Gemini XPB-750 User Manual

OPERA TIONS MANUAL

Bedienungsanleltung Manual de funcionamiento Manual de fonctionnement Manual del utente

XPB-750 XPB-1600

STEREO POWER AMPLIFIER

Stereo Endverstärker Amplificador de Potencia Estereo Amplificateur de Puissance Stéréo

Amplificatore di Potenza Stereofonico

Multi Language Instructions

English............................................................................Page 3

Deutsch...........................................................................Page 7

Español...........................................................................Page 11

Francais...........................................................................Page 15

Italiano............................................................................Page 19

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2 3 4

1 2 3 4

1312

Page 2

Stereo Stereo-Betrieb Estéreo Stéréo Stereo

Parallel Mono Parallel Mono-Betrieb Mono en Paralelo Mono en Parallèle Mono in Parallelo

Mono Bridge Mono Brücken-Betrieb Mono en Puente Mono Ponté Mono a Ponte

Page 3

Introduction

Congratulations on purchasing a Gemini XPB Power Amplifier. This state of the art power amplifier 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 technology provides exceptional reliability when

working with difficult speakers with up to 2 ohm impedence

• Excellent handling of low frequencies as well as clear mids and

flawless highs

• 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

• Three modes of operation - stereo, parallel mono and mono bridge

with mode status indication LEDs on front panel

• Flexible input configuration with active balanced inputs; additional

input connectors to chain amps

• True clip LEDs for better control

• Front-to-Rear airflow with 2 speed dual fan control

• Efficient dual aluminum extrusion heatsink design for thermal stability

and reliability

• 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 PAR TS 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 (1, 5): 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" Phone Input Jacks (2, 4): 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.

Operation Mode Switch (3): switch is used to set the unit for Stereo

mode, Parallel Mono mode or Mono Bridge mode.

AC Power Section:

Fuse (7): replace fuse with those of proper type and rating. Signal Ground Lift Switch (8) 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 Signal Ground Lift Switch Instructions for more detail.

AC Cord Outlet (6) (Note: 230V units only) is used to attach the power

cord to the unit.

Output Section:

Disconnect the 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 it will impact the quality of the sound (lack of bass and incorrect stereo image).

Speaker Outputs for 120V Unit (9, 10, 11): the speaker output jacks

are 5-way binding posts that will accept a 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 be

distorted, and your amplifier will overheat and go into protection

mode. Speaker Outputs for 230V Unit (9, 10, 11): 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. A third Speakon connector in the center is

provided to be used if the amplifier is in the Mono Bridge mode. Every

Speakon connector has pin 1- as negative and pin 1+ as positive.

NOTE: Total speaker impedance must not be lower than 2 Ohm per channel for Stereo and Parallel Mono modes, or 4 Ohm for Mono Bridge mode.

The XPB amplifier is designed to handle low impedence loads and will operate normally with most 2 ohm speakers/ parallel speaker combinations. However, for optimal performance and reliability we recommend using speakers with higher impedence.

Front Panel

Power Switch (20): turns the unit on and off. Power LED (19): the power LED lights when the power is on. If the

power LED does not light, refer to the trouble shooting guide. Mono LED (12): the mono LED will light when you have set the rear

panel Operation Mode Switch (3) for parallel mono operation.

Always make sure that this switch is in the correct position and that

all speaker connections have been made correctly for the mode of

operation you wish to use before powering up the amplifier. Bridge LED (13): the bridge LED will light when you have set the rear

panel Operation Mode Switch (3) for mono bridge operation.

Always make sure that this switch is in the correct position and that

all speaker connections have been made correctly for the mode of

operation you wish to use before powering up the amplifier. Signal LED (14): the signal LEDs for each channel show when a signal

is present. In Mono Bridge mode, both the channel A LED and the

channel B LED will light in unison.

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Clip LED (15): 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 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 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). Please note that when you are using the amplifier in the Mono Bridge mode, both clip LEDs of the bridged channels will operate simultaneously.

Protect LED (16): 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 (17, 18): establish the input levels required for each

channel. Only the Channel A Level Control (17) works in Mono Bridge mode.

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 A and the channel B outputs. Each channel’s output is controlled independently by that channel’s level control.

1. With the power off, set the OPERATION MODE SWITCH (3) to the

PARALLEL MONO position. When the power is on, the MONO LED

(12) on the front panel will light. If the LED does not illuminate, you

have the switch in the wrong position. Correct before continuing.

