Gemini XPM-3000 Manuel D'instructions page 5

Introduction
Congratulations on purchasing a Gemini XPM-3000 Power Amplifier.
This state of the art power amplifier includes the latest features and is
backed by a five year limited warranty. Prior to use, we suggest that you
carefully read all the instructions.
Features
• MOSFET output stage technology for the finest sound quality and
reliability
• 3 Channel Operation: 2 Satellite Channels (Channels A and B) and 1
Subwoofer Channel
• Full range operation mode for set up without subwoofer(s)
• 2-way Linkwitz-Riley crossover with switchable crossover frequency
for flexible set up of subwoofer and satellite channels
• Switchable low frequency boost on the subwoofer channel optimizes
subwoofer performance
• Stable operation of subwoofer channel down to a 2 Ohm load
• Post crossover line level outputs for chaining additional subwoofers
and satellite speakers
• High output power to drive professional loudspeakers without clipping
• Oversized toroidal transformer, filter and heatsinks for better low end,
transparency and stability
• Comprehensive protection circuitry (short, overheat, DC, subsonic
and RF filters, turn-on delay) with high current speaker protection
relays
• True clip LEDs for better control
• Signal ground lift switch eliminates hum from connection loops
• Flexible input configuration with active balanced inputs; additional
input connectors to chain amps
• Outputs: 5-way binding posts in 120V; Neutrik Speakon connectors in
230V
• 2 parallel 5-way binding posts on the subwoofer output (in 120V only)
allows for easy set up with dual subwoofers
• Efficient dual aluminum extrusion heatsink design for thermal stability
and reliability
• Front-to-Rear airflow with 2 speed dual fan control
• Turn-on In-rush current limiting circuitry
• Compact 2U well balanced enclosure
• Steel reinforced chassis construction for durability and longevity
Cautions
Read all operating instructions before using this equipment.
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 service technician.
Be sure to allow adequate front and rear ventilation to avoid possible
heat damage to your equipment.
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.
Be sure that AC power is OFF when changing modes of operation and
when changing the position of the ground lift switch.
DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. Operators of
electronic equipment should in no way be in contact with water.
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.
DO NOT USE ANY SPRAY CLEANER OR LUBRICANT ON ANY
CONTROLS OR SWITCHES.
Connections, Controls and Indicators
Rear Panel
Note: 120V and 230V units have different types of output
connectors on the rear panel.
Input Section:
There are two parallel input connectors (one female XLR and one
1/4" jack) per channel. Either can be used as an input or as a link to
chain amplifiers.
XLR Input Jacks (11, 14): electronically balanced inputs accept a
standard XLR male connector. Pin 1 = shield/ground, pin 2 = hot or
positive (+) and pin 3 = cold or negative (-).
1/4" Input Jacks (12, 13): 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/ground. The
balanced line uses a tip-ring-sleeve connection. Tip = hot or positive
(+), ring = cold or negative (-), and sleeve = shield/ground.
Signal Ground Lift Switch (15) is used to lift the balanced input
connectors' ground/shield from the amplifier's ground. When the
signal ground is lifted, the sound source disconnects from the
amplifier's ground preventing ground loops which can generate hum
and noise. See the Signal Ground Lift Switch Instructions for more
detail.
AC Power Section:
Fuse (7): replace fuse with those of proper type and rating.
AC Cord Outlet (6) is used to attach the power cord to the unit.
Signal Processing Section:
Disconnect the unit from the AC power source before making any
connections.
Crossover Switch (3): Use the crossover
switch to set the crossover frequency
between the subwoofer and the satellite
channels (Channels A and B) at 120 Hz or
180 Hz. Or you can set the crossover
switch to FULL RANGE if you do not wish
to use a subwoofer (the full range signal
will then go to the satellite channels).
Low Frequency Boost Switch (4): The LF Boost Switch can be used to
optimize the performance of the subwoofer. The LF boost effect uses
specialized filter circuitry, including a subsonic filter, to cut off
subsonic frequencies which keeps the subwoofer from wasting
available energy. The filter also provides an
optional +3 dB or +6 dB boost at 40 Hz which
is suitable for most subwoofers. The circuitry
optimizes the performance of the
subwoofer by focusing the signal's energy
to match the subwoofer's characteristics.
Set the switch to be FLAT, +3 dB or +6
dB based on your subwoofer and your
experience.
NOTE: The LF Boost settings only effect the subwoofer
channel and will not effect the satellite channels.
Line Outputs (1, 2, 5): the amplifier has quasi balanced post crossover
line outputs. The line outputs connectors are 1/4" TRS and can be
used to connect to additional amplifiers (optional).
Output Section:
Speaker Outputs:
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 it will impact the
quality of the sound (lack of bass and incorrect stereo image).
Speaker Outputs for 120V Unit (8, 9, 10): the speaker output
connectors are 5-way binding posts 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
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