Gemini Sound P-700 Owners manual
OPERATIONS MANUAL
BEDIENUNGSHANDBUCH
MANUAL DEL OPERADOR
MANUEL D’INSTRUCTIONS
P-700
POWER AMPLIFIER
STEREO VERSTÄRKER
AMPLIFICADOR DE PODER ESTEREO
AMPLIFICATEUR DE PUISSANCE STÉRÉO
MULTI LANGUAGE INSTRUCTIONS:
English...............................................................................................................Page 4
Deutsch.............................................................................................................Page 6
Español..............................................................................................................Page 8
Francais..........................................................................................................Page 10
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FRONT:
REAR:
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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 circuitry for the finest sound quality and reliability
• High output power to drive professional speakers without clipping
• Protection Circuitry (short circuit, thermal cutoff, sub/ultrasonic frequency filters, turn-on
delay, 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 longevity
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.
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 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 SPRA Y CLEANER OR LUBRICANT ON ANY
CONTROLS OR SWITCHES.
POWER LED (9): the power LED lights when the power is on. If the power
LED does not light, refer to the trouble-shooting guide.
LEVEL CONTROLS (7): controla the input levels for each channel.
VU METERS (8): Large blue-light illuminated VU METERS (8) display the
output level of each channel.
OPERATION:
STEREO OPERA TION:
The unit has two channels for stereo operation. Each channel provides
a separate signal at the speaker outputs. The following instructions are
for use with 4 or 8. speakers of matched power ratings.
1. With the power OFF, connect your input cables to the Channel A and
Channel B inputs using the RCA INPUT JACKS (1)
2. Connect your speakers to the Channel A and Channel B SPEAKER
OUTPUTS (3). THE TOT AL SPEAKER LOAD MUST BE AT LEAST 4
PER CHANNEL.
3. With the LEVEL CONTROLS (7) of both channels set to zero (fully
counterclockwise), turn the POWER SWITCH (10) ON. Okay, now try
playing some music and/or talking into your microphone, and set the level
of your input as high as you think you’ll need it. This way it will be
as high above the amplifier’s noise floor as possible so you’ll get the
best possible sound with the least amount of noise.
4. Now adjust your LEVEL CONTROLS (7) for each channel to your
desired listening level. You also have the choice of keeping the volume
of both speakers equal, or for certain situations you can adjust the
volume so one side will be louder than the other.
ΩΩ
Ω
ΩΩ
USING THE GROUND LIFT SWITCH:
Depending on how your sound system is hooked up, sometimes
applying the ground will create a quieter signal path. Sometimes lifting
the ground can eliminate ground loops and that annoying
hum to give you quieter and cleaner overall sound.
1. With the power amp ON, listen to the system in idle mode (no music or
signal) with the ground ON. The GROUND LIFT SWITCH (2) will be in
the left position.
2. Turn the power OFF before moving the GROUND LIFT SWITCH (2). Now
lift the ground by moving the GROUND LIFT SWITCH to the right. Turn
the power back ON and listen to determine which position makes the
overall 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!!
CONNECTIONS:
REAR P ANEL INPUT SECTION:
INPUT JACKS (1): Your amplifier has unbalanced stereo RCA type jacks,
with the tip of the jack being positive (+) and the sleeve part being
negative (-), ground. Connect the output of your mixer here.
OUTPUT SECTION:
Disconnect unit from the AC power source before making any
connections. Pay close attention to polarity when connecting your
speakers. (Connect the positive wire to the red terminal and the
negative wire to the black terminal). Connecting your speakers 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): the speaker output connectors are terminals that
will accept a standard banana plug, 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 connector next to it, the
sound will distort, and your amplifier will overheat.
NOTE: TOTAL SPEAKER IMPEDANCE MUST NOT BE LOWER THAN 4. (OHM) PER CHANNEL.
AC POWER SECTION:
FUSE (4): replace with proper type and rating.
AC INLET (6): is used to attach the power cord to the unit.
AC LINE VOLTAGE SWITCH (5): allows reconfiguring amplifier for either
110-120 V or 220-240 V AC lines.
GROUND LIFT SWITCH (2): is used to lift the ground from the chassis.