2. With the power off, connect your input cables to the channel A input

only using the either the XLR INPUT JACK (5) or 1/4" INPUT JACK

(4) of channel A. The other channel A input can be used to link to an

additional amplifier.

3. Connect the loudspeakers to the channel A and channel B SPEAKER

OUTPUTS (9, 11). THE TOTAL SPEAKER LOAD MUST BE A T LEAST

2 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 LEVEL CONTROLS (17, 18) set to zero (fully

counterclockwise), switch the power on. Apply a signal to the input.

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.

Operating Instructions

THE AMPLIFIER’S POWER MUST BE TURNED OFF WHEN CHANGING MODES OF OPERATION.

Stereo 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 8 Ohm, 4 Ohm or 2 Ohm speakers of matched power ratings.

1. With the power off, set the OPERATION MODE SWITCH (3) to the

STEREO position. When the power is on, the Mono and Bridge LEDs

on the front panel will not light. If these LEDs illuminate, you have the

switch in the wrong position. Correct before continuing.

2. With the power off, connect your input cables to the channel A and

B inputs using either the XLR INPUT JACKS (1, 5) or 1/4" INPUT

JACKS (2, 4) of each channel. The other channel A and channel B

inputs can be used to link to an additional amplifier.

3. Connect the loudspeakers to the channel A and channel B SPEAKER

OUTPUTS (9, 11). THE TOTAL SPEAKER LOAD MUST BE A T LEAST

2 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 LEVEL CONTROLS (17, 18) of both channels set to zero

(fully counterclockwise), turn the POWER SWITCH (20) 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.

Mono Bridge Operation

Follow these instructions to bridge the unit’s outputs. Bridging the amplifier converts the unit to a monophonic or single channel. The amplifier can be used with 8 Ohm or higher loads only in Mono Bridge 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: VOLTAGE OVER 100 VOLTS MA Y BE PRODUCED A T THE BRIDGE OUTPUT TERMINALS IN THIS MODE.

1. With the power off, set the OPERATION MODE SWITCH (3) to the

BRIDGE position. When the power is on, the BRIDGE LED (13) on

the front panel will light. If the LED does not illuminate, you have the

switch in the wrong position. Correct before continuing.

2. With the power off, connect your input cables to channel A input

only using the either the XLR INPUT JACK (5) or 1/4" INPUT JACK

(4) of channel A. The other channel A input can be used to link to an

additional amplifier.

3. Connect the loudspeaker to the BRIDGE SPEAKER OUTPUT (10)

only. With a 230V unit, use the center speakon. With a 120V unit,

use the two innermost red terminals. Be sure the polarity of your

connections is correct. The total speaker load must be at least 4

Ohms or above. 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 A LEVEL CONTROL (17) set to zero (fully

counterclockwise), switch the power on. Apply a signal to the input.

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 CONTROL (17) for channel A 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 channel A or reduce the level at the

source. During Mono Bridge operation, the channel B level is

inactive, however, both channels LEDs will flash simultaneously and

show output conditions.

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Using the Signal 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 SIGNAL GROUND LIFT

SWITCH (8) in the left position).

2. Then turn the power off before moving the SIGNAL GROUND

LIFT SWITCH (8). Lift the ground by moving the SIGNAL GROUND

LIFT SWITCH to the right, turn the power back on and listen to

determine which position will provide a signal devoid of background

noise and hum. Keep the SIGNAL GROUND LIFT SWITCH 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 . TERMINA TION OF THE AC GROUND CAN BE HAZARDOUS.

Specifications

Output Power EIA: 1 kHz @ 1% THD

XPB-750 XPB-1600 Single Channel 8Ω 190 340 Both Channels Driven 8Ω 175 300 Single Channel 4Ω 325 600 Both Channels Driven 4Ω 275 500 Single Channel 2Ω 470 950 Both Channels Driven 2Ω 360 800 Mono Bridge 8Ω 550 1000 Mono Bridge 4Ω 750 1600

Dynamic Headroom: XPB-750 XPB-1600 8Ω 1.3 1.3 4Ω 2.3 2.1

Frequency Response............................................................20 Hz - 20 kHz

Total Harmonic Distortion...............................less than 0.01% @ 1 kHz

Intermodulation Distortion.......................less than 0.02% (SMPTE)

Signal to Noise Ratio..........................100 dB below rated power @ 8Ω

Damping Factor (XPB-750)........................greater than 500 @ 8Ω

Damping Factor (XPB-1600)..............................greater than 800 @ 8Ω

Slew Rate.................................................................................16 V/µS

Voltage Gain....................................................................33 dB

Input Sensitivity (for rated power at 8 Ohm):

XPB-750 XPB-1600

0.82 VRMS 1.1 VRMS

Input Impedance Unbalanced....................................................10 kOhms

Input Impedance Balanced.......................................................20 kOhms

Power consumption: XPB-750 XPB-1600

550 VA 1000 VA

Note: power consumption is given at rated power at 8Ω per channel, both channels driven.

