Gemini 2400, MM-1800 User Manual

19” 4 Channel Mixers

MM-1800/2400

OPERATIONS MANUAL
MANUAL DE INSTRUCCIONES
MANUEL D’INSTRUCTIONS
BEDIENUNGSHANDBUCH

FOR ENGLISH READERS Page 2 ~ Page 7
PARA LECTORES EN ESPAÑOL Página 8 ~ Página 11
UTILISATEURS FRANCAIS Page 12 ~ Page 15
FÜR DEUTSCHE LESER Seite 16 ~ Seite 19

MM-1800

MM-2400

CAUTION: This product satisfies FCC regulations when shielded cables and connectors are used to connect the unit to other equipment. To prevent electromagnetic interfer-

ence with electric appliances such as radios and televisions, use shielded cables and connectors for connections.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the liter-

ature accompanying the appliance.
The lightening flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the prod-

uct’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

READ INSTRUCTIONS: All the safety and operating instructions should be read before the product is operated.
RETAIN INSTRUCTIONS: The safety and operating instructions should be retained for future reference.
HEED WARNINGS: All warnings on the product and in the operating instructions should be adhered to.
FOLLOW INSTRUCTIONS: All operating and use instructions should be followed.
CLEANING: The product should be cleaned only with a polishing cloth or a soft dry cloth. Never clean with furniture wax, benzine, insecticides or other volatile liquids since

they may corrode the cabinet.

ATTACHMENTS: Do not use attachments not recommended by the product manufacturer as they may cause hazards.
WATER AND MOISTURE: Do not use this product near water, for example, near a bathtub, wash bowl, kitchen sink, or laundry tub; in a wet basement; or near a swimming

pool; and the like.

ACCESSORIES: Do not place this product on an unstable cart, stand, tripod, bracket, or table. The product may fall, causing serious injury to a child or adult, and serious dam-

age to the product. Use only with a cart, stand, tripod, bracket, or table recommended by the manufacturer, or sold with the product. Any mounting of the product should fol­low the manufacturer’s instructions, and should use a mounting accessory recommended by the manufacturer.

CART: A product and cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces may cause the product and cart combination to over-

turn. See Figure A.

VENTILATION: Slots and openings in the cabinet are provided for ventilation and to ensure reliable operation of the product and to protect it from overheating, and these open-

ings must not be blocked or covered. The openings should never be blocked by placing the product on a bed, sofa, rug, or other similar surface. This product should not be
placed in a built-in installation such as a bookcase or rack unless proper ventilation is provided or the manufacturer’s instructions have been adhered to.

POWER SOURCES: This product should be operated only from the type of power source indicated on the marking label. If you are not sure of the type of power supply to your

home, consult your product dealer or local power company.

LOCATION: The appliance should be installed in a stable location.
NON-USE PERIODS: The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time.
GROUNDING OR POLARIZATION:

• If this product is equipped with a polarized alternating current line plug (a plug having one blade wider than the other), it will fit into the out­let only one way. This is a safety feature. If you are unable to insert the plug fully into the outlet, try reversing the plug. If the plug should still
fail to fit, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the polarized plug.

• If this product is equipped with a three-wire grounding type plug, a plug having a third (grounding) pin, it will only fit into a grounding type
power outlet. This is a safety feature. If you are unable to insert the plug into the outlet, contact your electrician to replace your obsolete out­let. Do not defeat the safety purpose of the grounding type plug.

POWER-CORD PROTECTION: Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying par-

ticular attention to cords at plugs, convenience receptacles, and the point where they exit from the product.

OUTDOOR ANTENNA GROUNDING: If an outside antenna or cable system is connected to the product, be sure the antenna or cable system is grounded so as to provide

some protection against voltage surges and built-up static charges. Article 810 of the National Electrical Code, ANSI/NFPA 70, provides information with regard to proper
grounding of the mast and supporting structure, grounding of the lead-in wire to an antenna discharge unit, size of grounding conductors, location of antenna-discharge unit,
connection to grounding electrodes, and requirements for the grounding electrode. See Figure B.

LIGHTNING: For added protection for this product during a lightening storm, or when it is left unattended and unused for long periods of time, unplug it from the wall outlet and

disconnect the antenna or cable system. This will prevent damage to the product due to lightening and power-line surges.

POWER LINES: An outside antenna system should not be located in the vicinity of overhead power lines or other electric light or power circuits,

or where it can fall into such power lines or circuits. When installing an outside antenna system, extreme care should be taken to keep from
touching such power lines or circuits as contact with them might be fatal.

OVERLOADING: Do not overload wall outlets, extension cords, or integral convenience receptacles as this can result in a risk of fire or electric

shock.

