Gemini XPM-3000 Manuel D'instructions page 6

one connector touch the adjacent connector, the sound will be
distorted, and your amplifier will overheat and go into protection
mode.
NOTE (120V only): Two subwoofer output connectors are
provided to connect two subwoofers with separate cables.
These outputs are wired in parallel and are connected to a
mono subwoofer channel (subwoofer output is not
directional and does not require a stereo signal). The
combined load for the subwoofer channel must not be less
than 2 Ohms (a single 2 Ohm speaker OR two 4 Ohm
speakers OR four 8 Ohm speakers).
Speaker Outputs for 230V Unit (8, 9, 10): Neutrik Speakon connectors
are provided to connect speakers to the amplifier quickly and easily.
They are high current rated and provide very stable and durable
contacts. Every Speakon connector has pin 1- as negative and pin
1+ as positive.
WARNING: The XPM-3000 amplifier is designed to handle
low impedance loads and will operate normally with most
2 Ohm subwoofers or subwoofer combinations. The
amplifier will operate normally with most 4 Ohm speakers
on the satellite channels. However, for optimal
performance and reliability we recommend using
subwoofers and speakers with higher impedance (4 Ohms
for the subwoofer and 8 Ohms for the satellite channels).
NOTE: There are no bridge connections in this amplifier.
Please refer to the terminals' color coding for proper
connection polarity.
Front Panel
Power (23): the power switch turns the unit on and off.
Power LED (22): the power LED lights when the power is on. If the
power LED does not light, refer to the trouble shooting guide.
Signal LED (16): the signal LEDs for each channel show when a signal
is present.
Clip LED (17): the amplifier has true clip LEDs to help you properly
control the amplifier's output and achieve undistorted sound. The clip
LEDs for each channel light when your signal level is so strong that
the distortion reaches 1% THD. The clip LED should not remain
constantly on or flash repeatedly during operation. For clean sound
reproduction, the clip 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 system. 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 lights when no signal is present, it may indicate a RF signal on
the output which may cause damage to speakers (the RF signal will
not be audible).
Protect LED (18): when you first turn on the amplifier, the protect LEDs
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 LEDs will turn off. Otherwise, the
protect LED 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 occur, 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 Trouble
Shooting Guide. If the protect LED remains lit when resuming
amplifier operation, do not use the amplifier and contact an
authorized service technician.
Level Controls (19, 20, 21): establish the input levels required for each
channel.
Operating Instructions
THE AMPLIFIER'S POWER MUST BE TURNED OFF
WHEN CHANGING SETTINGS.
Using the Amplifier With Subwoofer(s) and Satellite
Speakers
The XPM-3000 has two channels for stereo operation and a common
subwoofer channel. The amplifier has a built in crossover to separate the
input signal between the stereo satellite channels and the mono
subwoofer channel (the low frequency signal feeding the subwoofer is
not directional and does not require stereo operation). The amplifier also
provides an optional low frequency boost for the subwoofer channel to
optimize the performance of your subwoofer.
1. With the power off, connect your input cables to the channel A and B
inputs using either the XLR INPUT JACKS (11, 14) or 1/4" INPUT
JACKS (12, 13) for each channel. The other channel A and channel
B inputs can be used to link to an additional amplifier.
2. Connect the subwoofer(s) to the subwoofer SPEAKER OUTPUT(S)
(10). Connect the full range loudspeakers to the channel A and
channel B SPEAKER OUTPUTS (8, 9). THE TOTAL SPEAKER
LOAD MUST BE AT LEAST 4 OHMS PER CHANNEL FOR THE
SATELLITE CHANNELS AND 2 OHMS FOR THE SUBWOOFER. If
you try to operate at a lower impedance, the amplifier will overheat
and then go into protection mode and stop operation until you correct
the load conditions.
3. If you choose to use additional amplifiers, connect the additional
amplifiers to the XPM-3000 using the LINE OUTPUT (1, 2, 5)
connectors.
NOTE: The line outputs tap the signal after the crossover
and the low frequency boost but before the level controls.
4. Use the CROSSOVER SWITCH (3) to set the crossover frequency
between the subwoofer and the satellite channels (Channels A and B)
at 120 Hz or 180 Hz.
5. Use the LOW FREQUENCY BOOST SWITCH (4) 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. 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.
6. With the LEVEL CONTROLS (19, 20, 21) of the channels set to zero
(fully counterclockwise), turn the POWER (23) on. Apply a signal to
the input of the amplifier. The level of the input signal should be as
high as you will ever need it to be. This way, it will be as high above
the amplifier's noise floor as possible, ensuring an excellent
performance and signal to noise ratio. Adjust the LEVEL CONTROLS
for each channel to achieve the desired maximum listening level.
Note, when the clip LEDs light, there is distortion present in the
amplifier's output section. If a clip LED 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.
Using the Amplifier Without Subwoofer(s)
The XPM-3000 gives you the option of operating the amplifier as you
would a conventional amplifier, without using subwoofer(s). This flexibility
is especially useful if you don't want to transport your subwoofers at
times.
1. With the power off, connect your input cables to the channel A and B
inputs using either the XLR INPUT JACKS (11, 14) or 1/4" INPUT
JACKS (12, 13) for each channel. The other channel A and channel
B inputs can be used to link to an additional amplifier.
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