Crest Audio WMA 4300, Руководство пользователя

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(12) Line Voltage Selector Switch
The line voltage select should be checked and set to match the mains voltage before connecting and operating this unit. The
WMA 4300 can be operated at 100V-120 VAC or 220-240 VAC 50/60 Hz.
(13) Outputs
A direct output and transformer outputs are provided to allow proper interface between the amplifier and the loudspeaker
system. Connect the loudspeaker system to the appropriate output connector and the COM terminal. Connections for 4
Ohm, 25 Volt, 70 Volt and 100 Volt systems are available.
(14) Line Output
The balanced line output with level control can be used to extend the mixer to other power amplifiers, provide a monitor
output, or send background music to a phone system etc. The output source is selectable (see output source selector below)
(15) Output Source Selector
The signal sent to the line output can be selected to be either the main mix or the input 4 signal.
(16) Low EQ (Bass)
This rotary control varies low frequency response from +10 dB to -10 dB at 100 Hz. It is a
shelving-type active control and delivers a flat response in the center “0” position.
(17) High EQ (Treble)
This rotary control varies high frequency response from +10 dB to -10 dB at 10 kHz. It is
a shelving-type active control and delivers a flat response in the center “0” position.
(18) Balanced Input Connectors (Inputs 1 - 4)
The electronically-balanced, variable-gain, input will accept both line and mic level signals and has an input impedance of 3.3
k Ohms.
(19) Preamp Gain Controls
The preamp gain controls adjust the sensitivity of the 4 inputs allowing microphone and line level signals to be connected to
the WMA amplifier. Begin by setting the gain at minimum (full CCW). Set the master level and channel level controls on the
front panel in the 12:00 to 2:00 range. Adjust the preamp gain for proper signal level through the system. The Green signal
LED should flash and the Red PK LED should not light.
(20) Threshold Control
Channel 1 is the controlling channel of the priority mute system. When the level of the signal on channel 1 exceeds the
threshold set by the Mute Threshold control, channels 2-4 are muted. Setting this control at the full counter-clockwise
position defeats the muting function.
(21) Phantom Power +48V
There are two phantom power switches. The first turns on +48V phantom power for input 1, the second for inputs 2 and 3.
(22) Mute All
Connecting the two terminals on the mute all input connector, mutes all audio through the WMA 4300. This may need to be
connected to a fire alarm system, for example, to mute audio in case of emergency.