Datasat RA2400 User manual

Operation Manual
TM-H628 V1.00 (9301H62800V1.00)
RA2400
Power Amplifier
RA7300
Power Amplifier

Operation Manual, RA2400 & RA7300 Power Amplifiers Page 2
Document # 9301H62800 Ver. 1.00
PLEASE READ FIRST
CAUTION : To reduce the risk of electrical shock, do not remove the cover (or back). No user serviceable
parts inside. Refer servicing to qualified service personnel.
WARNING : To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture.
The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the
presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient
magnitude to constitute a risk of electrical shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important operation maintenance (servicing) instructions in the literature.
PRECAUTIONS:
The RA2400/RA7300 amplifier is a wideband design with substantial power output capability. Certain
precautions must be taken to ensure proper operation.

Never expose the amplifier to moisture.

Never plug an input cable into the RA2400/RA7300 while the unit is turned on.

Never apply the “thumb test” (touching the “hot” lead of the input cable with your finger) to the tip of
the input cable or input jack of the RA2400/RA7300. RF rectification and/or hum will be created and
could cause damage to the loudspeakers. Datasat will not be responsible for damage to the
loudspeakers due to improper use of the equipment.

Under no circumstances should the output terminals of the RA2400/RA7300 be short-circuited.

Avoid restricting the airflow around the RA2400/RA7300. Good airflow is necessary to ensure proper
cooling and trouble-free operation.

Ensure that the rated power handling of the loudspeakers connected to the RA2400/RA7300 is
appropriate to use with the output power of the amplifier. The warranty on the RA2400/RA7300 does
not cover damage to loudspeakers.
WARNING TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE.

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SAFETY INSTRUCTIONS
Read all the safety and operating instructions before connecting or using the RA2400/RA7300.
All warnings on the unit and in this operating manual should be adhered to.
All operating and use instructions should be followed.
Do not place/use the unit near water; for example, near a bathtub, washbowl/sink, laundry
tub, decorative water features (waterfalls/fountains), in a wet basement or near a swimming
pool.
This unit is not intended for outdoor use.
This unit should be installed so that its location or position does not interfere with its proper
ventilation. For example, it should not be situated on a bed, sofa, rug or similar surface that
may block its ventilation openings. It should also not be placed in a built-in enclosure, such as
bookcase or cabinet, that may impede the flow of air through its ventilation openings.
The unit should be situated away from heat sources such as radiators, fireplaces, hot air ducts,
heat registers, stoves and/or other devices (including amplifiers) that produce heat.
The unit should be connected to a power-supply outlet only of the voltage and frequency
marked on its rear panel.
The AC power cord should be routed so that it is not likely to be walked on or pinched,
especially near the plug, convenience receptacles or where the cord exits from the unit.
Clean unit only as recommended in this instruction manual.
The unit’s AC power cord should be unplugged from the wall outlet when the unit is to be
unused for a long period of time.
Care should be taken so that objects do not fall, and liquids are not spilled, into the unit
through any openings.
The unit should be serviced by qualified service personnel when:
a. The power cord or plug has been damaged; or
b. Objects have fallen, or liquid has been spilled, into the unit; or
c. The unit has been exposed to rain or liquids of any kind; or
d. The unit does not appear to operate normally or exhibits a marked change in
performance; or
e. The device has been dropped or the enclosure damaged.
To prevent electric shock, do not use a ground lift plug/adapter. Also, do not use the polarized
plug with an extension cord, receptacle or other outlet unless all the blades can be fully
inserted to prevent blade exposure.

