Gemini PDM-12 User Manual

OPERATIONS MANUAL

Bedienungsanleltung
Manual de funcionamiento
Manual de fonctionnement
Manual del utente

PDM-12

PROFESSIONAL STEREO PREAMP MIXER

Professionneller Stereo Vorverstärkermischpult
Mezclador-preamplificador estereofónico para el profesional
Mélangeur-préamplificateur stéréophonique pour le professionnel
Miscelatore-preamplificatore stereofonico per il professionale

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10

7

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2

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12

9

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4

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Introduction

Congratulations on purchasing the Gemini PDM-12 mixer. This state of
the art mixer is backed by a three year warranty, excluding crossfader
and channel slides. Prior to use, we suggest that you carefully read all
the instructions.

Features

• 4 Stereo Channels

• State of the Art Cue Section

• 3 Phono/Line Convertible, 5 Line, and 2 Mic Inputs

• Gain controls for each channel

• Talkover with Auto Mute

• Stereo 7 Band Graphic Equalizer

• Balanced and Unbalanced Master Outputs

• Booth and Record outputs

Cautions

1. All operating instructions should be read 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 refer servicing to
a qualified service technician.

In the U.S.A., if you have any problems with this unit,

call 1-732-969-9000 for customer service. Do not retur n

equipment to your dealer.

3. Do not expose this unit to direct sunlight or to 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 ANY SPRAY CLEANER OR LUBRICANT ON ANY
CONTROLS OR SWITCHES.

Connections

1. Before plugging in the power cord, make sure that the VOLTAGE
SELECTOR (36) switch is set to the correct voltage.

NOTE: This product is double insulated and not intended

to be grounded.

2. Make sure that the POWER (31) switch is in the off position. The
POWER LED (32) will be off.

3. The PDM-12 is supplied with 4 sets of amp output jacks. The
BALANCED OUTPUT (37) jacks are used to connect to your main
amplifier using standard XLR cables. We recommend using the
balanced amp outputs if the cables to your amp are 25 feet or more.
BALANCED OUTPUTS have three separate conductors, two of
which are signal (positive and negative) and one shield (ground). Pin
1 is ground (shield). Pin 2 is signal hot (positive). Pin 3 is signal cold
(negative). The MAIN OUTPUT (38) jacks are unbalanced and used
to connect to your main amplifier. The REC OUTPUT (40) jacks can
be used to connect the mixer to the record input of your recorder
enabling you to record your mix. The BOOTH OUTPUT (39) jacks
allow you to hook up an additional amplifier.

4. The MIC 1 (1) input (found on the front panel) accepts a 1/4" or XLR
connector. The MIC 2 (52) input (found on the rear panel) accepts
1/4" connectors. All accept balanced and unbalanced microphones.

5. On the rear panel are 3 stereo PHONO/LINE (44, 47, 50) inputs and
5 stereo LINE (41, 42, 43, 46, 49) inputs. The PHONO/LINE

SWITCH (45) enables you to set the (44) input to Phono or Line. The
PHONO/LINE SWITCH (48) enables you to set the (47) input to

Phono or Line. The PHONO/LINE SWITCH (51) enables you to set
the (50) input to Phono or Line. The phono inputs will accept only
turntables with a magnetic cartridge. A GROUND SCREW (53) for
you to ground your turntables is located on the rear panel. The stereo
line inputs will accept any line level input such as a CD player, a
cassette player, etc.

6. Headphones can be plugged into the front panel mounted
HEADPHONE (35) jack.

7. The PDM-12 comes with a front panel BNC LIGHT (30) jack. This
jack is for use with a gooseneck light like the Gemini GNL-700.

Using the 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 mixer on, listen to the system in idle mode (no signal
present) with the ground applied (the GROUND LIFT SWITCH (54) in
the left position).

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

SWITCH (54). Lift the ground by moving the 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 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
MIXER IN ANY WAY. TERMINATION OF THE AC GROUND CAN BE
HAZARDOUS.

