Classic sound for your 500 rack.
With a big, bold preamp, a swept high-pass filter and the powerful saturation control of variable Silk, the 511 combines legendary Rupert Neve tone with 500 Series value.
 
SPECIFICATIONS
 
NOISE
Measured at Main Output, un-weighted, 22 Hz - 22 kHz, source impedance 150 Ohm balanced. Noise performance can vary depending on the 500 series and / or interference from stray magnetic fields.
Unity Gain: Better than -103 dBV
Gain @ +66 dB: Better than -60 dBV
Equivalent Input Noise: -125 dB
FREQUENCY RESPONSE
Main output, no load.
+/- 0.1 dBu from 10 Hz to 31.5 kHz
-2.6 dB @ 120 kHz
MAXIMUM OUTPUT LEVEL
+23 dBu
TOTAL HARMONIC DISTORTION AND NOISE, NO SILK
@ 1 kHz, +20 dBu output level, no load: Better than 0.0025%
@ 20 Hz, +20 dBu output level, no load: 0.025% Typical (2nd and 3rd harmonic)
TOTAL HARMONIC DISTORTION AND NOISE WITH SILK ENGAGED 
@ 100 Hz, +20 dBu input level, no load.
TEXTURE @ min: 0.015%, mostly 3rd harmonic typical
TEXTURE @ max: 2%, mostly 2rd harmonic typical
GAIN
Unity up to +66 dB in 6 dB steps.
Trim continuously adjustable from -6 dB to +6 dB.
PHANTOM POWER
Supplied by the 500 series rack power supply. Switch selectable on faceplate.
HIGH PASS FILTER
Continuously variable swept frequency from 20 Hz to 250 Hz.
Slope: 12 dB/Octave
POWER REQUIREMENTS
@ +/-16VDC, 100mA