Ashly INSTRUMENT PREAMP SC-40 - Manual (Page 4)

A. GAIN
The GAIN control adjusts the gain of the input stage of
the SC-40 to accomodate a wide range of input levels. Start
with this control at its minimum setting and increase as
necessary. Decrease the gain if the "peak" indicator
illuminates unless deliberate overdrive is desired.
B. EQUALIZER
The six equalizer controls are divided into three bands.
Each band has a boost-cut and a frequency control. The low
and high bands have a "shelving" type action, meaning that all
frequencies below the low setting and above the high setting are
affected by the boost-cut control. The mid equalizer ia a
"peaking" type, having maximum effect at the mid frequency
setting and less effect on lower and higher frequencies.
Equalization settings will vary widely depending on the type
of instrument, speakers and cabinets used, and the type of
sound desired. It is always a good idea to start with a "flat"
setting as a reference and adjust from this point.
C. PRE-POST
This switch selects the signal sent to the PA outputs. The
PRE position provides a "flat" signal to the PA regardless of the
SC-40 equalizer settings, v/hile the POST position includes
the equalizer in the PA signal. Mote that this switch affects
only the PA outputs and that the STAGE signal is always equalized
As a general rule, use the PRE position if the PA or studio
console has a good input tone control, and use the POST position
if it does not.
D. LEVEL
These two controls independently adjust the levels of the
signals at the PA and STAGE outputs. They should be adjusted to
the desired level after the GAIN and EQUALIZER controls are set.