Gemini X1 Operation Manual

Also see for X1: Service manual

Contents

Gemini X1 Operation Manual Manual pdf 4 page image

(4)3. Connect the loudspeakers to the Channel 1 and Channel 2 SPEAKEROUTPUTS (5,7). THE TOTAL SPEAKER LOAD MUST BE AT LEAST 4OHMS PER CHANNEL. If you try to operate at a lower impedance, theamplifier will go into protection mode and stop operation until you correctthe load conditions.4. With the LEVEL CONTROLS (12,15) of both channels set to zero (fullycounterclockwise), turn the POWER SWITCH (9) on. Apply a signal tothe input of the amplifier. The level of the input signal should be as highas you will ever need it to be. This way, it will be as high above theamplifier’s noise floor as possible, ensuring an excellent performanceand signal to noise ratio. Adjust the LEVEL CONTROLS (12,15) for eachchannel to achieve the desired maximum listening level. Note, when theCLIP LED (14) light, there is distortion present in the amplifier’s outputsection. If a CLIP LED (14) remains on or flashes repeatedly, reduce thesignal level by lowering the input level control for the channel that isclipping or reduce the level at the source.PARALLEL MONO OPERATION:Follow these instructions for Parallel Mono Operation using a singleinput cable, and you will have the same monophonic signal on both theChannel 1 and the Channel 2 outputs. Each channel’s output iscontrolled independently by that channel’s level control.1. With the power off, set the OPERATION MODE SWITCH (3) to theParallel Mono position.2. With the power off, connect your input cables to the Channel 1 inputonly using the 1/ 4" INPUT JACK (1) of Channel 1.3. Connect the loudspeakers to the Channel 1 and Channel 2 SPEAKEROUTPUTS (5, 7). THE TOTAL SPEAKER LOAD MUST BE AT LEAST 4OHMS PER CHANNEL. If you try to operate at less than 4 Ohms perchannel, the amplifier will go into the protection mode and stop operationuntil you correct the load conditions.4. With the LEVEL CONTROLS (12,15) set to zero (fully counterclockwise),switch the POWER (9) on. Apply a signal to the input. The level of theinput signal should be as high as you will ever need it to be. This way, itwill be as high above the amplifier’s noise floor as possible, ensuring anexcellent performance and signal to noise ratio. Adjust the LEVELCONTROLS (12,15) for each channel to achieve the desired maximumlistening level. Note, when the CLIP LED (14) light, there is distortionpresent in the amplifier’s output section. If a CLIP LED (14) remains on orflashes repeatedly, reduce the signal level by lowering the input levelcontrol for the channel that is clipping or reduce the level at the source.MONO BRIDGE OPERATION:Follow these instructions to bridge the unit’s output. Bridging theamplifier converts the unit to a monophonic or single channel amplifier .The amplifier can be used with 8 Ohm or higher loads only in MonoBridge mode. This mode is used to provide a higher voltage withgreater headroom to your speaker. Before setting your amplifier forMono Bridge operation, make sure that your speaker can handle thehigh power level provided by the amplifier in Mono Bridge mode.CAUTION: VOLTAGE OVER 100 VOLTS MAY BE PRODUCED AT THE BRIDGE OUTPUTTERMINALS IN THIS MODE.1. With the power off, set the OPERATION MODE SWITCH (3) to theBRIDGE position.2. With the power off, connect your input cables to Channel 1 input onlyusing the 1/4" INPUT JACK (1) of channel 1.3. Connect the loudspeaker to the BRIDGE SPEAKER OUTPUT (6) only. Besure the polarity of your connection is correct. The total speaker loadmust be at least 8 Ohms or above. If you try to operate at less than 8Ohms in the Mono Bridge mode, the amplifier will go into theprotection mode and stop operation until you correct the load conditions.4. With the Channel 1 LEVEL CONTROL (15) set to zero (fullycounterclockwise), 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 itto be. This way, it will be as high above the amplifier’s noise floor aspossible, ensuring an excellent performance and signal to noise ratio.Adjust the LEVEL CONTROL (15) for Channel 1 to achieve the desiredmaximum listening level. Note, when the CLIP LED (14) light, there isdistortion present in the amplifier’s output section. If a CLIP LED (14)remains on or flashes repeatedly, reduce the signal level by lowering theinput level control for Channel 1 or reduce the level at the source.During Mono Bridge operation, the Channel 2 level is inactive,however, both channels’ LED will flash simultaneously and show outputconditions.USING THE GROUND LIFT SWITCH:Depending on your system configuration, sometimes applying theground will create a quieter signal path. Sometimes lifting the groundcan 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 GROUND LIFT SWITCH (4) in the left position).2. Turn the power off before moving the GROUND LIFT SWITCH (4). Lift theground by moving the GROUND LIFT SWITCH (4) to the right, turn the powerback on and listen to determine which position will provide a signal free ofbackground noise and hum. Keep the GROUND LIFT SWITCH (4) in theground position if the noise level remains the same in either position.CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER AMPLIFIER IN ANY WAY.TERMINATION OF THE AC GROUND CAN BE HAZARDOUS.SPECIFICATIONS:X1 X2 X3 X4Output Power EIA:.................................................1kHz @ 1% THD, WrmsBoth Channels Driven 8Ω 85 140 200 200Both Channels Driven 4Ω 110 200 300 300Mono Bridge 8Ω 220 400 600 600Dynamic Headroom, dB:At8Ω 1.4 1.5 1.6 1.6At4Ω 1.9 2.0 2.2 2.2Frequency Response..........................................................30 Hz - 50 kHzTotal Harmonic Distortion.............Iess than 0.05%, typical 0.02% @ 1 kHzSignal to Noise ratio.............................100 dB below rated power @ 8ΩDamping factor.......................................................greater than 200 @ 8ΩSlew rate........................................................................................20 V/μSVoltage gain, dB 28 30 32 32Input Sensitivity (for rated power at 8Ω).........................................1 VrmsInput Impedance Unbalanced.............................................................10 kΩInput Impedance Balanced.................................................................20 kΩPower consumption, W 500 800 1200 1200(at rated power at 4Ω, both channels driven)AC Power Requirements..........110-120 V / 60 Hz and 220-240 V / 50 HzIndicators:...............................................................................1 Power LED...............................................................................................1 Protect LED..................................................1 Signal LED per Channel (for X1, X2, X3).................................................................1VU-meter per Channel (for X4)Cooling........................................................ Fan, Front-to-Rear Forced AirProtection:.............................................Short Circuit, DC, Thermal Cut-off,...............................................................Sub/Ultrasonic Frequency Filters,.......................................Turn-on Delay, Main Fuse, Secondary DC FusesConnectors:Balanced/Unbalanced lnputs........................................................1/4" JackSpeaker Outputs........................................................5-way Binding PostsDimensions:X1, X2, X3...........................19"W x 10.75"D x 3.5"H (483 x 273 x 89 mm)X4....................................19"W x 10.75"D x 5.25"H (483 x 273 x 133 mm)Weight 16.3 Ibs 17.8 Ibs 20.2 Ibs 21.6 Ibs7.4 kg 8.1 kg 9.2 kg 9.8 kgSPECIFICATIONS AND DESIGN ARE SUBJECT TO CHANGE WITHOUT NOTICE FOR PURPOSEOF IMPROVEMENT