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TABLE OF CONTENTS
Page
2 ........................................................................................................................................Please Read First
3 ..................................................................................................................................... Safety Instructions
4 ....................................................................................................................................... Table of Contents
6 .............................................................................................................................................. Introduction
6 ................................................................................................................................................... Features
7 ................................................................................................................................................. Unpacking
7 ................................................................................................................................................. Placement
8 ........................................................................................................................................... Rack Mounting
8 ................................................................................................................................................Front Panel
9-10 .................................................................................................................................................Rear Panel
11 ................................................................................................................... Connecting the RA2400/RA7300
11 ...................................................................................................................................... Input Connections
11-12 .................................................................................................................................. Dip Switch Settings
13-14 ................................................................................................................................ Speaker Connections
13 ...............................................................................................................................Wire Recommendations
13 ....................................................................................................................... Polarity and Speaker Phasing
14 .................................................................................................................. Using Wire to Speaker Terminals
14 .........................................................................................................Using Spade Lugs to Speaker Terminals
15 ...................................................................................................... Using Banana Plugs to Speaker Terminals
15 .......................................................................................................................... Running Cable to Speakers
15-16........................................................................................................................... Using the Remote Trigger
15 ..................................................................................................................Remote Turn On/Off Connections
15 ........................................................................ When Using Products Equipped with a Low Voltage Trigger Jack
15 ..............................................................................................When Using External AC to DC Power Converter
16 ................................................................................................................................. AC Power Connection
16 .......................................................................................................................... RA2400/RA7300 Operation
16 ....................................................................................................................................... Manual Power On
16 ....................................................................................................................................... Manual Power Off
17 ............................................................................................................................... Automatic (Trigger) On
17 ........................................................................................................... AC Line Connector and Power Cord(s)
17 ................................................................................................................................... Main Circuit Breaker
18 .................................................................................................................................Care and Maintenance

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18 ................................................................................................................................................... Cleaning
18 ......................................................................................................................................... Troubleshooting
18 ..................................................................................................................................... Protection Circuitry
18 ........................................................................................................................ Datasat Service Information
19 ...............................................................................................................A Few Words About Hum and Noise
20-21 ......................................................................................... Potential Ground Loops in a Complex A/V System
22 .....................................................................................................................RA2400/RS7300 Specifications
22-23........................................................................................................................... Datasat Limited Warranty
23 .....................................................................................................................................................Returns
24 ................................................................................................................................... Contact Information
Thank you for choosing the Datasat RA2400 / RA7300 Amplifiers!

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Document # 9301H62800 Ver. 1.00
DATASAT RA2400 / RA7300 AMPLIFIERS
Introduction
Congratulations! Thank you for purchasing the Datasat RA2400/RA7300 Power Amplifier(s).
Designed, engineered and manufactured in the United States, it has been carefully designed to
deliver the best possible audiophile-grade performance as well as the most reliable operation.
The RA7300 is a seven channel amplifier and the RA2400 is a two channel amplifier. This manual
covers both models with the differences being the number of channels, specifications, design
and/or power output.
In order to receive the maximum enjoyment from your new amplifier, please take a few minutes to
read this manual. The important information will help to ensure that the RA2400/RA7300 is
properly configured for trouble-free operation with the rest of your system’s equipment.
If you have any questions about this product, its installation or operation, please contact:
Datasat USA technical support via e-mail at [e-mail] or call 1(888) 428-2268.
Customers located in Europe may email [email protected] and/or call [phone].
Features
Your new RA2400/RA7300 amplifier is a state of the art, high performance audio component. Its
circuit topology is fully-differential and balanced from input to output. Both model amplifiers utilize
current feedback for improved speed and a DC servo to minimize any DC offset. Custom-designed
torrodial transformers with multiple secondary windings drive the high current power supplies
effectively making each channel a complete monoblock amplifier. To ensure signal purity, each
amplifier module employs advanced optically coupled protection circuitry that is outside the signal
path. Designed specifically for the rigors of rack-mounting, both model amplifiers use a
temperature controlled, fan-cooled heat tunnel with dual thermal sensors to draw cool air in from
the sides and exhaust warm air from the rear. The fan is calibrated to be silent during low-power
operation and any fan noise will be masked by program content during high-power output.
Unpacking
The carton and packing materials used in shipping your RA2400/RA7300 amplifier are specially
designed to protect it from the shocks and vibration of shipping. We strongly suggest that you save
the carton and packing materials to re-use if you move or if the unit needs to be shipped for any
reason. Should you discover that your RA2400/RA7300 has been damaged during shipping, please
contact your dealer or Datasat immediately and request the name of the carrier so a written claim
may be made.

