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DESCRIPTION
FRONT PANEL
CHANNEL A
0 10
RA900
CHANNEL B
0 10
PROTECT
CLIP
SIGNAL
POWER
POWER
POWER: Applies power to the RA900 when connected to a properly grounded
and powered ac outlet.
CHANNEL 1 / 2 LEVEL CONTROLS: Adjust the output level of the indicated
channel. When in Bridged mode, Channel 1 control adjusts the output level.
POWER LED: Indicates the RA900 is connected to an ac outlet and the power is
on.
SIGNAL LED: indicates that signal is present in the indicated channel.
CLIPLED: Indicates overload in the indicated channel
PROTECT LED: Indicates that the indicated RA900 channel has gone into
PROTECT Mode - the output will shut off.
REAR PANEL
LOW-CUT SWITCHES INPUTS ST/BRDGE SWITCH FUSE
INPUT
BAL
B
A
Channel B
Channel A
INPUT
THRU
B
A
CAUTION
MINIMUM LOAD IMPEDANCE
2 OHMS PER CHANNEL
4 OHM BRIDGE
FUSE
15A/120V
- BRIDGE MONO +
POWER AMPLIFIER
+
-
+
2
-
3
1
23
4
BA
1
4
2
3
LOW
CUT FILTER
ON=30Hz
OFF=50Hz
LOW
CUT FILTER
ON=30Hz
OFF=50Hz
1
GROUND
LIFT
AMP MODE
STEREO BRIDGE
THRU OUTPUTS GND LFT PWR
LOW-CUT SWITCHES: Connects or disconnects the low-cut filters.
INPUTS: XLR and 1/4” TRS input jacks.
ST/BRDGE SWITCH: Selects either Stereo or Bridged mode.
FUSE: Contains the 12A 250V fuse
THRU: Male XLR jacks - hard-wired to the input jacks.
OUTPUTS: 5-Way binding post output terminals
GND LFT: Connects or disconnects the ouput ground to chassis ground.
PWR: Connects to the power cable.
OPERATION
STEREO
IN IN
INPUT
BAL
B
A
Channel B
Channel A
INPUT
THRU
B
A
CAUTION
MINIMUM LOAD IMPEDANCE
2 OHMS PER CHANNEL
4 OHM BRIDGE
FUSE
15A/120V
- BRIDGE MONO +
POWER AMPLIFIER
+
-
+
2
-
3
1
23
4
BA
1
4
2
3
LOW
CUT FILTER
ON=30Hz
OFF=50Hz
LOW
CUT FILTER
ON=30Hz
OFF=50Hz
1
GROUND
LIFT
AMP MODE
STEREO BRIDGE
BRIDGED
IN
INPUT
BAL
B
A
Channel B
Channel A
INPUT
THRU
B
A
CAUTION
MINIMUM LOAD IMPEDANCE
2 OHMS PER CHANNEL
4 OHM BRIDGE
FUSE
15A/120V
- BRIDGE MONO +
POWER AMPLIFIER
+
-
+
2
-
3
1
23
4
BA
1
4
2
3
LOW
CUT FILTER
ON=30Hz
OFF=50Hz
LOW
CUT FILTER
ON=30Hz
OFF=50Hz
1
GROUND
LIFT
AMP MODE
STEREO BRIDGE
CONNECTION
Connect the amplifier in either Stereo or Bridged Mono mode as shown above.
Turn the unit off before making any connection changes.
INPUTS
The RA900 inputs are XLR balanced, or 1/4” unbalanced.
OUTPUTS
The output terminals take a standard banana type plug, or they may be un-
screwed so the end of the wire may be stripped and inserted into the hole on the
top of the terminal - then tightened.
GROUND LIFT
The Ground Lift switch has been provided to disconnect the circuit ground from
chassis ground. This may help eliminate unwanted ground hum or buzz.
OPERATING VOLTAGE
The serial number of your RA900 will indicate the correct AC operating voltage.
Connecting the unit to the wrong voltage may damage the amplifier.
LOW CUT FILTER
The Low Cut Filter removes ultra-low frequency content from the audio signal that
could possibly damage or cause distortion in a loudspeaker system. The DIP
switch on the rear panel enables or disables the filter independently for each
2 3