OBJECT AND LIQUID ENTRY: Never push objects of any kind into this product through openings as they may touch dangerous voltage points

or short-out parts that could result in a fire or electric shock. Never spill liquid of any kind on the product.

SERVICING: Do not attempt to service this product yourself as opening or removing covers may expose you to dangerous voltage or other haz-

ards. Refer all servicing to qualified service personnel.

DAMAGE REQUIRING SERVICE: Unplug this product from the wall outlet and refer servicing to qualified service personnel under the following conditions:

• When the power-supply cord or plug is damaged.

• If liquid has been spilled, or objects have fallen into the product.

• If the product has been exposed to rain or water.

• If the product does not operate normally by following the operating instructions. Adjust only those controls that are covered by the operating instructions as an improper
adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore th

e product to its normal operation.

• If the product has been dropped or damaged in any way.

• When the product exhibits a distinct change in performance, this indicates a need for service.

REPLACEMENT PARTS: When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer or have the same

characteristics as the original part. Unauthorized substitutions may result in fire, electric shock, or other hazards.

SAFETY CHECK: Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper op-

erating condition.

WALL OR CEILING MOUNTING: The product should not be mounted to a wall or ceiling.
HEAT: The product should be situated away from heat sources such as radiators, heat registers, stoves, or other products (including amplifiers) that produce heat.

PLEASE READ BEFORE USING APPLIANCE

IMPORTANT WARNING AND SAFETY INSTRUCTIONS!

CAUTION

RISK OF ELECTRIC

SHOCK DO NOT

OPEN!

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MM-1800

PANEL SUPERIOR
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-- MMÊÊMMEE CCAARRAACCTTÉÉRRIISSTTIIQQUUEESS OONN
EEVVEERRYY CCAANNAALL

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JJEEDDEEMM KKAANNAALL

INTRODUCTION:

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FEATURES:

CONNECTIONS:

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Congratulations on your purchase of Gemini MM-1800/2400 19” 4 channel
stereo mixer. This-state-of-the-art mixer features the latest technological
advances and is backed by a 1 year warranty, excluding the cross fader.
The cross fader is backed by a separate 90 day warranty.
Prior to use we suggest that you carefully read all the instructions.

MM-1800/2400

- 5U, 19" rack mounted mixer

- 4 stereo channels

- 7 lines, 3 Mic, 2 phono/line convertible RCA inputs

- Master, record, booth, & zone RCA outputs

- 1/4" balanced master output

- 2 x 1/4" Mic inputs

- Dual 10 band graphic EQ with on/off switch & LED indicator

- Rotary zone, booth, & cue volume controls

- Assignable cross fader

- Push button cue section per channel with LED indicator

- CUE/PGM fader control allowing cue mix

- XLR-1/4" combo Mic input

- 2 band rotary Mic EQ & volume controls

- Talk over feature

- BNC lamp port

MM-2400

- 6 digital samples with volume, & speed rotary controls

- Master/Mic assignable echo effect switch with repeat & delay controls

VOLTAGE SELECTOR
Before plugging the power cord in, make sure that the VOLTAGE
SELECTOR switch is set to the correct voltage.

POWER CORD

Located on the rear panel is the 115 V/230 V PLUG. Before
plugging the power cord in, make sure the POWER SWITCH
located on the face panel is turned OFF.

The MASTER RCA OUTPUT
connects the mixer to your main amplifier using standard audio
cables with RCA-type connectors.

The RECORD RCA OUTPUT
The RECORD output jacks can be used to connect the mixer to the
record input of your recording unit, thus enabling you to record your
mix with RCA cables.

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ZONE OUTPUT

The ZONE output jacks allow the connection of an additional
amplifier with RCA cables.

BALANCED MASTER

Alternatively, the BALANCED MASTER output jacks also connects
the mixer to the main amplifier using standard cables with 1/4"
TRS connectors. We recommend using balanced cables if the dis­tance to your amp is 10 feet or more.

BOOTH OUTPUT

The BOOTH output jacks allow the connection of an additional
amplifier with RCA cables.

GROUND LIFT SWITCH

The GROUND LIFT SWITCH is used to reduce background noise &
hum when using multiple outlets to power audio equipment. The
switch should be in the position that provides the least amount of
noise or hum. If noise remains at the same level in both positions,
the GROUND LIFT SWITCH should be kept in the GND position

NOTE: MAKE SURE THE MIXER AND/OR AMPLIFIER IS OFF BEFORE SWITCHING THE GROUND LIFT
SWITCH TO PREVENT A TRANSIENT POP THAT MAY DAMAGE YOUR SYSTEM.