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Datasat customer service can be reached by email at [email protected]
IMPORTANT! THE RIGHT TO A CLAIM AGAINST A PUBLIC CARRIER CAN BE FORFEITED IF THE
CARRIER IS NOT NOTIFIED PROMPTLY IN WRITING AND IF THE SHIPPING CARTON AND PACKING
MATERIALS ARE NOT AVAILABLE FOR INSPECTION BY THE CARRIER. SAVE ALL PACKING
MATERIALS UNTIL THE CLAIM IS SETTLED.
Placement
It is normal for the RA2400/RA7300 amplifier to become warm during standard home operation.
Note that during high-level playback into low impedance speaker loads, when the amplifier must
naturally dissipate more heat, the heat sinks inside the unit will become much warmer and the
speed of the internal cooling fan will increase (to dissipate the heat). To ensure proper cooling and
maintain trouble-free operation, it is imperative to provide the amplifier with adequate ventilation.
The RA2400/RA7300 should never be placed in a cabinet with other heat-producing components or
in an enclosure lacking free airflow. The amplifier should also be kept away from external sources
of heat such as radiators and/or hot-air ducts.
Rack Mounting
Your RA2400/RA7300 may be mounted in a standard 19-inch rack. Note that the rack mount
panels have both front and back mounting holes. The RA2400/RA7300 is heavy so support from the
back is required. Also, ensure that the screws used to attach the amplifier are appropriate for the
rack and are adequately gauged to support the weight of the amplifier.
Note that the RA2400/RA7300 amplifiers shipped from the factory come with the rack mount side
panels pre-attached. If you choose to not rack mount your amplifier, simply remove the rack
mount side panels and install the standard side panels (included) in their place.
CAUTION: IF THE RACK MOUNT SYSTEM YOU ARE USING CANNOT SUPPORT THE WEIGHT OF
YOUR RA2400/RA7300(S), BE SURE TO MOUNT THE AMPLIFIER(S) ON A STRONG, WELL-
SUPPORTED TABLE OR SHELF.

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RA2400 / RA7300
FRONT PANEL
A Power Switch Plate
Turns the RA2400/RA7300 on. The front panel LED will illuminate blue when the amplifier is
powered on. Note that the rear panel main power switch must be in the ON position for the
front panel power switch to work.

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REAR PANEL
RA7300 Shown
A Audio Inputs
There are two types of audio input connections:
●XLR type input jacks can be used to connect to the outputs of a preamplifier, receiver with
preamp-out connectors or other sound source devices for the RA2400/RA7300.
●DB25 “balanced analog audio in 1-8” connector is used to connect the Datasat RS20i (home
cinema audio processor) output to the RA2400/RA7300. A DB25 cable is included with the
RA2400/RA7300.
B DB25 “Balanced Analog Audio In 1-8” Connector Selector Switches
The selector switches are used for channel assignment when the DB25 “balanced analog audio in
1-8” input connector and cable are used with the RS20i. For easy reference, use the white
rectangles next to the switches to write in channel labels.
Note: The selector switches can be used to bypass the Subwoofer channel (input from DB25
“balanced analog audio in 1-8”) from the RA2400/RA7300. Since the selector switches do not
affect the DB25 “analog audio pass thru 1-8” connector, the Subwoofer signal (fed to the input
connector) can be connected to a separate self-powered subwoofer amplifier. The selector
switches can also be used route input signals when multiple RA2400/RA7300 amplifiers are

