CAUTION: THIS PRODUCT SATISFIES FCC REGULA TIONS WHEN SHIELDED CABLES AND
CONNECTORS ARE USED T O CONNECT THE UNIT TO OTHER EQUIPMENT. TO PREVENT
ELECTROMAGNETIC INTERFERENCE WITH ELECTRIC APPLIANCES SUCH AS RADIOS AND
TELEVISIONS, USE SHIELDED CABLES AND CONNECTORS FOR CONNECTIONS.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT
THE USER TO THE PRESENCE OF IMPORT ANT OPERA TING AND MAINTENANCE
(SERVICING) INSTRUCTIONS IN THE LITERATURE ACCOMP ANYING THE APPLIANCE.
THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL, WITHIN AN EQUILATERAL
TRIANGLE, IS INTENDED TO ALERT THE USER TO THE PRESENCE OF UNINSULA TED
“DANGEROUS VOL T AGE” WITHIN THE PRODUCT’S ENCLOSURE THA T MAY BE OF
SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK TO PERSONS.
READ INSTRUCTIONS: All the safety and operating instructions should be read
before the product is operated.
RETAIN INSTRUCTIONS: The safety and operating instructions should be retained for
future reference.
HEED WARNINGS: All warnings on the product and in the operating instructions
should be adhered to.
FOLLOW INSTRUCTIONS: All operating and use instructions should be followed.
CLEANING: The product should be cleaned only with a polishing cloth or a soft dry
cloth. Never clean with furniture wax, benzine, insecticides or other volatile liquids
since they may corrode the cabinet.
ATTACHMENTS: Do not use attachments not recommended by the product
manufacturer as they may cause hazards.
WATER AND MOISTURE: Do not use this product near water, for example, near a
bathtub, wash bowl, kitchen sink, or laundry tub; in a wet basement; or near a
swimming pool; and the like.
ACCESSORIES: Do not place this product on an unstable cart, stand, tripod, bracket,
or table. The product may fall, causing serious injury to a child or adult, and serious
damage to the product. Use only with a cart, stand, tripod, bracket, or table
recommended by the manufacturer, or sold with the product. Any mounting of the
product should follow the manufacturer’s instructions, and should use a mounting
accessory recommended by the manufacturer.
CART: A product and cart combination should be moved with care. Quick stops, excessive
force, and uneven surfaces may cause the product and cart combination to
overturn. See Figure A.
VENTILA TION: Slots and openings in the cabinet are provided for ventilation and to
ensure reliable operation of the product and to protect it from overheating, and
these openings must not be blocked or covered. The openings should never be
blocked by placing the product on a bed, sofa, rug, or other similar surface. This product
should not be placed in a built-in installation such as a bookcase or rack unless proper
ventilation is provided or the manufacturer’s instructions have been adhered to.
POWER SOURCES: This product should be operated only from the type of power
source indicated on the marking label. If you are not sure of the type of power
supply to your home, consult your product dealer or local power company.
LOCA TION: The appliance should be installed in a stable location.
NON-USE PERIODS: The power cord of the appliance should be unplugged from the
outlet when left unused for a long period of time.
GROUNDING OR POLARIZA TION:
• If this product is equipped with a polarized alternating current line plug (a plug
having one blade wider than the other), it will fit into the outlet only one way. This is
a safety feature. If you are unable to insert the plug fully into the outlet, try
reversing the plug. If the plug should still fail to fit, contact your electrician to
replace your obsolete outlet. Do not defeat the safety purpose of the polarized plug.
• If this product is equipped with a three-wire grounding type plug, a plug having a
third (grounding) pin, it will only fit into a grounding type power outlet. This is a
safety feature. If you are unable to insert the plug into the outlet, contact your
electrician to replace your obsolete outlet. Do not defeat the safety purpose of the
grounding type plug.
POWER-CORD PROTECTION: Power-supply cords should be routed so that they are
not likely to be walked on or pinched by items placed upon or against them, paying
particular attention to cords at plugs, convenience receptacles, and the point where
they exit from the product.
OUTDOOR ANTENNA GROUNDING: If an outside antenna or cable system is
connected to the product, be sure the antenna or cable system is grounded so as
to provide some protection against voltage surges and built-up static charges.