PHONO/LINE INPUTS:
Located on the rear panel are 2 PHONO (PH) /LINE (LN) convertible
RCA inputs, & 5 LINE RCA INPUTS. The convertible RCA inputs for

CH 2 & CH 3 allow PH and LN level equipment to be connected to
the mixer.

GROUNDING SCREW

When using (a) turntable(s), you will need to ground the RCA
cable(s) by screwing in the grounding fork(s) to the GROUNDING
SCREW located on the rear panel of the mixer.

Attach a PHONO (Turntable) ground line to the silver GROUND
THUMB SCREW that is situated at the bottom middle of the rear
panel.

CONVERTER SWITCHES
To adjust the CONVERTER(s), just flip the switch UP to operate
PH 1 or PH 2. Flip the switch DOWN to operate through LN 2 or LN

4. The PH INPUTS only accept turntables with a magnetic cartridge.

When using (a) turntable(s), you will need to ground the RCA
cable(s) by screwing in the grounding fork(s) to the GROUNDING
SCREW located in the back panel of the mixers. This is located in
between the CONVERTER SWITCHES. The stereo LN INPUTS only
accept line level inputs such as a CD, DAT, MP3, etc.

MIC (MICROPHONE) INPUT

: CONNECTING A LINE LEVEL D

The MIC 1 input (located on the face panel) is a combination XLR &
1/4” connector. The MIC 2 & MIC 3 inputs (in the rear panel) accept
only 1/4" connectors. The mic inputs accept balanced & unbalanced
connections..

HEADPHONE OUTPUT

The HEADPHONE OUTPUT located at the front bottom right hand
corner of the MM-1800/2400 will accept any headphone with a
standard 1/4” connector and or adapter and will allow you to CUE
your music program before you play it, you can adjust the volume
and PGM mix of the HEADPHONE (see CONTROLS).

Then when all of your connections have been made turn on the
mixer by pressing the POWER SWITCH.

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PRECAUTIONS:

1. All instructions should be read before using this equipment.

2. To reduce the risk of electrical shock, do not open the unit. Please refer
all servicing needs to a Gemini-qualified service technician.

3. Do not expose this unit to direct sunlight or a heat source such as a ra­diator or stove.

4. This unit should be cleaned only with a damp cloth. Avoid solvents or
other cleaning detergents.

5. When moving this equipment it should be placed in its original carton
and packaging. This will reduce the risk of damage during transit.

6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.

7. DO NOT USE SPRAY CLEANERS OR LUBRICANTS ON CON­TROLS, SURFACES OR SWITCHES.

MM-1800/2400

IN THE USA ~ IF YOU EXPERIENCE PROBLEMS WITH THIS UNIT CALL GEMINI CUSTOMER SERVICE AT:

1 [phone]. DO NOT ATTEMPT TO RETURN THIS EQUIPMENT TO YOUR DEALER.

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CONTROLS:

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MICROPHONE VOLUME

Plug your main MIC into the MIC 1 combination
XLR-1/4" input located on the face panel. The rotary controls for. The
rotary MIC 1 VOLUME CONTROL, above the rotary MIC 2 VOLUME
CONTROL, adjusts the decibel level of MIC 1. You may also plug a
second & third MIC into the rear panel's MIC 2 & MIC 3 1/4" jacks.
The decibel level of MIC 2 is controlled by the rotary MIC 2 VOLUME

CONTROL. The decibel level of MIC 3 is controlled by the CH 1
SLIDE CONTROL.

MICROPHONE EQ and TALKOVER SWITCH

The MICROPHONE EQ Let’s you to control the low frequency and
the high frequency of the microphone signal. The TALKOVER switch
allows you to quickly attenuate the main output so the microphone
can be heard over the main music program.

EQUALIZER (EQ)

These units feature dual 10 BAND GRAPHIC EQUALIZER that will
allow you to adjust the sound to fit any room. By adjusting any of the
10 EQ SLIDE CONTROLS, you can cut or boost the tonal characteris­tics of the sound coming from PGM to the speaker(s) by ±12 dB.

EQ SWITCH

To activate the dual 10 BAND GRAPHIC EQ, switch the EQ SWITCH
to ON, & the EQ LED will light up to indicate that the EQ has been
engaged. To deactivate the dual 10 band graphic EQ, switch the EQ
SWITCH to OFF, & the EQ LED will turn OFF. When activated, the
EQ controls the LEFT and RIGHT side of your stereo speakers. The
PGM & EQ are controlled by the MASTER VOLUME. To balance the
sound of the PGM playing through the MASTER VOLUME on the
LEFT & RIGHT side of your speakers you must mirror the EQ levels
on the LEFT & RIGHT EQ controls.

