full Cut
4 1 Green 60 Hz Full Boost
5 1 Green 60 Hz Full Cut
6 1 Magenta 100 Hz Full Boost
7 1 Magenta 100 Hz Full Cut
8 1 Red 220 Hz Full Boost
9 1 Red 220 Hz Full Cut
-20
+20
-15
-10
-5
+0
+5
+10
+15
d
B
u
10 200k 20 50 100 200 500 1k 2k 5k 10k 20k 50k
Hz