Gemini P-07 Operation Manual

Contents

(4)INTRODUCTION:Congratulations on purchasing your Gemini Power Amplifier. This stateof-the-art power arnplifier includes the latest features and is backed bya three year limited warranty. Prior to use, we suggest that youcarefully read all the instructions.FEATURES:• State-of-the-art circuitry for the finest sound quality and reliability• Protection Circuitry (short circuit, thermal cutoff, sub/ultrasonic frequency filters, turn-ondelay, main fuse, secondary fuses)• Unbalanced stereo inputs with RCA type jacks• Signal ground lift switch eliminates hum from connection loops• Large blue-light illuminated VU meters to give you greater control• Ultra-modern design with professional 19" rack mounts• Front-to-rear airflow with variable speed fan control for maximum cooling and quietest possible operation• Compact 2U well balanced enclosure• Steel reinforced chassis construction for durability and longevityCAUTIONS:1. Read all operating instructions before using this equipment.2. To reduce the risk of electrical shock, do not open the unit. There areNO USER REPLACEABLE PARTS INSIDE. Please contact the GeminiCustomer Service Department or your authorized dealer to speak to aqualified Gemini Sound Products technician.3. Be sure to allow adequate front and rear ventilation to avoid possibleheat damage to your equipment.4. Be sure that AC power is OFF and all level controls are set to MINIMUMbefore making connections. This will eliminate any chance of unexpected,loud audio transients that could damage your speaker systems.IN THE USA: IF YOU EXPERIENCE PROBLEMS WITH THIS UNIT,PLEASE CALL 1 (732) 738-9003 FOR GEMINI CUSTOMER SERVICE.DO NOT ATTEMPT TO RETURN THIS EQUIPMENT TO YOUR DEALER.5. Be sure that AC power is OFF when changing modes of operationand when changing the position of the Ground Lift Switch.6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. Operators ofelectronic equipment should in no way be in contact with water.7. When connecting to AC power line be sure you haven’t lost the groundconnection by using an adapter or extension cord without a 3 prong plug.8. DO NOT USE ANY SPRAY CLEANER OR LUBRICANT ON ANYCONTROLS OR SWITCHES.CONNECTIONS:REAR PANELAC POWER SECTION:AC INLET: AC INLET (1) is used to attach the power cord to the unit.FUSE: FUSE (2) replace with proper type and rating.AC LINE VOLTAGE SWITCH: AC LINE VOLTAGE SWITCH (3) allowsreconfiguring amplifier for either 110-120 V or 220-240 V AC lines.GROUND LIFT SWITCH: GROUND LIFT SWITCH (4) is used to lift theground from the chassis.(SEE THE GROUND LIFT SWITCH INSTRUCTIONS FOR MORE DETAIL.)INPUT SECTION:RCA INPUT JACKS: Your amplifier has unbalanced stereo RCA (5) typejacks, with the tip of the jack being positive (+) and the sleeve part beingnegative (-), ground. Connect the output of your mixer here.OUTPUT SECTION:Disconnect unit from the AC power source before making anyconnections. Pay close attention to polarity when connecting yourspeakers. (Connect the positive wire to the red terminal and thenegative wire to the black terminal). Connecting your speakers usingthe wrong polarity will not damage your speakers, but will impact thequality of the sound (lack of bass and incorrect stereo image).SPEAKER OUTPUTS: The SPEAKER OUTPUT (6) connectors areterminals that will accept a standard banana plug, or bare wire. Makesure that all the connections are clean when using bare wire connections.If any strands of wire from one connector touch the connector next to it,the sound will distort, and your amplifier will overheat.NOTE: TOTAL SPEAKER IMPEDANCE MUST NOT BE LOWER THAN 4ΩΩΩΩΩ (OHM) PER CHANNEL.FRONT PANEL:POWER SWITCH: POWER SWITCH (7) turns the unit on and off.POWER LED: The POWER LED (8) lights when the power is on. If thePOWER LED (8) does not light, refer to the trouble-shooting guide.LEVEL CONTROLS: LEVEL CONTROLS (9) control the input levels foreach channel.VU METERS: Large blue-light illuminated VU METERS (10) display theoutput level of each channel.OPERATION:STEREO OPERATION:The unit has two channels for stereo operation. Each