MIXER CHANNEL
(NOTE: ALL 4 CHANNELS HAVE THE SAME FEATURES)

CHANNEL INPUT SELECTOR

The CHANNEL INPUT SELECTOR switches allow you to choose
which input will be controlled by that channels corresponding
volume FADER.

For example on CHANNEL (1) the INPUT SELECTOR allows you to
choose between LINE 1 and MIC 3 , on CHANNEL (2) the

INPUT SELECTOR SWITCH will let you choose between PHONO
1/LINE 2 and LINE 3 and on CHANNEL (3) you can choose between
PHONO 2/LINE 4 and the LINE 5 input, and on CHANNEL (4) you
can choose between LINE 6 and LINE 7.

CHANNEL CUE SELECTOR SWITCH

The CHANNEL CUE SELECTOR SWITCH allows you to choose
which channel you wish to monitor in your headphones by pressing
this switch on any channel you will be able to listen to that channels
input in your headphones multiple CHANNEL SWITCHES can be
pressed to monitor more than on input at a a time.

CHANNEL VOLUME FADER
After you have chosen which input you will use with the INPUT
SELECTOR the corresponding CHANNEL FADER will allow you to
adjust the volume for that particular CHANNEL.

CROSSFADER ASSIGNMENT

The fader assignment rotary allows you to assign which two of the 4
channels will be controlled by the CROSSFADER.There are 5
selections for either side of the CROSSFADER which can be either
CHANNEL 1,2,3,4 or OFF, In the OFF position the CROSSFADER
will not affect the volume of any CHANNEL.

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MM-1800/2400

CROSS FADER

The CROSS FADER allows you to mix evenly from one source to an­other. On the MM-1800/2400 The CROSSFADER is assignable be-
tween either channels (1) and (2) or channels (3) and (4) depending
on the position of the fader assignment push button (see above).
The CROSS FADER on the MM-1800/2400 is also removable and if
the need arises can be replaced.The RG-45 (RAILGLIDE™)
DUAL-RAIL CROSS FADER, which has internal dual stainless steel
rails that allow the slider to ride smoothly and accurately from end to
end can be purchased from your local GEMINI dealer.

NOTE: FOR OPTIMAL PERFORMANCE IN YOUR SOUND OUTPUT, HAVE YOUR SOUND
SET TO STEREO NOT MONO. START WITH THE EQ LEVELS AT CENTER VALUE. THE EQ SLIDE CON­TROLS SHOULD LOCK AT THIS POSITION. ADJUST YOUR MASTER VOLUME CONTROL FROM MID TO
LOW VOLUME RANGE. THEN ADJUST THE LEFT OR RIGHT EQ, ONE SLIDE CONTROL AT A TIME, TO A
COMFORT ABLE LEVEL. ONCE YOU ARE SATISFIED WITH THE SOUND OF ONE SIDE, MATCH THE EQ
SETTINGS ON THE OTHER SIDE. ONCE YOU HAVE PASSED THE CENTER VALUE ON THE EQ, THE
MASTER OUTPUT, AS INDICATED IN THE VU METER MAY EXPERIENCE A TONAL BOOST. PLEASE AD­JUST THE MASTER VOLUME TO A COMFORTABLE LEVEL SO YOU DO NOT OVERLOAD YOUR SYS­TEM. CLIPPING WILL OCCUR WHEN YOU ARE OVERLOADING YOUR SYSTEM. LOWER THE MASTER
VOLUME OR ADJUST YOUR EQ SETTINGS SO THAT CLIPPING DOES NOT OCCUR. THEN YOU MAY

RAISE THE MASTER VOLUME TO A LEVEL WITH WHICH YOU ARE COMFORTABLE.

STEREO/MONO SWITCH

You can convert your sound output from STEREO to MONO & vice
versa by using the STEREO/MONO SWITCH. Switch to the LEFT to
convert to STEREO. Switch RIGHT to convert to MONO.

ZONE VOLUME ROTARY
Controls the volume level of the ZONE OUTPUT.

BOOTH VOLUME ROTARY
Controls the volume level of the BOOTH OUTPUT.

MASTER VOLUME CONTROL

Once you are comfortable with the sound level of your music you
may adjust the decibel level of the PGM with the MASTER VOLUME
CONTROL. MASTER RCA & BALANCED MASTER OUTPUTS are
controlled by the level of the MASTER VOLUME control.