Operation

1. POWER ON: Once you have made all the equipment connections to
your mixer, press the POWER SWITCH (31). The power will turn on
and the POWER LED (32) will glow RED.

2. CHANNEL 1: The GAIN (7) control allows you to individually adjust
the gain of the channel. Switch # (8) allows you to select the

PHONO 1/LINE 1 (50) or the LINE 2 (49) input. The CHANNEL
SLIDE (9) controls the input level of this channel.

3. CHANNEL 2: The GAIN (10) control allows you to individually adjust
the gain of the channel. Switch # (11) allows you to select the

PHONO 2/LINE 3 (47) or the LINE 4 (46) input. The CHANNEL
SLIDE (12) controls the input level of this channel.

4. CHANNEL 3: The GAIN (13) control allows you to individually adjust
the gain of the channel. Switch # (14) allows you to select the

PHONO 3/LINE 5 (44) or the LINE 6 (43) input. The CHANNEL
SLIDE (15) controls the input level of this channel.

5. CHANNEL 4: The GAIN (16) control allows you to individually adjust
the gain of the channel. Switch # (17) allows you to select the LINE 7
(42) or the LINE 8 (41) input. The CHANNEL SLIDE (18) controls the
input level of this channel.

6. CROSSFADER SECTION: The CROSSFADER (21) allows the
mixing of one source into another. The PDM-12 features an
assignable crossfader. The ASSIGN (20, 22) switches allow you to
select which channel will play through each side of the crossfader.
The ASSIGN (20) switch has 5 settings (OFF, 1, 2, 3 or 4) and allows
you to select channel 1, 2, 3 or 4 to play through the left side of the

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crossfader. The ASSIGN (22) switch has 5 settings (OFF, 1, 2, 3 or

4) and allows you to select channel 1, 2, 3 or 4 to play through the
right side of the crossfader. With the ASSIGN switch in the off
position, that side of the crossfader will be inactive. The
CROSSFADER (21) in your unit is removable and if the need arises
can be easily replaced. Crossfader units are available in three
varieties. Part # RF-45 (which is identical to the crossfader supplied
with the mixer) has a 45 mm travel from side to side. Part # RF-30 is
available with a 30 mm travel distance. Also available is the PSF-45
with a special curve designed for scratch mixing. Just purchase one
of these crossfader units from your Gemini dealer and follow these
instructions:

1. Unscrew the outside FADER PLATE SCREWS (B). Do
not touch the INSIDE SCREWS (C).

2. Carefully lift the fader and unplug the CABLE (D).

3. Plug the new fader into the cable and place it back in the
mixer.

4. Screw the fader to the mixer.

7. EQUALIZER SECTION: This unit features a stereo 7 band GRAPHIC
EQUALIZER (25) to allow you to adjust the sound for any room. To
activate the equalizer, press the EQ BUTTON (24) (the EQ LED will
light). By adjusting any of the equalizer slide controls, you can cut or
boost the tonal characteristics of the sound by ±12 dB. Deactivate
the equalizer by pressing the EQ BUTTON (24) again (the EQ LED
will turn off).

8. OUTPUT CONTROL SECTION: The level of the AMP OUT (37, 38)
is controlled by the MASTER (29) slide and the BALANCE
CONTROL (28). Activating the MONO (27) button (the mono LED
will light) makes the overall output mono. The BOOTH (33) control
adjusts the level of the BOOTH OUTPUT (39). HINT: The booth
output is used by some DJs to run monitor speakers in their DJ
booth. You can also use it as a second ZONE or AMP output.

NOTE: The RECORD OUT (40) has no level control. The

level is set by the channel slides and the gain controls of

the selected channel. The tonal qualities are set by the

equalizer.

