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OUTPUT
CK
LO
CK
LO
STEREO
BRIDGE
MONO
EQ
C
H
A
N
N
E
L
A
C
H
A
N
N
E
L
B
BASS BOOST
FREQUENCY (Hz)
120
63
140
43
180
OFF
LOW
CUT
SUB
LOW
CUT
OFF
SUB
OFF
ON
B
R
I
D
G
E
FREQUENCY (Hz)
120
63
140
43
180
CHANNEL
CHANNEL
1+
1-
&
STEREO/MONO
2+
2-
BRIDGE
INPUT
0
10
CLIP
SIGNAL
PROTECT
POWER
BASS BOOST
CH A
0
10
CH B
O
I
POWER
2
3
INTRODUCTION
INSTRUCTION MANUAL - STEREO POWER AMPLIFIERS
WARNING :
THIS UNIT MUST BE EARTHED.
KEEP WELL VENTILATED.
Thank you for purchasing the Studiomaster Professional RAX series amplifier. These RAX series amplifier incorporate
Studiomaster Professional renowned technological expertise, and offers high reliability, rock-solid stability, and superb
acoustic characteristics.
INSTALLATION
• Connect this unit’s power cord only to an AC outlet of the type stated in this Instruction Manual or as marked on the unit.
Failure to do so is a fire and electrical shock hazard.
• Do not allow water to enter this unit or allow the unit to become wet this may result in Fire or electrical shock.
• Do not place a container with liquid or small metal objects on top of this unit. Liquid or metal objects inside this unit are a fire
and electrical shock hazard.
• Do not place heavy objects, including this unit, on top of the power cord. A damaged power cord is a fire and electrical shock hazard.
• Be sure to connect to an appropriate outlet with a protective grounding connection. Improper grounding can result in
electrical shock.
OPERATION
FEATURES
• Do not scratch, bend, twist, pull, or heat the power cord. A damaged power cord is a fire and electrical shock hazard.
• Do not remove the unit’s cover. You could receive an electrical shock. If you think internal inspection, maintenance, or repair
is necessary, please contact your dealer.
For correct operation
Connector pin assignments
• XLR-type connectors are wired as follows Pin 1: ground; Pin 2: hot (+); in 3: cold (-)
Always turn the power off when the amplifier is not in use.
Illustrations in this manual are for explanatory purposes only, and may not match the actual appearance of the product during operation.
• Do not modify the unit. Doing so is a fire and electrical shock hazard.
• If lightning begins to occur, turn off the power switch of the unit as soon as possible, and unplug the power cable plug from
the electricity outlet.
• If there is a possibility of lightning, do not touch the power cable plug if it is still connected. Doing so may be an electrical
shock hazard.
• With two types of input jacks (balanced XLR & 1/4” Jack) and 2 types of output jacks, (Speakon, binding post). These amplifiers
are suitable for a wide variety of applications and installed systems.
• The unit offers three operating modes: STEREO (where Channels A & B operate independently), MONO (where the unit
outputs a mono source though twin amplifier systems), and BRIDGE (where the unit operates as a single high-power amplifier)
• Each channel is equipped with an independent LOW CUT/SUB WOOFER switch-where LOW CUT engages a high-pass filter,
and SUB WOOFER engages a low-pass filter. With LOW CUT or SUB WOOFER selected, you can adjust the cutoff frequency
from 43Hz to 180Hz.
• The PROTECTION indicator lights up-and sound output is automatically muted-whenever the unit’s protective circuitry is
operating i.e. thermal and DC protection.
• Each channel has a common bass boost switch, when turned ON, the amplifier adds low-frequency compensation so that
the speaker output is enhanced.
FRONT PANEL
• Each channel has its own SIGNAL and CLIP indicators.
• Variable-speed low-noise fans ensure the amplifiers run cool.
2. Balanced 6.3 mm jack input - This stereo jack connector takes the signal (balanced/unbalanced) for driving the channel. If the signal
is unbalanced, a mono connector may be used.
1. Balanced XLR input - This XLR connector takes the signal (balanced/unbalanced) for driving the channel. If the signal is unbalanced,
pin 2 can be used for the signal and pin 3 connected to the earth.
5. Bass Boost Switch - If you set this switch ON, the amplifier adds low-frequency compensation so as to enhance speaker output. The
results (the actual change in the low-frequency balance) will vary according to the speaker type. Note that this switch is effective only
if the FILTER switch is set to OFF.
6. Configuration Switch - This 3 way switch configure the amp for the three working modes Mono, Stereo and Bridge.
7. Output Binding Post - Use this output for picking up the amplified signals individually for stereo mode & in combination for bridge
mode.
8. Speakon connector for CH A to CH B - Use this connector to pick amplified output of CH A & CH B.
9. Fuse holder socket. Replace fuse with same type & rating.
10. Power cable - Use this cable for supplying power to unit.
3. Frequency adjustment knob - When the EQ is selected between Low Cut & Sub woofer, use this knob to adjust the frequency.
4. Filter Switch - Use this switch to select the filter type. SUB WOOFER......Use a low-pass filter. The amplifier outputs the frequencies
that are lower than the cut-off set by the FREQUENCY adjustment knob. LOW CUT......Use a high-pass filter. You can use this setting
to filter out unneeded low or subsonic frequencies.
11.
External earth terminal: For a possible ground connection (e.g. in case of hum problems).
1. Power ON/OFF switch
2. Power on/off LED indicator
3. Protect indicators for CH A & CH B
4. CH A & CH B gain control
5. Signal LED indicators for CH A & CH B
6. Clip LED indicators for CH A & CH B
7. Bass boost indication
REAR PANEL
6
4
5
1
3
2 7
XLR CONNECTOR
STEREO JACK 6.3mm 1/4”
3 6
1
2
9
10
11
4
5
8
7
