Rupert Neve Shelford 5052: Mic Pre / Inductor EQ - Manual (Page 9)

button is out. When the MID HI Q is pressed at maximum boost, the Q narrows
to approximately 3.5. The Q widens nicely with less boost or cut as is typical for
passive EQ circuits. The Q tends to be slightly wider when the frequency is set
lower, and slightly higher for higher frequency selections. The Q is also narrower
for cuts than it is for boosts and the mid band is non-symmetrical by design.
MID LEVEL
Adjusts up to 15 dB of boost or cut at the selected mid frequencies. Remember to
reduce the signal level at the source to minimize the potential for distortion when
any of the 3 bands are boosted significantly.
HPF
The HPF switch engages a 12dB per octave high pass filter. The HPF potentiometer
is variable from 20Hz to 250Hz, and can be used to filter out unwanted low
frequencies, or in conjunction with the EQ to help shape source material.
LOW FREQ
The LOW FREQ rotary switch has 4 positions for selecting one of four corner or
center frequencies for the low band EQ section. The frequencies are 35 Hz, 60 Hz,
100 Hz and 220 Hz.
LF PEAK
When the button is out, the low frequency band operates in shelf mode, boosting
or cutting below the corner frequency. Above the corner frequency the amount of
boost or cut gradually diminishes at approximately 6 dB/octave. With the HI PEAK
button pressed the low frequency band changes to peak mode with a bell shaped
boost or cut curve. Between the LF PEAK button and LF FREQ rotary switch, an
engineer has 8 tonal variations of EQ shapes to finesse the bottom end, plus the
high pass filter can be introduced for further tightening and manipulation.
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. Remember to
reduce the signal level at the source to minimize the potential for distortion when
any of the 3 bands are boosted significantly.
SILK / TEXTURE
Pushing the Silk button cycles the silk modes from red silk to blue silk to off. Silk
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. Blue Silk
accentuates low frequencies. By manipulating the Texture control, the amount of
Silk can be changed from essentially absent, to roughly 4-5% THD (mostly second
order) depending on how hard the output transformer is being driven.
LEVEL METER
Displays the final peak output level of the 5052. In the case of feeding the 5052
into A to D converters, one should primarily depend on the converters own meters