AC Power Requirement:

(power connection is factory configured)............................120V/ 60 Hz

Indicators.......................................................................1 Power Indicator

1 Signal LED per channel

1 Clip LED per channel

1 Protect LED per channel

Cooling....................................2 Speed Dual Fan; Front-to-Rear Forced Air

Protection...........Short Circuit, DC, Thermal Cut-off, Sub/ultrasonic

Frequency Filters, In-rush Current Limiter, Turn-on Delay,

main fuse, secondary DC supply fuses

Connectors:

Balanced/Unbalanced Inputs....................................1/4" Jack

Balanced Inputs............................................XLR Female Jack

Speaker Outputs (120V unit)..........................................5-way binding posts

Speaker Outputs (230V unit)...........Speakons (ch.A, ch.B and bridge)

Dimensions...................................19" x 13.75" x 3.5" (483 x 350 x 89 mm)

Weight XPB-750 XPB-1600

27 lbs 34 lbs

12.34 kg 15.5 kg

* Specifications and design are subject to change without notice for purpose of improvement.

230V/ 50 Hz

1 Mono LED

1 Bridge LED

Page 6

SYMPTOM CAUSE SOLUTION

UNIT DOES NOT PRODUCE SOUND. POWER LED DOES NOT LIGHT.

POWER LED LIGHTS, BUT NO SOUND IS PRODUCED BY AMPLIFIER.

SOUND IS PRESENT BUT VOLUME IS TOO LOW EVEN THOUGH SOURCE DEVICE IS SET TO A HIGH LEVEL.

LOUD 50/60 HZ OR 100/120 HZ HUM IS HEARD AT ALL TIMES THROUGH THE SPEAKER SYSTEMS.

• POWER SWITCH NOT IN ON POSITION.

• POWER CABLE NOT CONNECTED TO AMPLIFIER OR TO OUTLET.

• AC OUTLET NOT ACTIVE.

• MAIN AMPLIFIER FUSE DEFECTIVE.

• NO INPUT SOURCE SIGNAL.

• INPUT SOURCE NOT CONNECTED.

• INPUT CONNECTING CABLE DEFECTIVE.

• SPEAKER(S) NOT CONNECTED.

• SPEAKER CABLE DEFECTIVE.

• SPEAKER SYSTEM(S) INOPERATIVE.

• AMPLIFIER’S LEVEL CONTROLS ARE SET TO ZERO.

• AMPLIFIER INPUT LEVEL CONTROLS ARE SET TOO LOW.

• WRONG PIN CONNECTIONS IN CABLES.

• IMPROPER OR DEFECTIVE GROUND CONNECTION AT INPUTS. IMPROPER OR DEFECTIVE GROUND AT INPUT SOURCE DEVICE(S).

• IMPROPER OR DEFECTIVE GROUND CONNECTION ON AC OUTLET.

• GROUND LOOP THROUGH AC LINE CONNECTION/ RACK MOUNTING.

• MOVE POWER SWITCH TO ON POSITION.

• CONNECT POWER CABLE TO AC SUPPLY.

• CHECK CONDITION OF OUTLET.

• REPLACE AMPLIFIER MAIN POWER FUSE ON REAR PANEL WITH CORRECT TYPE AND RATING.

• CHECK FOR PROPER FUNCTION OF INPUT SOURCE DEVICE.

• CHECK INPUT CABLES AND CONNECTIONS. REPLACE QUESTIONABLE CABLES WITH KNOWN GOOD CABLES.

• CHECK SPEAKER CABLES AND CONNECTIONS. REPLACE QUESTIONABLE CABLES WITH KNOWN GOOD CABLES.

• CHECK OPERATING CONDITION AND STATUS OF SPEAKER SYSTEM(S). BE SURE THE LEVEL CONTROLS ARE PROPERLY SET.

• ADJUST LEVEL CONTROLS AS PER INSTRUCTIONS.

