Inputs
The
Listen Four
Quarters
has four input channels on the front. A fifth stereo channel can be
accessed through a header on the back.
Level Knobs
All four channels have a
Level
knob. This knob sets the volume which will appear on the
outputs. The
Listen Four
Quarters
is very quiet, so turning the knob all the way down will
completely mute the channel (over -100dB of attenuation, typically).
Channel Signal Lights
All four channels have a signal light which gets brighter as the signal gets louder. The color of
the light indicates the stereo content: blue displays the signal on the left channel, and green
displays the signal on the right channel. The signal light shows the signal post-fader (after the
Level
knob). These lights are useful for determining which channels are active at any given
moment. However, they should not be used as precision indicators. For example, the green
lights will appear dimmer than the blue lights at low audio levels and brighter than the blue
lights at louder levels.
Channels 1 and 2: Panning
Channels 1 and 2 each have one input jack and a
Pan
knob. These channels accept a mono
signal. Turning the
Pan
knob to the left or right will place the signal in the stereo field by
fading it between the left and right outputs. The
Pan
knob has a small detent in the center
position so you can find the center by feel.
The panning curve has been carefully designed to achieve the perception of a sound source
being a consistent distance from the listener as it pans around.
Channels 3 and 4: Stereo inputs
Channels 3 and 4 each have left and right input jacks. Patching a stereo signal into these
jacks will accurately maintain the stereo image as the signal is mixed into the outputs. If you
patch a mono signal into the left jack and nothing into the right jack, the mono signal will
appear on both left and right outputs.
Channel 5: INS header
See
INS header
section below
Main Outputs
Main Level Knob
The
Main Level
knob controls the volume of the main left and right output jacks. When knob
is turned fully to the left, the outputs are muted. Turning the knob the to right increases the
volume.
Left and Right Output Jacks
The main outputs of the module are the
left and right output jacks. The signal level on these
jacks is controlled by the
Main Level
knob and designed to drive line-level equipment. These
jacks have a zero-impedance balanced line driver circuit capable of driving long cables. The
jacks are TRS 1/4” (6.35mm) and will output a balanced signal. Using a mono cable with
either jack will disable the balanced circuitry and a mono signal will be output. The switch
must be set to
Balanced
if mono cables are used, or else the right channel will be muted (see
Stereo TRS/Balanced Switch
section below).
The signal will never clip because the
Listen Four Quarters
inputs modular-level signals
and outputs line-level signals. Thus the overall gain is less than one.
Page of
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7
Level 1
Level 1
Pan 1
1
Main
L
R
Always flip the switch to Balanced when using mono
(TR) cables, or else the right channel will be muted.