channel providesa separate signal at the speaker outputs. The following instructions arefor use with 4ΩΩΩΩΩ or 8ΩΩΩΩΩ speakers of matched power ratings.1. With the power OFF, connect your input cables to the CHANNEL A andCHANNEL B inputs using the RCA INPUT JACKS (5)2. Connect your speakers to the CHANNEL A and CHANNEL B SPEAKEROUTPUTS (6). THE TOTAL SPEAKER LOAD MUST BE AT LEAST 4ΩΩΩΩΩPER CHANNEL.3. With the LEVEL CONTROLS (9) of both channels set to zero (fullycounterclockwise), turn the POWER SWITCH (8) ON. With the levelcontrols of your MIXER or other INPUT device turned all the way DOWN,turn the amplifier level controls all the way up for desired loudness fromyour speakers.4. Now adjust your MIXER or other INPUT source to your desired listeninglevel. You also have the choice of keeping the volume of both speakersequal, or for certain situations you can adjust the volume so one side willbe louder than the other.USING THE GROUND LIFT SWITCH:Depending on how your sound system is hooked up, sometimesapplying the ground will create a quieter signal path. Sometimes liftingthe ground can eliminate ground loops and that annoyinghum to give you quieter and cleaner overall sound.1. With the power amp ON, listen to the system in idle mode (no music orsignal) with the ground ON. The GROUND LIFT SWITCH (4) will be inthe left position.2. Turn the power OFF before moving the GROUND LIFT SWITCH (4). Nowlift the ground by moving the GROUND LIFT SWITCH to the right. Turnthe power back ON and listen to determine which position makes theoverall sound quieter with the least amount of noise and hum.CAUTION: DO NOT DISCONNECT THE AC GROUND ON THE POWER AMPLIFIER IN ANY WAY.THIS CAN BE VERY HAZARDOUS!!SPECIFICATIONS:Output Power EIA: 1kHz @ 1% THD, WrmsBoth Channels Driven 8Ω:...……….……...........................................................…………………………70Both Channels Driven 4Ω:……................................….…..............................……………………………90Dynamic Headroom, dB:At 8Ω:……………………………..................................……………..………….........................…………1.5At 4Ω:…………………………..................................…...........................…………………………………3.3Frequency Response:.........................................................………………………………..30 Hz – 50 kHzTotal Harmonic Distortion:........................................…................less than 0.1%, typical 0.05% at 1 kHzSignal to Noise ratio:.................................……………........................…90 dB below rated power @ 8ΩDamping factor: …………….........................................................………………..greater than 150 @ 8ΩSlew rate:………………………………………………….........................................................…….10 V/μSVoltage gain, dB:……………………................................……………………….........................………..27Input Sensitivity (for rated power at 8Ω):……..........................................................…….…...…….1VrmsInput Impedance (unbalanced):...………................................……………..........................…………10 k.Power consumption (at rated power at 4Ω, both channels driven):..........……………………......…400 WAC Power Requirements:........................…………..….................….110-120 V or 220-240 V 60 / 50 Hz.Indicators:……...................…...…………........................…………1VU-meter per Channel 1 Power LEDCooling: ……..........................................................………Variable Speed Fan, Front-to-Rear Forced AirProtection:...................Short Circuit, Thermal Cut-off, Sub/Ultrasonic Frequency Filters, Turn-on Delay,Main Fuse, Secondary DC FusesConnectors:Inputs:………………...............................…………………………..........................…………….RCA JacksSpeaker Outputs:……………………………..........................................................………….Binding PostsDimensions:…………....…………........................…...………..19"W x 11"D x 3.5"H (483 x 280 x 89 mm)Weight :…………………………..........................………................................…………..12.9 lbs (5.85 kg)SPECIFICATIONS AND DESIGN ARE SUBJECT TO CHANGEWITHOUT NOTICE FOR PURPOSE OF IMPROVEMENT.