Article 810 of the National Electrical Code, ANSI/NFPA 70, provides information
with regard to proper grounding of the mast and supporting structure, grounding of
the lead-in wire to an antenna discharge unit, size of grounding conductors, location
of antenna-discharge unit, connection to grounding electrodes, and requirements for
the grounding electrode. See Figure B.
LIGHTNING: For added protection for this product during a lightning storm, or when it
is left unattended and unused for long periods of time, unplug it from the wall outlet
and disconnect the antenna or cable system. This will prevent damage to the
product due to lightning and power-line surges.
POWER LINES: An outside antenna system should not be located in the vicinity of
overhead power lines or other electric light or power circuits, or where it can fall into
such power lines or circuits. When installing an outside antenna system, extreme
care should be taken to keep from touching such power lines or circuits as contact
with them might be fatal.
OVERLOADING: Do not overload wall outlets, extension cords, or integral
convenience receptacles as this can result in a risk of fire or electric shock.
OBJECT AND LIQUID ENTRY: Never push objects of any kind into this product
through openings as they may touch dangerous voltage points or short-out parts
that could result in a fire or electric shock. Never spill liquid of any kind on the product.
SERVICING: Do not attempt to service this product yourself as opening or removing
covers may expose you to dangerous voltage or other hazards. Refer all servicing
to qualified service personnel.
DAMAGE REQUIRING SERVICE: Unplug this product from the wall outlet and refer
servicing to qualified service personnel under the following conditions:
• When the power-supply cord or plug is damaged.
• If liquid has been spilled, or objects have fallen into the product.
• If the product has been exposed to rain or water.
• If the product does not operate normally by following the operating instructions. Adjust
only those controls that are covered by the operating instructions as an improper
adjustment of other controls may result in damage and will often require extensive work
by a qualified technician to restore the product to its normal operation.
• If the product has been dropped or damaged in any way.
• When the product exhibits a distinct change in performance, this indicates a need for service.
REPLACEMENT PARTS: When replacement parts are required, be sure the service
technician has used replacement parts specified by the manufacturer or have the
same characteristics as the original part. Unauthorized substitutions may result in
fire, electric shock, or other hazards.
SAFETY CHECK: Upon completion of any service or repairs to this product, ask the
service technician to perform safety checks to determine that the product is in
proper operating condition.
WALL OR CEILING MOUNTING: The product should not be mounted to a wall or ceiling.
HEAT: The product should be situated away from heat sources such as radiators,
heat registers, stoves, or other products (including amplifiers) that produce heat.
(2)(2)
(2)
(2)(2)
X-0I, X-02, X-03:
FRONT FRONT
FRONT
FRONT FRONT
REAR REAR
REAR
REAR REAR
X-04:
FRONT FRONT
FRONT
FRONT FRONT
REAR REAR
REAR
REAR REAR
(3)(3)
(3)
(3)(3)
INTRODUCTION:
Congratulations on purchasing a Gemini Power Amplifier. This state
of-the-art power arnplifier includes the latest features and is backed by
a three year limited warranty. Prior to use, we suggest that you
carefully read all the instructions.
OUTPUT SECTION:
Disconnect unit from the AC power source before making any connections.
Pay close attention to polarity (shown on the back of the unit)
when connecting your speakers. Connecting your speaker systems
using the wrong polarity will not damage your speakers, but will impact
the quality of the sound (lack of bass and incorrect stereo image).
FEATURES:
• State-of-the-art bi-polar output stage technology for the finest sound quality and reliability
• High output power to drive professional loudspeakers without clipping
• Comprehensive protection circuitry (Short Circuit, DC, Thermal Cut-off, Sub/Ultrasonic
Frequency Filters, Turn-on Delay , Main Fuse, Secondary DC Fuses)
• Three modes of operation: stereo, parallel mono and mono bridge
• Ground lift switch for flexibility in installations
• Signal LED and Clip LED for better control on X-01, X-02, X-03 amplifers
• Large VU-meters and Clip LED for better control on X-04 amplifier
• Efficient dual aluminum extrusion heatsink design with directly mounted output transistors
for no-fault operation
• Efficient air guide with front-to-rear airflow for thermal stability and reliability
• Compact 2U well balanced enclosure (3U for X-04 model)
• Steel reinforced chassis construction for durability and longevity
• 1/4” as well as 3-way binding post speaker outputs
CAUTIONS:
1. Read all operating instructions before using this equipment.
2. To reduce the risk of electrical shock, do not open the unit. There are
NO USER REPLACEABLE P ARTS INSIDE. Please contact the Gemini
Service Department or your authorized dealer to speak to a qualified
Gemini Sound Products technician.