• USE CORRECT CABLES (AS SHOWN ON BACK OF UNIT).

• CHECK FOR PROPER AC LINE GROUND ON POWER AMP AND ALL INPUT DEVICES.

• CHECK INPUT CABLES FOR ALL SOURCE DEVICES AND SIGNAL PROCESSING AS WELL AS INPUT CABLES TO POWER AMPLIFIER. CHECK POSITION OF GROUND LIFT SWITCH AS PER INSTRUCTIONS FOR LIFTING THE GROUND.

• NEVER LIFT THE AC LINE GROUND ON THE POWER AMPLIFIER. IF YOU ARE NOT TOTALLY FAMILIAR WITH GROUND LIFTING OR UNIFICATION PROCEDURES, DO NOT ATTEMPT THEM WITHOUT FIRST CONSULTING YOUR DEALER OR A QUALIFIED SOUND TECHNICIAN FOR MORE INFORMATION ON GROUNDING. IMPROPERLY DONE, SUCH PROCEDURES CAN POSE A SAFETY AND/OR FIRE HAZARD.

SOUND IS DISTORTED.

PROTECT LED REMAINS LIT OR GOES ON AND OFF INTERMITTENTLY AFTER USING AMPLIFIER FOR A SHORT TIME.

FUSE BLOWS INTERMITTENTLY.

PROTECT LED(S) STAY ON WITH NO SPEAKERS CONNECTED AND WITH THE AMPLIFIER COOLED DOWN.

POWER LED LIGHTS BUT THERE IS NO SOUND FROM ONE OR BOTH CHANNELS.

• DISTORTION OCCURRING IN SOURCE DEVICE.

• INPUT LEVEL IS SET TOO HIGH.

• UNIT IS OPERATING AT EXCESSIVELY HIGH TEMPERATURE.

• EXTREMELY LOW SPEAKER IMPEDANCE.

• SHORT IN SPEAKER CONNECTORS, SPEAKER CABLE OR SPEAKER SYSTEM.

• SPEAKER LOAD IMPEDANCE IS TOO LOW.

• TYPE OR RATING OF THE FUSE IS NOT CORRECT.

• FAILED AMPLIFIER.

• SECONDARY DC FUSES ARE BLOWN (ON EITHER ONE OR BOTH CHANNELS INDICATING FAILED A FAILED CHANNEL OR CHANNELS.

• CHECK CLIP INDICATORS ON INPUT SOURCE DEVICES AND RESET LEVELS IF NECESSARY TO ELIMINATE DISTORTION.

• ADJUST LEVEL CONTROLS AS PER INSTRUCTIONS.

• CHECK THAT AMPLIFIER IS ADEQUATELY VENTILATED ON THE FRONT AND REAR PANELS WHERE THE AIR VENTS AND FANS ARE LOCATED. IF OVERHEATED, LET THE AMPLIFIER COOL DOWN BEFORE APPLYING AN INPUT SIGNAL.

• CHECK THE POSITION OF OPERATION MODE SWITCH. BE SURE THAT THE SPEAKER CONNECTIONS ARE MADE IN ACCORDANCE WITH THE SWITCH SETTING.

• VERIFY SPEAKER SYSTEM IMPEDANCES. BE SURE THE TOTAL SPEAKER SYSTEM IMPEDANCE IS AT LEAST 4 OHMS PER CHANNEL WHEN THE OPERATION MODE SWITCH IS IN THE STEREO POSITION OR PARALLEL MONO POSITION. IF THE SWITCH IS IN THE BRIDGE MODE, THE IMPEDANCE MUST BE AT LEAST 8 OHMS. IF YOU ARE NOT SURE OF YOUR TOTAL SPEAKER IMPEDANCE LOAD, CONTACT YOUR DEALER FOR MORE INFORMATION.

• CHECK CONDITION OF SPEAKER CABLES.

• IF USING BARE WIRE CONNECTIONS ON THE OUTPUTS OF THE AMPLIFIER, BE SURE THAT NO STRANDS FROM ONE CONNECTOR ARE TOUCHING ANY OTHER CONNECTOR.

• CHECK FOR SHORTS ON THE OUTPUTS.

• CHECK YOUR SPEAKER IMPEDANCE (INFO FROM DEALER).

• CHECK THAT THE FUSE TYPE AND RATING IS CORRECT.

• CONTACT THE GEMINI SERVICE DEPARTMENT OR YOUR AUTHORIZED DEALER TO SPEAK TO A QUALIFIED SERVICE TECHNICIAN.

