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Guided Tour - S83 Main Section
1: Meter - This seven-segment bar meter shows the continuous output level of
the S83. For optimum signal-to-noise ratio, try to adjust all levels (channel and
main) so that program material is usually at or around 0 VU, with occasional but
not steady excursions to the +2 segment. See the “Setting Up and Using the
S83/S63” section in this manual for more information.
2: Meter LEDs - These show the status of various conditions within the S83.
The leftmost LED (labeled “Phantom”) lights steadily when Phantom power is
being supplied to all mic inputs (see #5 below). The center LED (labeled
“Protection”) lights for approximately five seconds whenever the S83 is powered
on and fades slowly when the unit is powered off. It indicates the activity of the
built-in protection relay circuitry during which time 0 volts DC are provided to all
connected speakers, thus preventing any “thump.” The rightmost LED (labeled
“Power”) lights steadily whenever the S83 is powered on.
3: Ten-Band Graphic Master EQ - These sliders allow you to add ±15 db of
boost or attenuation to ten different frequency areas, affecting the main output
signal of the S83. When a slider is at its center detented (“0 db”) position, the
selected frequency area is unaffected (it is said to be flat). When a slider is
moved up (above the “0 db” position, towards the “+15 db” position), the selected
frequency area is boosted, and when it is moved down (below the “0 db” posi-
tion, towards the “-15 db” position), the selected frequency area is being attenu-
ated. For more information, see the “Using Equalization” section in this manual.
4: Main Level (white) - This knob determines the final signal level sent to the
speaker output jacks on the rear panel. At the fully counterclockwise (“∞”) posi-
tion, the signal is infinitely attenuated—that is, there is no sound. At the “0” posi-
tion, the mixer is at unity gain and is providing no attenuation or boost to the
8 CHANNEL MIXER 300 WATT AMPLIFIER
-18 -12 -8 -5
-3
0+2
PHANTOM PROTECTION POWER
30Hz 64Hz
125Hz 250Hz 500Hz 1K
2K
3K 5K 10K
+15dB
0dB
-15dB
30Hz 64Hz
125Hz 250Hz 500Hz 1K
2K
3K 5K 10K
PHANTOM
+10
RETURN 1-2
0
MAIN LEVEL
+10
RETURN 3-4
0
0
10
HEADPHONES
0
10
REVERB
−∞
+10
MONITOR
0
−∞
−∞
1
2
3
4
5
8
9
11
7
10
6
+10
0
−∞
6