3. Be sure to allow adequate front and rear ventilation to avoid possible
heat damage to your equipment.
4. Be sure that AC power is OFF and all level controls are set to MINIMUM
before making connections. This will eliminate any chance of unexpected,
loud audio transients that could damage your speaker systems.
5. Be sure that AC power is OFF when changing modes of operation
and when changing the position of the Ground Lift Switch.
6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. Operators of
electronic equipment should in no way be in contact with water.
7. When connecting to AC power line be sure you haven’t lost the ground
connection by using an adapter or extension cord without a 3 prong plug.
8. DO NOT USE ANY SPRA Y CLEANER OR LUBRICANT ON ANY
CONTROLS OR SWITCHES.
CONNECTION, CONTROLS &
INDICATORS:
REAR P ANEL INPUT SECTION:
INPUT JACKS (1/4"/XLR): 1/4" (1, 2) input jacks accept a balanced as well as
an unbalanced line level signal. The unbalanced line uses a standard tip-sleeve
connection. The tip is positive and the sleeve is negative. The balanced line
uses a tip-ring-sleeve connection. The tip is hot or positive (+), the ring is
cold or negative (-), and the sleeve is shield or ground. The XLR (3, 4)
jacks are balanced inputs that accept standard MALEXLR cables.
Refer to the back panel for XLR (3,4) pin assignments.
OPERATION MODE SWITCH: OPERATION MODE SWITCH (5) switch is
used to set the unit for STEREO mode, PARALLEL MONO mode or MONO
BRIDGE mode.
AC POWER SECTION:
GROUND LIFT SWITCH: GROUND LIFT SWITCH (6) is used to lift the
balanced input connectors’ ground/shield from the amplifier’s ground.
When the signal ground lifted, the sound source disconnects from the
amplifier’s ground preventing ground loops which can generate hum and
noise. See the GROUND LIFT SWITCH INSTRUCTIONS for more detail.
AC LINE VOLTAGE SWITCH: AC LINE VOLTAGE SWITCH (7) allows
reconfiguring amplifier for either 110-120V or 220-240V AC lines.
FUSE: Replace FUSE (8) with those of proper type and rating.
AC INLET: AC INLET (9) is used to attach the power cord to the unit.
SPEAKER OUTPUTS (3-WAY-1/4”): The SPEAKER OUTPUTS
connectors are 3-WAY BINDING POSTS (10, 11, 12) that will accept
standard banana plugs, spade lugs, or bare wire;
connections are clean when using bare wire connections. If any
strands of wire from one connector touch the adjacent connector, the
sound will distort, and your amplifier will overheat and go into protection
mode. The 1/4” (13,14) outputs provide additional outputs.
NOTE: TOTAL SPEAKER IMPEDANCE MUST NOT BE LOWER THAN 4 OHM PER CHANNEL FOR
STEREO AND PARALLEL MONO MODES, AND 8 OHM FOR MONO BRIDGE MODE.
Make sure that all the
FRONT PANEL:
ON/OFF: The ON/OFF (15) switch turns the unit on and off.
POWER LED: The POWER LED (16) lights when the power is on. If the
POWER LED (16) does not light, refer to the troubleshooting guide.PROTECT LED: When you first turn on the amplifier, the PROTECT
LEDS (17) light briefly during a turn-on delay which indicates that the
outputs are disconnected internally. There will be an audible click when
the outputs reconnect and the PROTECT LED (17) will turn off.
Otherwise, the PROTECT LED (17) indicates that there is a problem
either in the amplifier’s external connections, load or temperature
conditions or its internal functions. If one of these situations occurs, the
amplifier senses the problem and automatically switches into protection
mode. The LED will light to warn you of the trouble and the amplifier will
stop working. If this occurs, switch off the amplifier and refer to the
TROUBLESHOOTING GUIDE. If the PROTECT LED (17) remains lit when
resuming amplifier operation, do not use the amplifier and contact a
GEMINI customer service representative.