9. TALKOVER SECTION: The purpose of the talkover section is to
allow the program playing to be muted so that the mic can be heard
above the music. The MIC/TALKOVER SWITCH (6) controls MIC 1
and MIC 2 and has three settings. When the MIC/TALKOVER
SWITCH (6) is in the bottom position (AUTO MUTE), the volume of
all sources except the Mic inputs are lowered by 16 dB when you
speak into the mic. The volume returns to normal levels when you
stop speaking. When the MIC/TALKOVER SWITCH (6) is in the
center position (OFF), MIC 1 and MIC 2 and talkover will be off.
When the MIC/TALKOVER SWITCH (6) is in the top position, MIC 1
and MIC 2 and talkover will be on constantly and the volume of all
sources except the Mic inputs are lowered by 16 dB. The TREBLE
(2) and BASS (3) controls allow you to fully adjust the tone of MIC 1
and MIC 2. MIC LEVEL (5) controls the level of MIC 1. MIC LEVEL
(4) controls the level of MIC 2.

10.CUE SECTION: By connecting a set of headphones to the
HEADPHONE (35) jack, you can monitor any or all of the channels.
Press the CUE ASSIGN (19) buttons for channels 1 - 4 to select the
channel or channels to be monitored and their respective LED
indicators will glow. Use the CUE LEVEL (34) control to adjust the

cue volume without effecting the overall mix. By moving the CUE
PGM PAN (26) control to the left you will be able to monitor the
assigned cue signal. Moving the control to the right will monitor the
PGM (program) output.

11. DISPLAY: The DISPLAY (23) indicates the MASTER output left and
right levels.

Specifications

INPUTS:

DJ Mic....................................................1.5mV 2Kohm balanced

Phono.........................................................................3mV 47Kohm

Line.......................................................................150 mV 27Kohm

OUTPUTS:

Amp/Booth......................................................0 dB 1V 400ohm

Max..............................20V Peak to Peak

Rec...........................................................................225mV 5Kohm

MIC 1 & MIC 2:

DJ Mic....................................................1.5mV 2Kohm balanced

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

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

GENERAL:

Gain (Chnls 1-4)..............................................................0 to -20dB

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

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

S/N Ratio...............................................................better than 80dB

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

Headphone Impedance.........................................................16ohm

Power Source.............................................115/230V 50/60Hz 10W

Dimensions...............................19”w x 4”d x 9”h (483 x 94 x 221 mm)

Weight........................................................................10.2 lbs (4.6 kg)

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In the U.S.A., if you have any problems with this

unit, call 1-732-969-9000 for customer service. Do

not return equipment to your dealer.

Parts of the design of this product may be protected by worldwide patents.
Information in this manual is subject to change without notice and does not represent a commitment on the

part of the vendor. Gemini Sound Products Corp. shall not be liable for any loss or damage whatsoever arising
from the use of information or any error contained in this manual.

No part of this manual may be reproduced, stored in a retrieval system or transmitted, in any form or by any
means, electronic, electrical, mechanical, optical, chemical, including photocopying and recording, for any
purpose without the express written permission of Gemini Sound Products Corp..

It is recommended that all maintenance and service on the product should be carried out by Gemini Sound
Products Corp. or it’s authorized agents. Gemini Sound Products Corp. cannot accept any liability whatsoever

for any loss or damage caused by service, maintenance or repair by unauthorized personnel.

Worldwide Headquarters • 8 Germak Drive, Carteret, NJ 07008 • USA

T el [phone] • Fax [phone]

France • G.S.L. France • 1 1, Avenue Leon Harmel, Z.I. Antony , 92160 Antony , France

T el 01 1-331-5559-0470 • Fax [phone]

Germany • Gemini Sound Products GmbH • Ottostrasse 6, 85757 Karlsfeld, Germany

T el: 08131 - 39171-0 • Fax: 08131 - 39171-9

UK • Gemini Sound Products • Unit C4 Hazleton Industrial Estate, Waterlooville, UK P08 9JU

T el: 01 1-44-170-5591-771 • Fax: [phone]

Spain • Gemini Sound Products S.A. • Mino, 1 12, Nave 1, 08223 Terrassa, Barcelona, Spain

T el: 01 1-34-93-736-34-00 • Fax: [phone]

© Gemini Sound Products Corp. 1999 All Rights Reserved