(See the Ground Lift Switch Instructions for more detail.)
FRONT P ANEL:
POWER SWITCH (10): turns the unit on and off.
SPECIFICATIONS:
Output Power EIA: 1kHz @ 1% THD, Wrms
Both Channels Driven 8.: ………….……................................…………………………70
Both Channels Driven 4.: ………................................….………………………………90
Dynamic Headroom, dB:
At 8.:………………………………..................................…………………………………1.5
At 4.:……………………………..................................……………………………………3.3
Frequency Response:...............................………………………………..30 Hz – 50 kHz
Total Harmonic Distortion:............…................less than 0.1%, typical 0.05% at 1 kHz
Signal to Noise ratio:.................................………………90 dB below rated power @ 8.
Damping factor: ……………................................………………..greater than 150 @ 8.
Slew rate:…………………………………………………................................…….10 V/µS
Voltage gain, dB:……………………................................………………………………..27
Input Sensitivity (for rated power at 8.):………...............................…….……….1Vrms
Input Impedance (unbalanced):...………................................………………………10 k.
Power consumption (at rated power at 4.,
both channels driven): ……………………...............................…………..……..…400 W
AC Power Requirements: …………….................….110-120 V or 220-240 V 60 / 50 Hz.
Indicators:……...................…...……………………1VU-meter per Channel 1 Power LED
Cooling: ……...............................………Variable Speed Fan, Front-to-Rear Forced Air
Protection:...............Short Circuit, Thermal Cut-off, Sub/Ultrasonic Frequency Filters,
.....................................................Turn-on Delay, Main Fuse, Secondary DC Fuses
Connectors:
Inputs:………………...............................……………………………………….RCA Jacks
Speaker Outputs:……………………………................................………….Binding Posts
Dimensions:…………....……………...………..19"W x 11"D x 3.5"H (483 x 280 x 89 mm)
Weight :…………………………………................................…………..12.9 lbs (5.85 kg)
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SPECIFICATIONS AND DESIGN ARE SUBJECT TO CHANGE
WITHOUT NOTICE FOR PURPOSE OF IMPROVEMENT.
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.
VERY LITTLE OR NO OUTPUT FROM
SUBWOOFER OR
NO BASS FROM FULL RANGE SPEAKERS
WHEN OPERATING WITHOUT
SUBWOOFERS.
LOUD 50/60 HZ OR 100/120 HZ HUM IS
HEARD AT ALL TIMES THROUGH THE
SPEAKER SYSTEMS.
SOUND IS DISTORTED.
PROTECT LED REMAINS LIT OR GOES ON
AND OFF INTERMITTENTL Y AFTER USING
AMPLIFIER FOR A SHORT TIME.
FUSE BLOWS INTERMITTENTL Y .
PROTECT LED(S) STAY ON WITH NO
SPEAKERS CONNECTED AND WITH THE
AMPLIFIER COOLED DOWN.
• 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.
• FREQUENCY SWITCH IS IN THE FULL RANGE
MODE POSITION.
• 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.
• 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.
• 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).
• MOVE THE FREQUENCY SWITCH TO THE 120 HZ
OR THE 180 HZ POSITION.
• 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 TOTALL Y F AMILIAR WITH
GROUND LIFTING OR UNIFICATION PROCEDURES,
DO NOT ATTEMPT THEM WITHOUT FIRST CONSUL TING
YOUR DEALER OR A QUALIFIED SOUND
TECHNICIAN FOR MORE INFORMATION ON
GROUNDING. IMPROPERLY DONE, SUCH
PROCEDURES CAN POSE A SAFETY AND/OR FIRE
HAZARD.
• CHECK CLIP INDICATORS ON INPUT SOURCE
DEVICES AND RESET LEVELS IF NECESSARY TO
ELIMINATE DISTO RTION.
• 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.
• VERIFY SPEAKER SYSTEM IMPEDANCES. BE SURE
THE TOTAL SPEAKER SYSTEM IMPEDANCE IS AT
LEAST 4 OHM PER CHANNEL FOR CHANNELS A AND
B, AND AT LEAST 2 OHM FOR THE SUBWOOFER
CHANNEL. 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. IN THE U.S.A.
CALL 1-732-738-9003
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