SIGNAL LED: The SIGNAL LED (18a ) for each channel show when a
signal is present. In MONO BRIDGE mode, both the CHANNEL 1 LED and
the CHANNEL 2 LED will light in unison.
NOTE: X-01, X-02, & X-03 ALL HAVE SIGNAL LED (18a) EXCEPT FOR THE X-04 WHICH HAS VU METERS
VU METERS: Large illuminated VU METERS (18b) display the input level
of each channel.
CLIP LED: The amplifier has true CLIP LED (19) to help you properly
control the amplifier’s output and achieve undistorted sound. The CLIPLED (18) for each channel light when your signal level is so strong that the
distortion reaches 1% THD. The CLIP LED (19) should not remain
constantly on or flash repeatedly during operation. For clean sound
reproduction, the CLIP LED (19) should only light occasionally for an
instant. If the LED remains on or flashes repeatedly, you will hear distorted
sound that can be damaging to your speaker systems. If this occurs,
reduce the signal level by lowering the input level control for the channel
that is clipping or reduce the level at the source. If the CLIP LED (19)
lights when no signal is present, it may indicate an DCsignal on the output
which may cause damage to speakers (the DC signal will not be
audible). Please note that when you are using the amplifier in the MONO
BRIDGE mode, both CLIP LED (19) of the bridged channels will operate
required for each channel. Only the CHANNEL 1 LEVEL CONTROL (20)
works in MONO BRIDGE mode.
OPERATION:
STEREO OPERATION:
THE AMPLIFIER’S POWER MUST BE TURNED OFF WHEN CHANGING
MODES OF OPERATION.
The unit has two channels for stereo operation. Each channel provides
a separate and discrete signal at the speaker outputs according to the
signal received at the inputs. The following instructions are for
applications with 4 Ohm or 8 Ohm speakers of matched power ratings.
1. With the power off, set the OPERATION MODE SWITCH (5) to the STEREO
position.
(4)(4)
(4)
(4)(4)
2. With the power off, connect your input cables to the CHANNEL 1 and 2
inputs using the 1/4" (1, 2,) or XLR (3, 4) INPUT JACKS of each channel.
3. Connect the loudspeakers to the CHANNEL 1 and CHANNEL 2
SPEAKER OUTPUTS (10, 12, or 13, 14). THE TOTAL SPEAKER LOAD
MUST BE AT LEAST 4 OHMS PER CHANNEL. If you try to operate at a
lower impedance, the amplifier will go into protection mode and stop
operation until you correct the load conditions.
4. With the CHANNEL 1 LEVEL CONTROL (20)set to zero (fully
counterclockwise), turn the POWER SWITCH (15) ON. With the level
controls of your MIXER or other INPUT device turned all the way DOWN,
turn the amplifier level control all the way up for desired loudness from
your speakers. Note, when the CLIP LED (19) light, there is distortion
present in the amplifier’s output section. If a CLIP LED (19) remains on or
flashes repeatedly, reduce the signal level by lowering the input level
control for the channel that is clipping or reduce the level at the source.
With the LEVEL CONTROLS (20. 21) of both channels set to zero (fully
4.
counterclockwise), turn the POWER SWITCH (15) ON. With the level
controls of your MIXER or other INPUT device turned all the way DOWN,
turn the amplifier level controls all the way up for desired loudness from
your speakers.
present in the amplifier’s output section. If a CLIP LED (19) remains on or
flashes repeatedly, reduce the signal level by lowering the input level
control for the channel that is clipping or reduce the level at the source.
5. Now adjust your MIXER or other INPUT source to your desired listening
level. You also have the choice of keeping the volume of both speakers
equal, or for certain situations you can adjust the volume so one side
will be louder than the other.
Note, when the CLIP LED (19) light, there is distortion
PARALLEL MONO OPERATION:
Follow these instructions for PARALLEL MONO operation using a
single input cable, and you will have the same monophonic signal on
both the CHANNEL 1 and the CHANNEL 2 outputs. Each channel’s
output is controlled independently by that channel’s level control.
