Gemini X-02, X-03, X-01 manual Introduction, Features, CONNECTION, Controls Indicators, Operation

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 BRIDGEmode.

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 ALLHAVE SIGNALLED (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)