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Q
INPUT
LEVEL
SWITCH
AND
LED
PEAK
INDICATOR
The
Input
Level
switch
changes
the
input
sensitivity to
accommodate
nominal input levels of —60, —50, —35, —20;
—10
or +4dB.
Respectively, these levels correspond
to low
level dynamic or ribbon
mics,
medium
and high level con-
denser
mics, preamplified
electric instruments, and low or
high line level audio processing or mixing equipment.
Adjacent to the switch is a red LED indicator that helps the
operator determine the proper Input Level setting. The LED
turns On before the preamplified input signal is high enough
to cause overdrive distortion (i.e., whenever the level exceeds
3dB below clipping).
To establish the Input Level switch setting that yields the
best
combination
of maximum
headroom
and
minimum
noise characteristics, first set the switch to +4dB
position. -
Then apply a typical input signal to that channel (e.g., talk or
sing into the microphone, play the instrument to which the
channel
is connected, etc.). Turn the Input Level switch to
more sensitive settings (toward the "—60" end of the scale)
until the red LED flashes only occasionally.
If the red LED
flashes often or stays On, reduce
the Input
Level
switch
sensitivity (turn it up toward the "+4" end of the scale).
NOTE:
The
input Fader
has no effect on this LED.
The
LED monitors the level after the Input Level switch,
but before the Fader.
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INPUT SELECTOR
PUSHBUTTON
(А-В)
Two separate inputs are provided for each channel, a low-
impedance
XLR-type
connector
(input "A")
and a high
impedance phone jack (input "В"), The Input Selector push-
button
determines
which
of the channel's
two
XLR-type
connectors, A or B, actually supplies the audio signal to the
channel. (The Input Level switch sets the sensitivity of both
inputs.)
To select the XLR-type connector, the button should be up;
to select the phone jack, press the button down.
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