1. With the power OFF, set the OPERATION MODE SWITCH (5) to thePARALLEL MONO position.
2. With the power OFF, connect your input cables to the CHANNEL 1 input
only using the INPUT JACK, 1/4" (1) or XLR (3) of CHANNEL 1.
3. Connect the loudspeakers to the CHANNEL 1 and CHANNEL 2
SPEAKER OUTPUTS (10, 12). THE TOT AL SPEAKER LOAD MUST BE
AT LEAST 4 OHMS PER CHANNEL. If you try to operate at less than 4
Ohms per channel, the amplifier will go into the protection mode and stop
operation until you correct the load conditions.
4. With the LEVEL CONTROLS (20. 21) of both channels set to zero (fully
counterclockwise), turn the POWER SWITCH (15) ON. With the level
controls of your MIXER or other INPUT device turned all the way DOWN,
turn the amplifier level controls all the way up for desired loudness from
your speakers. Note, when the CLIP LED (19) light, there is distortion
present in the amplifier’s output section. If a CLIP LED (19) remains on or
flashes repeatedly, reduce the signal level by lowering the input level
control for the channel that is clipping or reduce the level at the source.
5. Now adjust your MIXER or other INPUT source to your desired listening
level. You also have the choice of keeping the volume of both speakers
equal, or for certain situations you can adjust the volume so one side
will be louder than the other.
MONO BRIDGE OPERA TION:
Follow these instructions to bridge the unit’s output. Bridging the
amplifier converts the unit to a monophonic or single channel amplifier.
The amplifier can be used with 8 Ohm or higher loads only in MONOBRIDGE mode. This mode is used to provide a higher voltage with
greater headroom to your speaker. Before setting your amplifier for
MONO BRIDGE operation, make sure that your speaker can handle the
high power level provided by the amplifier in MONO BRIDGE mode.
CAUTION: VOL TAGE OVER 100 VOL TS MAY BE PRODUCED A T THE BRIDGE OUTPUT
TERMINALS IN THIS MODE.
1. With the power off, set the OPERATION MODE SWITCH (5) to the
BRIDGE position.
2. With the power off, connect your input cables to CHANNEL 1 input only
using the INPUT JACK, 1/4" (1) or XLR (3) of CHANNEL 1.
3. Connect the loudspeaker to the BRIDGE SPEAKER OUTPUT (11) only.
Be sure the polarity of your connection is correct. The total speaker load
must be at least 8 Ohms or above. If you try to operate at less than 8Ohms in the MONO BRIDGE mode, the amplifier will go into the
protection mode and stop operation until you correct the load conditions.
5. Now adjust your MIXER or other INPUT source to your desired listening
level. You also have the choice of keeping the volume of both speakers
equal, or for certain situations you can adjust the volume so one side
will be louder than the other.
USING THE GROUND LIFT SWITCH:
Depending on your system configuration, sometimes applying the
ground will create a quieter signal path. Sometimes lifting the ground
can eliminate ground loops and hum to create a quieter signal path.
1. With the power amp on, listen to the system in idle mode (no signal present)
with the ground applied (the GROUND LIFT SWITCH (6) in the left position).
2. Turn the power off before moving the GROUND LIFT SWITCH (6). Lift the
ground by moving the GROUND LIFT SWITCH(6) to the right, turn the power
back on and listen to determine which position will provide a signal free of
background noise and hum. Keep the GROUND LIFT SWITCH(6) in the
ground position if the noise level remains the same in either position.
CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER AMPLIFIER IN ANY WA Y.
TERMINATION OF THE AC GROUND CAN BE HAZARDOUS.
SPECIFICATIONS:
Output Power EIA:.................................................1kHz @ 1% THD, Wrms
Both Channels Driven 8Ω 85140200200
Both Channels Driven 4Ω 110200300300
Mono Bridge 8Ω220400600600
Dynamic Headroom, dB:
At8Ω1.41.51.61.6
At4Ω1.92.02.22.2
Frequency Response..........................................................30 Hz - 50 kHz
Total Harmonic Distortion.............Iess than 0.05%, typical 0.02% @ 1 kHz
Signal to Noise ratio.............................100 dB below rated power @ 8Ω
Damping factor.......................................................greater than 200 @ 8Ω