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used.
C Remote Trigger Input
The remote trigger input is used for remote activation of the RA2400/RA7300 by an external
device. The trigger is used to connect in a separate device in the system so when it powers on
it also powers on the RA2400/RA7300.
Use the Remote Trigger jack to connect a compatible preamp, source device or other product
(with a 3.3-24VDC output) that that you wish to use to remotely power on the RA2400/RA7300.
D Speaker Outputs
Use the Speaker Output binding posts to connect the RA2400/RA7300 to your speakers. The
binding posts are color coded to help ensure proper polarity.
E Product Serial Number
Document this number for future reference or when contacting Datasat customer
service/techsupport. You will be required to provide the serial number when reporting issues
and/or to verify warranty.
F AC Input
Use the included power cord(s) to connect your amplifier to an AC power source. The RA2400
uses one power cord and the RA7300 uses two.
G Master Power Switch
The rear panel Master Power switch(es) selects power to the amplifier, either on and off. The
switch(es) must be in the ON position for the front panel power switch and remote trigger to
work. Note the RA2400 has one master power switch and the RA7300 has two (both should
either be on or off).
H DB25 Analog Audio Pass-Thru 1-8 Connector
This connector routes signals from the DB25 input jack, through the RA2400/RA7300 for
connection to additional amplifiers. For example, the Subwoofer input channel can be switched
away from the RA2400/RA7300 and still be routed to the pass-thru connector. This allows the
Subwoofer signal to be fed to a separate amplifier. Also, the 8-channel analog audio output
from the Datasat RS20i can be routed to multiple RA2400/RA7300 amplifiers.
I Power Supply Voltage Indicator
Each RA2400/RA7300 is marked at the factory by a green dot to indicate the power
requirements. Be certain to use only the appropriate voltage as marked. Plugging an 117V

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amplifier into a 230V supply will damage the amplifier.
J Ground Terminal
Occasionally, audible hum arises when a preamplifier is connected to the RA2400/RA7300.
Should this occur, running a ground wire between the preamplifier and the RA2400/RA7300
may restore noise-free operation.
CONNECTING THE RA2400/RA7300
When making connections between any source component and the RA2400/RA7300, or when
making connections to any speaker, be certain that both the input devices and the RA2400/RA7300
are turned OFF. This will ensure that no unwanted signals/transients will be produced and possibly
damage equipment or speakers. It is always best to power off all equipment before making any
connections.
Input Connections
Connecting the RA2400/RA7300 to your source equipment is simple. Using high-quality audio
interconnect cables, match the output channel designations on the rear of your source equipment
to the input jacks on the rear panel of the RA2400/RA7300 that have the same channel name.
●When making connections with the XLR connectors, DB25 connector or any interconnect cables,
make certain to gently but firmly insert the plugs into the jacks.
●Make sure the connections are firmly seated and locked in. Loose connections may cause
intermittent sound and could damage your speakers.
●Note that some quality plugs may be very tight and it is important to ensure a proper, secure
connection between the interconnection cable and the input jack.
●Be careful to match the type of input you have decided to utilize on your RA2400/RA7300 with
the same type on your preamp or other source device.
Dip Switch Settings
When using the DB25 connectors, be sure that the dip switches on the RA2400/RA7300 have been
properly set for the desired channel being used:
●They should all be in the off position if you are using the XLR inputs.
●There will be no output if the switches are in the wrong position.
●The dip switches are used to assign the DB25 input connector (balanced analog audio Ch1-8) to
the RA2400/RA7300. Note that it does not affect the pass-thru connector (located directly below
the input connector). See the next page for an example of dip switch settings.

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Dip Switch Example: In a typical 7.1 set up using a separate self-powered sub you would assign
the dip switches as follows:
In the example, the settings allow Input 4, channel four (the subwoofer channel from the RS20i),
to bypass the “Balanced Analog Audio In 1-8” DB25 connector so that the subwoofer signal can
connect to an external subwoofer amplifier via the “Analog Audio pass-thru 1-8” DB25 connector.
Note that the pass-thru connector outputs are not affected by the dip switch settings; in other
words, the DB25 channel inputs are passed directly to the pass-thru DB25 connector below.
PLEASE CONSULT WITH DATASAT OR YOUR INSTALLER/DEALER IF THERE IS ANY
DOUBT.
DB25 Audio In select switches:
DB25 Input 1 ON = RA Channel A
DB25 Input 2 ON = RA Channel B
DB25 Input 3 ON = RA Channel C
DB25 Input 4 OFF
DB25 Input 5 ON = RA Channel D
DB25 Input 6 ON = RA Channel E
DB25 Input 7 ON = RA Channel F
DB25 Input 8 ON = RA Channel G
Notes:
RA = RA2400/RA7300
Input 4 = subwoofer channel from RS20i
“Input” on RA = “channel” output on RS20i
From RS20i
RA2400

