Rupert Neve 511 - 500 Series Mic Pre with Silk - Manual (Page 8)

8
+48V
Engages phantom power on the microphone input, as supplied by the 500 series
rack.
POLARITY
Push button inverts the polarity of the signal path, and illuminates when engaged.
The symbol “Ø” is often used to denote opposite polarity.
HIGH PASS FILTER
The high pass filter is continuously variable from 20-250Hz and engaged by the
HPF switch, which illuminates when engaged. It is a valuable aid in any signal
chain, but particularly so in a microphone preamplifier. Signals below the selected
frequency are attenuated at a rate of 12db / octave, getting rid of proximity effect,
building rumble, air handling, motor hum, etc.
SILK / TEXTURE
Pushing the Silk button engages the red Silk circuit, which reduces the negative
feedback on the output transformer, adding harmonic content as the texture is
increased. Red Silk accentuates the saturation in the mid and high frequencies,
similar to that of the red silk mode on the Portico II Channel. By manipulating
the Texture control, the amount of Silk can be changed from essentially absent,
to roughly 10 times the amount of coloration / distortion found in Silk from the
original Portico Series. With Silk / Texture engaged, the distortion characteristic
and harmonic content of the unit are very reminiscent of many of Rupert’s class-A
vintage designs. The Silk button illuminates red when engaged.
LEVEL METER
An Eight-segment LED bar-graph meter displays output level (pre-Silk). The color
range proceeds from green for lower level signals, yellow for intermediate signals,
and red for high levels. When the 511 is clipped, the highest red LED will hold
longer depending on how far above the clip threshold the signal was.
SPECIFICATIONS
NOISE :
Measured at Main Output, un-weighted, 22Hz-22kHz, source impedance 150
Ohms balanced. Noise performance can vary depending on the 500 series and / or
interference from stray magnetic fields.
Unity Gain Better than -103dBV
With Gain @ +66dB Better than -60dBV
Equivalent Input Noise -125dB
FREQUENCY RESPONSE
Main output, no load
Main Output +/- 0.1dBu from 10Hz to
31.5kHz
-2.6dB @ 120kHz