• IF ONLY ONE CHANNEL FAILS, THE SECOND MAY STILL OPERATE, BUT THE UNIT SHOULD BE SERVICED AS SOON AS POSSIBLE. CONTACT THE GEMINI SERVICE DEPARTMENT OR YOUR AUTHORIZED DEALER TO SPEAK TO A QUALIFIED SERVICE TECHNICIAN.

Page 7

Einleitung

Anschlüsse, Regler und Anzeiger

Wir gratulieren Ihnen zum Kauf eines Gemini XPB Endverstärkers. Dieser moderne Endverstärker enthält die neuesten Funktionen und eine dreijährige, begrenzte Garantie. Vor Anwendung dieses Gerätes bitte alle Anweisungen sorgfältig durchlesen.

Funktionen

• Neueste Technologie bietet außergewöhnliche Zuverlässigkeit beim

Arbeiten mit komplizierten Lautsprechern mit Impedanzen bis zu 2

Ohm.

• Ausgezeichnete Wiedergabe von Tief- und Mittelfrequenzen sowie

von hohen Frequenzen.

• Hohe Ausgangsleistung, um professionelle Lautsprecher ohne

Übersteuerung zu betreiben

• Überdimensionierte Ringkerntransformatoren, Filter und Kühlkörper

für bessere Basswiedergabe, Transparenz und Betriebssicherheit

• Umfassender Schutzschaltungsaufbau (gegen Kurzschluß,

Überhitzung, Gleichstrom, Ultraschall- und Funkfilter,

Einschaltverzögerung) mit Hochstrom-Lautsprecher-Schutzrelais

• Drei Betriebsarten - Stereo, Parallel Mono und Mono gebrückt mit

Betriebszustandanzeige-LEDs an der Vorderseite

• Flexible Eingangskonfiguration mit symmetrischen Eingängen;

zusätzlichen Eingangsanschlüssen, um Verstärker zu verketten

(Parallel-Betrieb)

• Echte Übersteuerungs-LEDs für bessere Pegelkontrolle

• Durchgehende Luftströmung mit Doppelventilatoren mit

Zweigeschwindigkeits-Regelung

• Effiziente Kühlung in zweifacher Alu-Strangpreßausführung bietet

Wärmebeständigkeit und Zuverlässigkeit

• Einschaltstrom-Begrenzerschaltkreis

• Kompaktes, ausbalanciertes Gehäuse mit 2 HE

• Stahlverstärkte Chassisausführung für Steifigkeit und Langlebigkeit

Rückseite

Hinweis: 120-V- und 230-V-Einheiten haben unterschiedliche Ausgangsanschlüsse an der Rückseite.

Eingangsbereich:

Jeder Kanal hat zwei parallele Eingangsanschlüsse (eine XLRBuchse und eine Klinken-Buchse). Sie können beide als Eingang oder Verbindung zur Verkettung von Verstärkern benutzt werden.

XLR-Eingangsbuchsen (1, 5): Elektronisch symmetrische Eingänge

nehmen einen XLR-Standardstecker auf. Stift 1 = Abschirmung/

Masse, Stift 2 = heiß bzw. plus (+), 3 = kalt bzw. minus (-). 6,3mm-Klinken-Eingangsbuchsen (2, 4): Diese Buchsen nehmen

symmetrische sowie unsymmetrische Leitungseingangssignale auf.

Die unsymmetrische Leitung benutzt eine Standard-Spitzen-Muffen-

Verbindung. Die Spitze ist signalführend und die Muffe ist geerdet.

Die symmetrische Leitung benutzt eine Spitzen-Ring-Muffen-

Verbindung. Spitze = heiß bzw. plus (+), Ring = kalt bzw. minus (-)

und Muffe = Abschirmung/Masse. Betriebsart-Schalter (3): Mit diesem Schalter wird die Einheit in die

Betriebsarten Stereo, Parallel Mono oder Mono gebrückt eingestellt.

Netzstrom:

Sicherung (7): Beim Auswechseln der Sicherung ist darauf zu achten,

daß die Sicherungsart und -wert korrekt sind. Der Signalmasse-Trennschalter (8) wird benutzt, um die Masse/

Abschirmung der symmetrischen Eingangssteckverbindungen von

der Masse des Verstärkers zu trennen. Wenn die Signalmasse

getrennt ist, wird die Klangquelle von der Masse der Verstärker

getrennt, wodurch Masseschleifen verhindert werden, die Brummen

und Störungen verursachen. Einzelheiten finden Sie in den

Anweisungen für den Signal-Massetrennschalter.