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SPEAKER CONNECTIONS
To ensure the high quality signals produced by your RA2400/RA7300 are carried to your speakers
without loss of clarity or resolution, we recommend that you use high quality speaker wire. Many
brands of wire are available; the choice may be influenced by the distance between your speakers
and the RA2400/RA7300, the type of speakers you use, personal preferences or other factors.
Wire Recommendations
Regardless of the brand or type of speaker wire selected, we recommend that you use a wire
constructed of fine, multi-strand copper with a gauge (AWG) of 14 or less. In specifying wire, the
lower the number, the thicker the cable is. Wire with a gauge of 14 may be used for short runs of
less than twenty feet. We do not recommend that you use any wires with an AWG equivalent of 16
or higher due to the power loss and degradation in performance that will occur.
A pair of binding posts is provided to connect each RA2400/RA7300 output channel to your
speakers. These posts will accept bare wire, spade lugs or banana type plugs.
If bare wire is used for the connections, strip approximately 1/2 inch to 3/4 inch of insulation from
the end of each wire and carefully twist the strands of each conductor together. Be careful not to
cut the individual strands or twist them off. All strands must be used for optimal performance.
Polarity and Speaker Phasing
Correct polarity connections are important to ensure proper speaker phasing. When speaker
phasing is correct, the speaker cones will move in and out at the same time which preserves the
imaging (sound) of the program material. Out-of-phase connections mean that some speaker cones
will move in while others move out which can cause indistinct or confused imaging and muddled or
cloudy sounds.
To avoid incorrect phasing or polarity, be certain to use wire that has distinct markings, colors,
stripes, wording, or grooves on each side of the speaker cable so you can keep polarity straight.
When making connections to the RA2400/RA7300 and speakers you should adhere to a consistent
pattern being sure to connect the correct set of wires from the RA2400/RA7300’s output channel to
the desired speaker. Be sure to keep polarity straight.
Example: From the RA2400/RA7300
▪Connect red wire for channel 1 positive to the red (+) terminal on speaker channel 1
▪Connect black wire for channel 1 negative to the black (-) terminal on speaker channel 1
When using cable with markings on one side only, traditional convention is to consider the marked
side of the wire as the red or positive (+) connection and the non-marked side as the black or
negative (-) connection.

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Using Wire to Speaker Terminals
Loosen the knobs of the RA2400/RA7300 speaker terminals far enough so that the pass through
hole inside the terminal is revealed. If using bare wire, pass the wire through the hole. Following
the proper connection instructions for your system with regard to which terminals are used, twist
the cap back to the terminal so that the connection is secured. The bare wire should make contact
with the terminal metal. Be careful not to over tighten or use tools as this may break the delicate
wire strands which will decrease your sound system’s performance.
Using Spade Lugs to Speaker Terminals
The RA2400/RA7300 speaker terminals will also accept 9mm spade lugs. When using spade lugs,
connect them to the speaker wire using the manufacturer’s instructions. To connect, loosen the
caps on the RA2400/RA7300/speaker terminals and place lugs between the slot of the plastic cap
and the back of the terminal. Be sure to observe proper polarity, using the appropriate speaker
hook-up icons for your system’s configuration. Using your fingers, tighten the cap to obtain
positive contact of the lug to the connector metal.
Using Banana Plugs to Speaker Terminals
When using banana plugs, connections may be made by simply inserting the jack affixed to your
speaker wire into the hole provided on the rear of the colored screw caps on the binding posts.
Before using banana type jacks make certain that the plastic screw caps are firmly tightened down
by turning them in a clockwise direction until they are snug against the chassis. This will ensure
that the maximum metal surface area of the plug is in contact with the metal of the jack. Be certain
to observe proper polarity.
Running Cable to the Speakers
Neatly run the cables to the speaker locations. Do not coil any excess cable, as this may become an
inductor that can create frequency response variations in your sound system.
Connect wires to the speakers, again being certain to observe proper polarity: Negative/black wire
to the negative speaker terminal and positive/red wire to the positive speaker terminal.
NOTE: While most speaker manufacturers adhere to an industry convention of using red terminals for
positive connections and black terminals for negative, some manufacturers may vary from this
configuration. To assure proper phase connections and optimal performance, consult the identification
plate on your speaker terminals or the speaker’s manual to verify polarity. If you do not know the
polarity of your speaker, consult the speaker’s manufacturer for further information.

