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IMPORTANT SAFETY INSTRUCTIONS
When using this electronic device, basic precautions should always be taken, including the
following:
1. Read all instructions before using the product.
2. Do not use this product near water (e.g., near a bathtub, washbowl, kitchen sink, in a wet
basement, or near a swimming pool.etc).
3. This product must be used with a rack or stand alone, when you are sure that the amplifier
has a stable base.
5.This product, in combination with headphones or speakers, may be capable of producing
sound levels that could cause permanent hearing loss. Do not operate for a long period of
time at a high volume level or at a level that is uncomfortable. If you experience any hearing
loss or ringing in the ears, you should consult an otorhinolaryngologists. The product should
be positioned so that proper ventilation is maintained.
6.The product should be located away from heat sources such as radiators, heat vents, or other
devices (including amplifiers) that produce heat.
7.The product should be connected to a power supply only of the type described in the
operating instructions or as marked on the product. Replace the fuse only with one of the
specified type, size, and correct rating.
8.The power supply cord should be undamaged and never share an outlet or extension cord
with other devices so that the outlet's or extension cord's power rating is exceeded, and never
be left plugged in to the outlet when not being used for a long period of time.
9.Care should be taken so that objects do not fall into, and liquids are not spilled through, the
enclosure's openings.
10. The product should be serviced by qualified service personnel if:
The power supply cord or the plug has been damaged.
Objects have fallen into, or liquid has been spilled onto the product.
The product has been exposed to rain.
The product does not appear to operate normally or exhibits a marked change in
performance.
• The product has been dropped, or the enclosure damaged.
•
•
•
•
11. Do not attempt to service the product beyond what is described in the user maintenance
instructions.
All other servicing should be referred to qualified service personnel.
CONTENTS:
Before you start
What's in the box
Features
Hints on installation
4
4
4
Controls and connections
Front panel
Rear panel
Connections examples
5
6
7
Specifications
Specifications
9
Congratulations on your purchase stereo power amplifiers. This unit was developed using the
expertise of professional sound engineers and working musicians. You will find that your new 2A Series
has superior performance and greater flexibility than any other amplifiers in its price range. Please read this
manual carefully to get the most out of your new unit. Thanks for selecting 2A Series.
What’s in the box?
Items those are included in the box:
•
•
•
2A Series amplifier
Instruction manual
Power cable
Features
• Operating features:
volume controls;
balanced phoenix and XLR connectors, LINK
output, compressor, input sensitivity selector,
binding post and speakon output connectors,
stereo/bridge/parallel mode, ground lift switch.
• Safety/reliability features: 2 variable speed
fans for cooling, soft start, DC and thermal
overload protection; short circuit and speaker
protection.
• Indications: power ON, clip, signal, and
protect LED indicators for each channel. Bridge
and parallel indicators.
• Cabinet features: Roadworthy, rugged double
rack space (2 U) housing. Direction of cooling air
flow:
from
the
rear
to
the
front.
Hints on Installation
This user manual contains important information on operating 2A series amplifier correctly and safety. Please
read it carefully before operating your amplifier.
INSPECTION
Your 2A Series was carefully packed at the factory in packaging designed to protect the units in
shipment. Before installing and using your unit, carefully examine the packaging and all contents for any
signs of physical damage. If you find any damage, notify the shipping company immediately. Be sure to
save the carton and all packing materials for carrier inspection.
RACK MOUNTING
The 2A Series amplifiers are designed for standard 19" rack mounting as well as stand alone. Use 4 screws
and washers for mounting to the front rack rails. It is also a good idea to support the amps in the rear,
especially for mobile use where the amps will be subjected to strong vibrations.
AMPLIFIER COOLING
Also pay close attention to the cooling requirements. Never block the air vents in the back, side and front
of the amplifier. Do not install the amplifier in a location that is exposed to direct rays of the sun or near
the hot appliance or radiators. Installation of the amplifiers in a damp or dust environment may result in
malfunction or accident. Please make sure to open the back doors, if installed in a rack. Periodically
remove the internal dust by using compressed air thought the external ventilation holes.
Front Panel
1. PROTECT LED INDICATORS
These LEDs illuminate if the power amplifiers
output connection is shorted or the load
impedance is too low. When either of these
LEDs is lit up, turn OFF the power and check
the output's connection to verify that it is
correct, then turn ON the power again.
2. CLIP LED INDICATORS
These LEDs illuminate if any section of the
power amplifier's output are clipping.
Occasional blinking of the LEDs are
acceptable, but if they remain on more than
intermittently you should reduce the output
level to avoid audible distortion.
3. SIGNAL LED INDICATORS
These LEDs illuminate to confirm the input
signal greater than 100 mV at that channel of
the amplifier.
4. POWER LED INDICATORS
These LEDs illuminate when the power is
turned "ON".
