5
C O N T R O L S A N D C O N N E C T I O N S
(1)
1. CHANNEL SECTION
(1) INPUTS
The electronically balanced XLR and 1/4” TRS inputs are designed to accept
signals from any balanced or unbalanced low impedance (Low Z) microphone
or line level source such as those from keyboards, drum machines, or
samplers. To accommodate condenser microphones, the XLR input is also
equipped with +48VDC phantom power globally switchable to all XLR input
jacks with the
Phantom Power Switch (30
). Dynamic or ribbon-type
microphones do not require phantom power. The 1/4” and XLR inputs are
configured as follows: Sleeve/Pin1 = ground, Tip/Pin2 = positive (+), Ring/Pin3 =
negative (-).
The Stereo Channel 7/8 has two RCA input jacks or a 1/4” TRS stereo jack
wired Sleeve = ground, Tip = Left, Ring = Right. These can be connected to
CD or MP-3 players or to any line level signal source.
[Note: Do not connect mics when phantom power is already switched on, as
indicated by the
Phantom Power LED (13)
in the Master Section of the top
panel. Never use unbalanced mic cables with the Phantom Power switched on.
Never short the +48VDC to ground, as that can cause serious damage to your
mixer. Also, turn down the
Master Stereo Volume Faders (23)
to prevent
possible sharp transient noise from damaging the speakers when turning the
phantom power on or off.]
(2) MIC / LINE LEVEL SELECTOR
This button can be used to select the appropriate input level for your channel,
enabling over 30dB of gain when set to Mic Level. When using microphones or
very low level devices such as guitars, Mic should be selected. Set the switch
to Line when using line level inputs such as keyboards, drum machines. If the
signal input is not strong enough when in Line Level mode with the
Trim (3)
at
max, try turning down the Trim and setting to Mic Level. Conversely, if the input
keeps clipping and distorting, causing the
Peak LED (5)
to light when in Mic
Level mode with the Trim set to minimum, try changing the switch to Line Level
and turning up the Trim.
Stereo Channel 7/8 and the AUX Return have a -20dB attenuator switch for
optimum input signal management.
(3) TRIM CONTROL
The Trim control adjusts the input sensitivity (channel gain) of the Mic and Line
input signals on the channels. This control can be adjusted to accommodate
input signals of a wide variety of sources, from the high outputs of keyboards or
drum machines to the small signal outputs of microphones. The Trim control
adjusts the input sensitivity with 30dB of range. The best balance of S/N and
dynamic range will be achieved if you adjust the Trim control on each channel
separately so that the
Channel Peak LED (5)
for that channel almost lights.
(4) LOW CUT FILTER
Use this Low-Cut (high-pass) filter (18 dB/octave, -3 dB at 75Hz) for reducing
floor rumble, popping, breathing noises, woolly bottom end, and to tighten up
channels in a mix, etc. It is most effective when used carefully in conjunction
with the
Equalizer Controls (6)
.
(5) CHANNEL PEAK LED
The Peak LED illuminates when a channel input is overloading. It detects the
peak level after the
Equalizer Controls (6)
and will light just before clipping to
warn that the signal is approaching overload. You do not want the Peak LED to
light except very intermittently. If it lights persistently, reduce the
Trim Control
(3).
(2)
(3)
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(5)