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USING THE REMOTE TRIGGER
Remote Turn On/Off Control Connections
The RA2400/RA7300 features a built-in remote trigger that can be setup to automatically activate
the amplifier when another device in the sound system is switched on.
When Using Products Equipped With a Low Voltage Trigger Jack
Switch the RA2400/RA7300’s rear panel power switch so that it is in the ON position. Then, using
an accessory cable with a 3.5mm mono mini-plug on each end, connect the trigger-output jack on
the rear of the source device to the trigger input jack on the back panel of the RA2400/RA7300.
When these connections are made, the RA2400/RA7300 should automatically turn on/off whenever
the triggering device is turned on/off.
When Using External AC to DC Power Converter
If your source device does not have a dedicated trigger jack, it is still possible to activate the
RA2400/RA7300 for automatic turn on/off. If a switched outlet is available on an external device, it
can be used to activate the RA2400/RA7300.
●To control the RA2400/RA7300 in this fashion you will need a small AC to DC power converter,
capable of delivering a 3.3 to 24 volt DC signal.
●The DC voltage should terminate to a standard 3.5mm type mini plug (tip + and shield -). This
type of converter may be obtained as a power adapter from many electronics retailers.
●When installing, press the main power switch on the back of the RA2400/RA7300 so that it is in
the ON position.
●Plug the AC adapter into the switched outlet of the source device that you wish to use to activate
the RA2400/RA7300. The source device could be the switched outlet at the rear of an AC receiver
or other audio equipment.
●Connect the 3.5mm mini-plug from the adapter to the trigger-input jack on the back panel of the
RA2400/RA7300. Once connected the RA2400/RA7300 should now turn on/off automatically,
based on the status of the controlling device.

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AC POWER CONNECTION
Once all audio and system connections have been made, connect the supplied power cord(s) to the
RA2400/RA7300 first and then connect it to an AC power source. Note that the RA7300 uses two
power cords whereas the RA2400 uses one.
IMPORTANT: Make certain that the amplifier is turned off and that any auto on/off
trigger device (if used) is off BEFORE connecting the amplifier’s power cord and plugging
it into an AC outlet. Also make sure all other equipment is powered off.
CAUTION: Do not plug the amplifier directly into the “Switched Accessory” outlet of another device!
These outlets are intended for use with low current draw products having a low current draw, such as
tuners, CD players or cassette decks. These cannot handle the high current draw of a power amplifier.
Using these outlets for a power amplifier is a significant safety hazard and if used in this way will void
warranty.
NOTE: It is not recommended that you connect other power amplifiers or products with a high current
draw, to the same AC power circuit as the amplifier. If this is unavoidable the Ultra-Soft-Start circuitry of
your amp will prevent excessively high in-rush current.
RA2400/RA7300 OPERATION
After all connections have been made you are ready for operation
First, one at a time, turn on the other components and processor in your sound system.
It is always a good idea to turn on the amplifier LAST. This avoids the possibility of any power on
“pops” or transients from other equipment being amplified and sent to your speakers where they
may cause damage.
To avoid damage to speakers, always start with a low volume level on your controller or preamp.
Manual Power On
Press the RA2400/RA7300’s front panel power plate (switch is underneath the plate). After a short
pause the blue LEDs should illuminate, indicating power is on, and sound should be supplied to the
speakers. The pause is intentional and protects your speakers from damage as the
RA2400/RA7300 stabilizes. Note that the RA2400/RA7300 rear panel power switch(es) must be in
the on position for the front panel power switch to work.
Manual Power Off
To turn the RA2400/RA7300 off, press the front panel power plate. The blue LEDs should
extinguish and the amplifier should turn off.

