Gemini X-01 Manuel D'instructions page 4

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.
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" TRS & XLR balanced/unbalanced input connectors
• 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 PARTS 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 SPRAY CLEANER OR LUBRICANT ON ANY
CONTROLS OR SWITCHES.
CONNECTION, CONTROLS &
INDICATORS:
REAR PANEL 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 MALE XLR 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.
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).
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; Make sure that all the
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.
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 CLIP
LED (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
simultaneously.
LEVEL CONTROLS: LEVEL CONTROLS (20, 21) establish the input levels
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)