Crest Audio UMA 4300, Owner'S Manual

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PROFESSIONAL SERIES INSTALLATION POWER AMPLIFIER
UMA 4300
LEVEL
1 2 3 4 MASTER
POWER
SIGNAL
PEAK/MUTE
SIGNAL
ACL/MUTE
min max min max min max min max min max
TM
Front Panel
1 7
2
3 4
6
5
(1) Input Channel Level Controls
These rotary controls set the channel signal level sent to the mix bus. It is best set in the 12:00 to 2:00 range as indicated
on the front panel. The preamp gain control should then be adjusted for proper operating level.
(2) Input Channel Peak/Mute indicators
These red LEDs perform a dual purpose of indicating that the corresponding channel is muted and when the input signal
is too high and distortion can occur. To correct the problem, lower the corresponding channel gain control.
(3) Input Signal Indicator (SIG)
These LEDs illuminate green to indicate signal presence on the corresponding input.
(4) Output Signal Indicator (SIG)
These LEDs illuminate green to indicate signal presence to the mixer output master.
(5) ACL/Mute Indicator
This LED will illuminate red when the signal in the power amplifier reaches the point where the ACL circuit (Automatic
Clip limiter) engages. The ACL circuit reduces the gain automatically when necessary to prevent amplifier clipping. It
will also illuminate red when a switch closure is present on the Mute All input causing all signals through the amplifier to
be muted.
(6) Master level control
The master control sets the overall signal level of the system. It is best set in the 12:00 to 2:00 range as indicated on the
front panel.
(7) Power Indicator
This LED illuminates when powered and active.