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Automatic (Trigger) On
First, make certain that the connection from the RA2400/RA7300 to the controlling device is
correct.
Turn on the controlling device and verify that the RA2400/RA7300 is automatically activated after a
short pause. Remember, this pause is intentional and is used to protect your speakers from
damage while the amplifier stabilizes. You may also hear a slight relay click during start up and this
is also normal.
Next, verify your RA2400/RA7300 automatically turns off when the controlling device is powered
off. Once the controlling device is powered off, the RA2400/RA7300 should automatically turn off
after a few moments.
AC LINE CONNECTOR AND POWER CORD(s)
Your RA2400/RA7300 is supplied with an internationally approved (IEC) power line connector that
accepts the supplied detachable, high-current capacity power cord(s). The RA7300 has two power
cords and the RA2400 comes with one.
WARNING: UNDER NO CIRCUMSTANCES SHOULD THE ROUND
THIRD PRONG BE CUT, BENT OR IN ANY OTHER WAY DEFEATED AS
THIS MAY RESULT IN SEVERE SHOCK.
Main Circuit Breaker
Your RA2400/RA7300 is supplied with one or two heavy-duty magnetic circuit breaker(s).
●If power to your RA2400/RA7300 is interrupted, inspect the circuit breaker on the rear of the
unit.
●If the circuit breaker is in the off position you may reset it to the on position to restore AC power.
●If the circuit breaker immediately trips to the off position, unplug the RA2400/RA7300 from the
AC power source and contact the Datasat Technical Support, email [email protected] or (if
you are located in or close to Europe) [email protected].
WARNING: ALWAYS TURN OFF THE RA2400/RA7300 AND UNPLUG THE POWER CORD(S)
BEFORE MAKING ANY ELECTRICAL CONNECTIONS.

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CARE AND MAINTENANCE
Cleaning
If the RA2400/RA7300 becomes dirty, wipe it with a clean, soft, dry cloth. If necessary, first wipe
the surface with a soft cloth slightly dampened with mild soapy water followed by a fresh cloth
dampened with clean water. Wipe dry immediately with a dry cloth. NEVER use benzene, thinner,
alcohol or any other volatile cleaning agent. Do not use abrasive cleaners, as they will damage the
finish of the metal parts. Avoid spraying insecticide, waxes, polishing agents or any aerosol product
near the unit.
Troubleshooting
Your RA2400/RA7300 is designed for trouble free operation. If you follow the instructions in this
manual you should enjoy many years of high quality listening enjoyment. However, as with any
sophisticated electronic device, there may be occasional problems upon initial installation or during
the life of the unit. Below are some general guidelines to assist you in rectifying minor problems
that may be encountered. If these solutions do not relieve the issue or if the problem persists,
contact Datasat Technical Support for assistance: Email [email protected] or (if you are
located in or close to Europe) [email protected].
Protection Circuitry
Your RA2400/RA7300 uses an advanced optically coupled protection circuit that does not require
fuses and is completely isolated from the audio path. In the event that the RA2400/RA7300 senses
a shorted speaker wire the protection circuit will engage shutting down the output. The circuit will
be sampled about every 7 seconds (nominal) and the RA2400/RA7300 output will be cut off as long
as the short exists. The RA2400/RA7300 should begin to operate normally after the shorted
situation is repaired. If RA2400/RA7300 goes into protection mode:
●First, check all speaker wire connections, both at the speakers themselves and at the speaker
terminals on the back of the RA2400/RA7300.
●Make certain that none of the strands from any channel touch another channel and that none of
the strands from a "positive" terminal touch those from a "negative" terminal. Even a few stray
wire strands can cause the RA2400/RA7300 to go into the protection mode.
●After checking all speaker connections, turn the RA2400/RA7300 back on. If it continues to turn
off, check your speakers to verify that they are operating properly.
●If all other potential sources of trouble check out properly, contact Datasat Technical Support for
further assistance: Email (USA) [email protected] or (Europe) [email protected].