BNC LAMP PORT

The BNC LAMP PORT connects a 12 V BNC goose neck lamp, such
as the Gemini GNL-700 to the mixer.The goose neck lamp will be
powered by your mixer. To turn ON the goose neck lamp, you must
first attach the goose neck lamp to the BNC LAMP PORT. Make sure
the mixer is OFF when connecting the 12 V BNC lamp. To connect
the goose neck lamp, simply align the screw cap of the goose neck
lamp to the locking nodules of the BNC LAMP PORT, push down, &
twist the screw cap clockwise to lock the 12 V BNC goose neck lamp
in place. Then turn ON your mixer. The goose neck lamp should
light-up. To detach the goose neck lamp from the BNC LAMP PORT,
first make sure your mixer is OFF. Turn OFF your mixer and the
goose neck lamp will turn OFF. Unscrew the screw cap by twisting it
counterclockwise, then pull up & remove the goose neck lamp.

VU METER
The VU METER indicates the decibel level of the MASTER RCA &
MASTER BALANCED outputs of the LEFT & RIGHT stereo levels.

CUE/PGM FADER
The CUE/PGM FADER determines the mix between the chosen
CHANNEL CUE SELECTION and the MAIN OUTPUT mix.
To the left is the CUE program and to the right is MAIN OUTPUT.

CUE VOLUME ROTARY KNOB
The CUE VOLUME ROTARY KNOB adjusts your HEADPHONE
MONITOR OUTPUT volume.

POWER SWITCH

Once all of your connections have been made in the rear panel,
turn ON the mixer by pressing the POWER SWITCH. Once turned
ON, the POWER BAR LED, containing the power symbol located in
the VU METER, will be illuminated. Turn OFF the mixer when not in
use by pressing the POWER SWITCH to OFF. When the mixer is
turned OFF the POWER BAR LED will not be illuminated.

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FADER REPLACEMENT:

SPECIFICATIONS:

1. UNSCREW THE FADER (B) SCREWS. DO NOT TOUCH INSIDE
SCREWS (C) CAREFULLY REMOVE OLD CROSS FADER AND UNPLUG
CABLE (D)

2. PLUG IN THE NEW CROSS
FADER INTO CABLE (D) AND
PLACE BACK INTO MIXER.

3. SCREW THE CROSS FADER TO
MIXER WITH THE FADER PLATE
SCREWS (B)

4. REPLACE THE FACE OF THE
MIXER AND SCREW THE FOUR

SCREWS BACK IN AND REPLACE THE FADER KNOBS.

INPUTS:

Phono:..........................................................................3 mV, 47 KOhm

Line:.........................................................................150 mV, 27 KOhm

MIC 1, 2, & 3:.............................................1.5 mV, 2 K Ohm Balanced

Bass:..........................................................................................± 12dB

High:...........................................................................................± 12dB

OUTPUTS:

Amp/Booth:.............................................................0 dB 1 V, 400 Ohm

Max:........................................................................20 V Peak-to-Peak

Rec.............................................................................150 mV, 5 KOhm

Zone........................................................................0 dB 1 V 400 Ohm

Balanced..................................................................6 dB 2 V 400 Ohm

GENERAL:

Frequency Response:.....................................20 Hz - 20 KHz +/- 2 dB

Distortion:....................................................................................0.02%

S/N Ratio:.................................................................Better Than 80 dB

Talkover Attenuation:..................................................................-16 dB

Headphone Impedance:...........................................................16 Ohm

Power Source:............................................115/230 V, 60/50 Hz, 20 W

Unit Dimensions:.................................................W 19" x H 4" x D 9.1"

..................................................................(482.6 x 100.6 x 231.2 mm)

Weight:..................................................................... 10.34 lbs (4.7 kg)

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTIFICATION

FOR IMPROVEMENT

MM-1800/2400

(MM-2400) CONTROLS:

ECHO SECTION:

An echo effect may be applied to the PGM, or MIC 1 & MIC 2
signals by switching the ECHO ASSIGN switch from MIC 1-2 on the
LEFT, to OFF in the MIDDLE, to MASTER on the RIGHT & vice
versa. When using ECHO, you may adjust the effect of the ECHO by
using the rotary REPEAT, DELAY, and ECHO VOLUME controls.
To turn the ECHO ASSIGN OFF or lower the ECHO VOLUME.

SOUND EFFECTS SECTION:
Six different sound effects (APPLAUSE, SCREAM, COPTER,
SCRATCH, H2O & GLASS) may be added to your mix by pressing

the SOUND EFFECTS CONTROL BUTTONS. The volume of the
effects can be adjusted using the rotary EFX VOLUME located
above the APPLAUSE effect button. The pitch of the effects can be
increased or decreased using the rotary SPEED CONTROL located
above the SCRATCH effect button.

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