5. BRIDGE LED INDICATOR
This LED illuminate when the amplifier is set
in to bridge mode. In bridge mode Input2 is
disabled, the input signal should be
connected in to input1. Both channel volume
controls are available. Please take attention in
to loudspeakers connection diagram in the
rear panel.
6. POWER SWITCH
To turn the unit ON or OFF, press this button.
Before turning on the amplifier, check all
connections and turn down the level
controls. A momentary muting is normal
when turning the amplifier on or off.
(Caution: Always turn on your power amplifier
last, after all your other connected
equipment, and always turn off your power
amplifier before your other connected
equipment.)
7. PARALLEL LED INDICATOR
This LED illuminate when the amplifier is set
in to parallel mode. In parallel mode Input2 is
disabled, the input signal should be
connected to input 1. Both channel volume
controls are available.
8. LEVEL CONTROLS
These knobs control the level of signal
coming into each channel. The actual gain of
the amplifier is shown in dB Scale. Turn these
controls counter clockwise if the clip LEDs
illuminate steadily. Set these knobs into the
min position before turning on amplifier.
Rear Panel
1. INPUT CONNECTORS
Connect your input signal to these balanced
phoenix or XLR connectors. Link connector
allows to have direct output from input
connector.
2. GND SWITCH
To eliminate a ground loop, set ground switch
to lift position and otherwise to connect a
ground to amplifiers chassis.
3. SENSITIVITY
There are 3 level of input sensitivity 0.7V, 1V
and 1,4V.
4. COMPRESOR
Set switch in to normal for disabling
compressor. The compressor is active then 1V
sensitivity is selected and switch is set to
compressor.
5. MODE SWITCH
There are available 3 modes of operation:
stereo, bridge and parallel. Don’t use this
switch then amplifier is turning on.
Stereo mode: This is general used mode. In this
mode both inputs require audio signal and
both volume controls are active. In stereo
mode Channel 1 and Channel 2 work
independently. The minimum loudspeakers
impedance should be no less then 2Ω.
Bridge mode: This mode combines the power
from both channels to drive a single
loudspeaker. In this mode only input1 require
audio signal but both volume controls are
active.
The
minimum
loudspeakers
impedance should be no less then 4Ω. Please
note that prolonged outputs overdriven can
be reason of main fuse blowing.
Parallel mode: This mode allow both channels
to operate in parallel with same signal. In this
mode the inputs for both channels are
internally connected, so only input1 require
audio signal but both volume controls are
active. Do not use parallel mode then feeding
the amplifier with two separate signals. Please
note that only amplifier inputs are connected
in parallel. Do not connect positive and
negative output connectors in parallel! This is
not a output parallel mode.
6. OUTPUT CONNECTORS
4 pole Speakon and blinding
connectors.
post
7. MAIN FUSE
For continued protection against risk of fire,
replays only same type fuse. If fuse
continuously blowing, contact with qualified
service personnel.
8. MAIN POWER
Main power socket. ~220V 50Hz.
9. VENTILATION HOLES
The fan speed is varied automatically to
maintain the proper internal operating
temperature. Direction of cooling air flow:
from the rear to the front.
Connections examples
STEREO SYSTEM (stereo mode)
MONO SYSTEM (parallel mode)
MONO SYSTEM (Bridge mode)
Block diagram
Specifications
Power specifications
Rated output power (8 Ω) (Stereo mode)
Rated output power (4 Ω) (Stereo mode)
Rated output power (8 Ω) (Bridge mode)
Rated output power (4 Ω) (Bridge mode)
Input Sensitivity
Input Impedance
Frequency Response
Distortion THD+noise 1kHz in full power
Signal to Noise Ratio
Slew rate
Damping Factor (1 kHz @ 8 Ω)
General specifications
Amplifier Protection
Amplifiers class
Controls
Indicators
Connectors (each channel)
Power Requirements
Fuses
Dimensions (HxWXD)
Weight - Net
2A400
2A600
2x400W
2x600W
2x700W
2x1050W
1250W
1750W
1700W
2300W
0.775 V (0 dBu)/ 1.0 V (2.2dBu)/ 1.44 V (5.3 dBu)
10kΩ unbalanced
15 Hz - 25 kHz: ±1 dB
< 0.03%
< 0.035%
> 102dB
> 105dB
40V/uS
> 400 :1
Full short circuit, open circuit, thermal, soft start, DC
voltage.
AB
Front: AC switch, channel 1 & 2 volume knobs
Power-on, signal, clip, protect, bridge, parallel
Input: balanced Phoenix and XLR
Output: Speakon, blinding post.
~230V AC 50Hz
T8A/250V
T12A/250V
89x482x453mm
22.5 kg
25 kg
The specifications above are correct at the time of printing of this manual. For improvement purposes, all
specifications for this unit, including design and appearance, are subject to change without prior notice.
AMC is a registered trademark of AMC Baltic www.amcpro.eu
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