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DATASAT SERVICE INFORMATION
The RA2400/RA7300 do not contain any internal user serviceable parts. If you suspect a problem
that may require service assistance, contact Datasat Technical Support.
It is important that only an authorized service agent carry out any/all repairs. This will ensure
proper service and preserve the protection of your Limited Warranty. Keep the sales slip or receipt
in a safe place with this manual so that it will be available to verify the purchase date. It will also
be needed should you experience a problem covered by warranty. If you need to contact Datasat
Technical Support or Customer Service, be ready to provide your amplifier’s serial number, a
description of the problem and your contact information. Before returning the amplifier, be sure to
obtain a return authorization (RA) prior to shipping the unit.
USA Technical Support Email: [email protected] Tel: [phone]
Customer Service Email: customerse[email protected] Tel: [phone]
Europe Email: [email protected] Tel: [phone]
RA2400/RA7300 updates and technical information is available at
www.datasatdigital.com/docs/consumer/
A FEW WORDS ABOUT HUM AND NOISE
One of the main benefits of the Pure Balance®design is its ability to reject hum often referred to as
CMR or Common Mode Rejection. The Pure Balance circuitry is engaged when using the XLR and
DB25 connectors on the RA2400/RA7300, and on the preamp or other source device being used.
Audible hum or a discernable low frequency noise is one of the most common problems in
audio/video systems. This hum is usually caused by a problem known as “ground loops” and may
be present even when the volume is at a low level. A ground loop occurs when there is a difference
in ground voltages between two or more components that are electrically connected. This, in turn,
creates multiple current paths which cause low-level noise or hum.
The potential for ground loops increases with the growing sophistication and complexity of home
audio/video systems and the increased number of components used to create these systems.
Although it is natural to suspect that the components in your sound system are the cause of the
hum, it’s also possible that it may be caused by other conditions. In particular, cable TV
connections from outside the home have been found to be a major source of hum.
If you encounter a hum problem in your sound system, please try the suggestions below, in the

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Document # 9301H62800 Ver. 1.00
sequence provided. If proceeding from one step to the next does not eliminate the problem,
contact your installer.
Potential Ground Loops in a Complex A/V (audio visual)
System
Suggestion #1:
To determine if a cable TV connection is responsible for the hum, first turn all components off.
●Disconnect the cable TV feed to your sound system at the first place where it connects to the
components.
●Disconnect the cable TV wire where it is connected at the wall outlet.
●Turn your system back on and listen if the hum has disappeared. If removing the cable TV feed
has eliminated the hum, you will need to insert a Ground Loop Isolator before reconnecting the
cable TV feed. If that does not help then contact your cable TV provider so they can better isolate
your cable feed.
Suggestion #2:
Turn off all components in your system.
●Disconnect the input cables at the amplifier.
●Turn the amplifier back on and see if the hum is still present.
●If the hum disappears the fault may be in the input cables being used. Try replacing them with
cables that have better shielding and make certain that the input cables are not running on top of
any AC power cords.
●Try disconnecting each cable one at a time to determine if one or all cables affect the noise.
●If the hum disappears when the input cables are disconnected but returns after the cables are
changed and the sound system re-connected, then the problem may be caused by one of your
source devices. To check this, disconnect each device one at a time to determine which is causing
the problem.
Suggestion #3:
Ground loop problems may also be caused by poor grounding of the electrical system in your
home, particularly when there are multiple components with three-prong, grounded power cords.
●Try unplugging these components one at a time and see if one or all of them is causing the
problem.