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Clip LED
BK-1632 STEREO MIXER
set to their designated normal operating points, the
circuits in the board are optimized for minimum
noise and distortion. In other words, the signal
levels are high enough to keep noise from creep¬
ing in and low enough to ensure plenty of
headroom and freedom from clipping distortion. If
the fader must run wide opten to get enough level,
turn up the TRIM control or increase the setting'of
the left and right submaster controls. Conversely,
if the fader must be pulled way back to get the right
level, the TRIM control or stereo submasters should
be adjusted. Adjust the TRIM control if the CLIP
LED lights, otherwise adjust the stereo submasters.
For optimum performance, the channel FADERS
(sec. 1H) should be run close to the "0" mark.
II.
CLIP LED
The channel CLIP LED monitors the input channel
circuit for clipping or overload (both before and
after the EQ section). If it lights, you are bordering
on distortion. You'll hear this in the output as a
harsh, blaring sound on volume peaks This might
be caused by excessive boost in the channel
equalization controls (sec. IB), or a TRIM control
setting that is too high for the input signal (sec. 1 A).
Generally, readjusting the TRIM control (sec. 1A)
will suffice.
1J.
CHANNEL
PATCHING
INSERT
JACK
(one supplied with the unit)
This space saving (two-connectors-in-one) jack
allows you to add external signal processing gear
to a particular channel, without disturbing any of
the other channels. A 3-conductor (stereo) phone
plug is used for both the output from the channel
preamp, and for the return to the mixer's output
stages from the external processing device. The
diagram indicates how a channel patching cord
should be wired. This cable can also be purchas¬
ed from any of several audio cable manufacturers.
HOW TO WIRE A CHANNEL PATCHING CORD
The channel patching jack can be used with
equalizers, limiters, compressors, external reverb
or dealy systems and the like. Just be sure the
device you want to patch in has line level unbalanc¬
ed inputs and outputs. The signal at the insert jack
can drive loads of 2,000 ohms or greater, and the
external processing device should have a low out¬
put internal impedance (100 ohms or less).
A nominal input signal is a level of +4 dBu; the
maximum level is +20 dBu.
FIGURE 2 — Output Section Controls
and Functions
six
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