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100M ENTERTAINER STEREO MIXER
OWNER'S MANUAL
By
100M ENTERTAINER
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Pictorial 2 - Dual-Display Meter Diagram
METER SECTION (refer to the Dual-Display Meter
Diagram, Pictorial 2)
1. LEFT AND RIGHT BARGRAPH DISPLAY:
The
meter section uses a dual-channel fluorescent
bargraph display. The display is calibrated so that 0
VU on the display corresponds to +4 dBu (1.23 V
rms) at the Stereo or Monitor outputs (depending on
the setting of the MODE switch) and + 3 VU on the
display corresponds to the 100-watt (8-ohm) output
from the internal power amplifiers.
The meters monitor the output of the graphic
equalizers. The actual sources monitored depend on
the setting of the MODE switch.
Depending on the setting of the MODE switch, the
meter will indicate two different situations:
If, the MODE switch is in the In position, the left
bargraph will indicate the main output level, while the
right bargraph will indicate the monitor output level.
If the MODE switch is in the Out position, the left
bargraph will indicate the left stereo output level,
while the right bargraph will indicate the right stereo
output level.
2. LEFT AND RIGHT MAXIMUM POWER IN¬
DICATORS: These indicators signal the activation of
the anti-clipping circuit. The output of each amplifier
is monitored individually for clipping (distortion) con¬
ditions. When clipping is detected, the amplifier gain
is automatically reduced just enough to keep the
amplifier output from clipping. If the input signal
should increase further, the gain is reduced further,
but just enough to prevent clipping.
Occasional blinking of the indicators is normal. Sus¬
tained operation of the indicators, while not harmful
in itself, is an indication of amplifier overdrive (operat¬
ing the system beyond its limits) and should be ad¬
justed. With the indicators on continuously or most
of the time, the 100M will not get significantly louder,
regardless of how much travel is left on any of the
volume controls. One possible cure is to simply turn
the master volume down. Another possibility is to ob¬
tain additional power amplifiers and speakers if more
volume and/or coverage are needed.
Remember, the MAXIMUM POWER LEDs do not in¬
dicate amplifier clipping, rather, they indicate the ac¬
tivation of the protection circuitry. If it weren't for the
protection circuitry, the signal would have been
clipped, causing distortion.
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