Netzanschluß-Kaltgerätebuchse (6) (Hinweis: Nur für 230-V-

Einheiten) Diese Buchse wird benutzt, um die Netzleitung an dem

Gerät anzuschließen.

Vorsichtsmaßnahmen

Vor Anwendung des Geräts lesen Sie bitte alle Anweisungen sorgfältig durch.

Um das Risiko elektrischen Schocks zu vermeiden, dürfen Sie das Gerät nicht öffnen. DAS GERÄT ENTHÄLT KEINE VOM ANWENDER ERSETZBAREN TEILE. Wenden Sie sich bitte an authorisierte Gemini Service Werkstätten oder an Ihren Vertragshändler, um mit einem befähigten Wartungstechniker zu sprechen.

Stellen Sie sicher, daß die Vorder- und Rückseite gut belüftet sind, um mögliche Beschädigung der Ausrüstung durch Überhitzen zu vermeiden.

Stellen Sie sicher, daß der Netzstrom ausgeschaltet ist und alle Tonstärkenregler auf MINIMUM geschaltet sind. Dies wird die Möglichkeit unerwarteter, lauter Einschwingungen eliminieren, die das Lautsprechesystem beschädigen könnten.

Stellen Sie sicher, daß der Netzstrom ausgeschaltet ist, wenn die Betriebsarten und die Position des Massetrennschalters geändert werden.

DAS GERÄT NIEMALS REGEN ODER FEUCHTIGKEIT AUSSETZEN. Bediener von elektronischen Geräte dürfen unter keinen Umständen Kontakt mit Wasser haben.

Beim Anschluß der Netzleitung sicherstellen, daß der Masseanschluß nicht verlorengeht, wenn eine Adapter- oder Verlängerungsschnur ohne Dreistiftstecker benutzt wird.

KEIN REININGSSPRAY ODER SCHMIERMITTEL AN DEN REGLERN ODER SCHALTERN VERWENDEN.

Lautsprecher-Anschlüsse

Bevor jegliche Verbindungen hergestellt werden, muß das Gerät von der Stromversorgung getrennt werden. Beim Anschluß der Lautsprecher ist besonders auf die Polarität zu achten (wie an der Rückseite der Einheit dargestellt. Wird das Lautsprechersystem mit falscher Polarität angeschlossen, werden dadurch die Lautsprecher zwar nicht beschädigt, doch wird dies einen Einfluß auf die Tonqualität ausüben (kein Baßton und falsches Stereo-Image).

Lautsprecher-Ausgänge für 120-V-Einheiten (9, 10, 11): Die

Lautsprecher-Ausgangsbuchsen sind fünfpolige Polklemmen, die

Standard-Bananenstecker, Gabelstecker oder blanke Drähte

aufnehmen. Sicherstellen, daß bei blanken Anschlüssen alle

Anschlüsse sauber sind. Falls irgendwelche Litzen oder Drähte eines

Anschlusses den benachbarten Anschluß berühren, ergibt sich eine

Klangverzerrung und der Verstärker wird sich überhitzen und in den

Schutzmodus umschalten. Lautsprecher-Ausgänge für 230-V-Einheiten (9, 10, 11): Neutrik

Speakon-Anschlüsse sind vorgesehen, um die Lautsprecher schnell

und leicht am Verstärker anzuschließen. Sie sind hochbelastbar und

bieten feste und haltbare Kontakte. Ein dritter Speakon-Anschluß in

der Mitte ist vorgesehen, um im Mono Gebrückt-Modus angewendet

zu werden. Jeder Speakon-Anschluß hat einen Plus-Stift 1 (+) uns

einen Minus-Stift 1 (-).

HINWEIS: Die gesamte Lautsprecherimpedanz darf nicht geringer als 2 Ohm pro Kanal für die Betriebsarten Stereo und Parallel Mono sein, bzw. 4 Ohm für die Betriebsart Mono Gebrückt.

Die XPB-Verstärker sind konstruiert worden, um niederohmige Lasten verarbeiten zu können, und werden mit den meisten 2-ohmigen Lautsprecher-/ Parallellautsprecher-Kombinationen normal funktionieren. Für optimale Leistung und Zuverlässigkeit empfehlen wir jedoch Lautsprecher mit höherer Impedanz.

Page 8

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Gemini XPB-750 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual