Page 1
SERVICE MANUAL
XTR-400
ACTIVE SPEAKER SYSTEM
SUBWOOFER / SATELLITES
CONTENT’S:
Cautions, Connections, & Operations :....................................Page 2-4
Specifications:..............................................................................Page 4
Parts Lists:....................................................................................Page 5
PCBs:..........................................................................................Page 6-8
Schematics....................................................................................Page 9
Gemini Sound Products Corp.
120 Clover Place P.O. Box 6928
Edison, NJ 08818-6928
732-738-9003 (Phone) • 732-738-9006 (Fax)
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INTRODUCTION:
Congratulations on your purchase of an XTR-400 speaker system
engineered & manufactured by Gemini Sound Products. This state of the
art speaker system is backed up by a three-year warranty. The XTR-400
offers ultimate fidelity , power handling, and an array of features that makes
it a highly versatile, compact, self contained & powered speaker system.
OUTPUT SECTION:
Disconnect unit from the AC power source before making any connections.
SPEAKER OUTPUTS (3): The speaker output connectors are Speakon™
connectors that will accept cables with Speakon™ connectors. (These
cables must be purchased separately) The subwoofer is already connected
internally, so you don’t have to worry about connecting it to the amplifier.
FEATURES:
• Active self-powered 400W rms tri-amp design.
• One 15-inch bandpass subwoofer. Features top-hat hardware for pole mounting of a
satellite speaker and metal corner protectors.
• Two high quality satellite speakers featuring 10-inch woofers and dual piezo horns housed in
trapezoidal cabinets. Satellite speakers are uniquely designed for placement on stands or for use
as floor monitors, and protected by full front metal grill and metal corners.
• Built-in active optimized crossovers.
• Sensitivity/Volume controls.
• Satellites equipped with reliable Speakon™ connectors for exceptional sound.
(cables must be purchased separately)
• Signal Ground Lift Switch for achieving the quietest possible hum-free operation.
• Airflow controlled by variable speed fan for maximum cooling and quietest possible operation.
• Mono or Stereo operation.
• AC line voltage selector switch allows reconfiguring amplifier for either 110-120V or 220240V AC lines.
• Compact design featuring large metal handles and casters for ease in transporting.
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 Gemini Sound Products service technician.
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.
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 SPRA Y CLEANER OR LUBRICANT ON ANY
CONTROLS OR SWITCHES.
CONNECTIONS:
INPUT SECTION:
There are two parallel input connectors (one female XLR and one 1/4” jack) per
channel. Either can be used as an input or as a link to chain amplifiers.
AC POWER SECTION:
POWER SWITCH (8): turns the unit on and off.
POWER LED (9): the power LED lights when the power is on.
FUSE (4): replace with proper type and rating.
AC INLET (6) is used to attach the power cord to the unit.
AC LINE VOLTAGE SELECTOR SWITCH (5) allows reconfiguring
amplifier for either 110-120V or 220-240V AC lines.
OPERATION:
STEREO OPERATION:
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 8W speakers of matched power ratings. We suggest only
using the speakers that come with the unit.
1. With the power OFF, connect your input cables from your music source
(such as your mixer) to the Channel 1 and Channel 2 INPUTS using the
XLR INPUT JACKS (1) or 1/4" PHONO INPUT JACKS (2).
2. Connect your speakers to the Channel 1 and Channel 2 SPEAKER
OUTPUTS (3).
3. With the SENSITIVITY/VOLUME CONTROLS (10) of both channels
set to zero (fully counter clockwise), turn the POWER SWITCH (8), 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. Now play some
music and listen for audible distortion. If you do hear distortion decrease
the output level using the SENSITIVITY/VOLUME CONTROLS (10).
MONO OPERATION:
Connect your MONO signal to the Channel 1 input (1 or 2). Now create a
link by connecting the remaining Channel 1 input to a Channel 2 input
(1 or 2) using a standard balanced cable (may be purchased separately).
You can adjust the level of each satellite speaker using it’s channel’s
SENSITIVITY/VOLUME CONTROL (10).
XLR INPUT JACKS: XLR INPUT JACKS (1) electronically balanced
inputs accept a standard XLR male connector. Pin 1 = shield/ground, pin
2 = hot or positive (+) and pin 3 = cold or negative (-).
1/4" PHONO INPUT JACKS: 1/4" PHONO INPUT JACKS (2) accept a
balanced as well as an unbalanced line. The unbalanced line uses a
standard tip-sleeve connection. The tip is positive and the sleeve is
negative/ground. The balanced line uses a tip-ring-sleeve connection.
Tip = hot or positive (+), ring = cold or negative (-), and sleeve = shield/ground.
SENSITIVITY/VOLUME CONTROLS: SENSITIVITY/VOLUME CONTROLS
(10) control the input levels for each channel of the 2 satellite speakers.
The volume level of the subwoofer is controlled automatically to match the
volume levels of the satellite speakers. It will always maintain a perfect
balance to give you incredible sound quality!
SIGNAL GROUND LIFT SWITCH: SIGNAL GROUND LIFT SWITCH (7)
is used to lift the balanced input connectors’ ground/shield from the
amplifier’s ground. When the signal ground lifted, the sound source
disconnects from the amplifier’s ground preventing ground loops which
can generate hum and noise. See the Signal Ground Lift Switch
Instructions for more detail.
USING THE SIGNAL 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 SIGNAL GROUND LIFT SWITCH (7) will
be in the left position.
2. Turn the power OFF before moving the SIGNAL GROUND LIFT SWITCH (7).
Now lift the ground by moving the SIGNAL GROUND LIFT SWITCH (7)
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!!
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SETUP:
There are various ways to set up this system:
BASIC SETUP:
Okay, this is your basic setup, perfect for small parties and venues. The
ideal location for your subwoofer is close to a wall or in a corner. This
will give you the fullest bass response. Your 2 satellite speakers can be
placed up on stands on each side (stands must be purchased separately).
TWO-SYSTEM SETUP:
This setup is perfect for larger venues. This setup requires 2 XTR-400
systems. This will give you a total of 800 watts rms! Place a subwoofer
on each side to the left and right. Using the high-hat hardware and
connecting pole (which can be purchased separately), place the
pole in the high-hat socket on the subwoofer, and a satellite speaker on
top of the pole. The 2 remaining satellite speakers may be used as either
floor monitors, or placed on stands elsewhere in the room giving you a
louder and fuller sound.
Each speaker system in this setup must be used in MONO mode (see
Mono section). Connect the system that is on the left side of the audience
to the LEFT channel of your mixer, and the system that is on the right side
of the audience to the RIGHT channel of your mixer.
ACTIVE SPEAKER SYSTEM SUBWOOFER/SA TELLITES
The XTR-400 features a unique design for ease in transporting. The 2
satellite speakers conveniently fit into a special recessed section of the
subwoofer and are securely fastened using a strap that attaches to the
handles (included).
SPECIFICATIONS:
Subwoofer XTR-400SUB:
Amplifier’s Output Power:.........................230 Wrms on subwoofer channel
Frequency response:……………………...........................….32 Hz - 100 Hz
Components:………………………...........................……………..15" woofer
Features:
Efficient band-pass cabinet design
Large metal handles
Metal protection corners
Four 2" wheels
Amplifier assembly on the back
35mm standmount cap on top
Black carpet finish
Rubber feet
Dimensions:..............................................................WxDxH: 20"x31"x24.5"
(508 x 788 x 622 mm)
Weight:…………………............................……………………..96 lbs (44 kg)
Satellites GT-1002s:
Amplifier’s Output Power:..........................2x85 Wrms on satellite channels
Frequency response:…………............................………….100 Hz – 20 kHz
Components:….…………...........................……………………….10" woofer
6” dual piezo horn
Features:
Trapezoidal cabinet
Full front protective metal grill
Metal protection corners
35 mm standmount cup on the bottom
Black carpet finish
Rubber feet
Neutrik Speakon connector
Dimensions:……….……..............................…….W x D x H 12.5" x 9" x 18"
(318 x 229 x 458 mm)
Weight:……………………...........................………………18 lbs (8 kg) each
Total System:
Maximum SPL, continuous:……...........................……………………120 dB
Sensitivity………………………...........................……………………. 1 Vrms
Input Impedance………...............10 kOhm unbalanced/20 kOhm balanced
Features:
Balanced XLR and 1/4" Jack inputs
Neutrik Speakons on Satellite Channels’ outputs
Active electronic X-over (Fx=100 Hz)
Variable speed fan
Individual channel Sensitivity/Volume controls
Signal Ground lift switch
110-120 VAC / 220-240 VAC switchable
SHOULD YOU EXPERIENCE ANY DIFFICULTIES OR PROBLEMS,
PLEASE CALL: 1 (732) 738-9003 FOR GEMINI CUSTOMER SERVICE.
Total Weight:……………............…...............………………...132 lbs (60 kg)
SPECIFICATIONS AND DESIGN ARE SUBJECT T O CHANGE WITHOUT
NOTICE FOR PURPOSE OF IMPROVEMENT.
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Page 5
PARTS LIST:
Item # Designators Description Part Number
MAIN PCB:
1 ZD3, ZD2 ZENER DIODE 1/2W 12V (RD12EB2) 079-012
2 D3, D1, D2 SILICON DIODE 1N4148 079-003
3 ZD1 ZENER DIODE 1/2W 24V (RD24EB2) 079-020
4 Q1 SILICON TRANSISTORS 2SC1815 076-003
5 Q2 SILICON TRANSISTOR 2SC4793 076-100
6 C18, C13 ELECTROLYTIC CAPACITORS 6800
7 REC1 BRIDGE RECTIFIER KBPC804W 086-019
8 U3, U2, U4, U1 INTEGRATED CIRCUIT TDA7294V 074-189
CROSSOVER PCB:
1 VR1, VR2 ROTARY VR 10KA L:15MM 071-228
2 LD1 LED (GREEN) 5
3 IC1, IC3, IC2 INTEGRA TED CIRCUIT NJM4558DD (BA15218,M5218AP) 074-163
1 SW1 SLIDE SWITCH SV70050 081-030
2 IC1 INTEGRATED CIRCUIT NJM4558DD (BA15218,M5218AP) 074-163
3 X3, X2 PHONE JACK 6.3
4 XLR2, XLR1 XLR XLF-3PH 092-069
φφ
φ 080-086
φφ
INPUT PCB:
φφ
φTRS 1/4" BAL 092-078
φφ
µµ
µ/50V 050-198
µµ
OUTPUT PCB:
1 X1, X2 SPEAKON™ CONNECTORS NL4MP 092-149
OTHER:
1 AC CORD 093-369
2 AC INLET 092-105
3 DC FAN 24V 001-613
4 TRANSFORMER 059-247
5 SLIDE SWITCH 081-023
6 POWER SWITCH 083-121
7 FUSE VBS UTE 3.15A 250V 100-068
8 FUSE VBS UTE 6.3A 250V 100-071
In the USA: If you should 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.
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Page 6
INPUT PCB
C1
R5
XLR1
R1
SW1
R3
X1
R2
R6
C3
C2
R4
R7
R9
X2
X3
C5
R8
IC1
C4
OUTPUT PCB
++
XTR400-3
XLR2
G
XTR400-4
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Page 7
TOP LAYER X-OVERMAIN PCB
XTR400-2
R14
D2
C12
C14
X13
BLK
U1
U2
XTR400-1
J1
C15
R16
R17
R18
J2
C13
R15
J3 J4
BLK BLK
X6X5
REC1
R19
R20
C17
C16
J5
RED
X7
AC
+
J8
R21
R22
R23
R24
J6
J7
-
AC
RED
X8
U3
J9
C20
U4
J10
C18
X3
R13
R8
C4
X2
RED
L1
X1
RED
L2
R1
C2
Q1
C3
C1
R4
Q2
R3
R9
R6
R7
R5
ZD1
X4
1
C6
C8
1
C7
R11
15
C5
C9
R12
C10
1
15
R10
C11
R2
D1 D3
C19
C21
R25
C23
R27
C26
L4
15
1
R31
R32
15
1
X9
RED/BLK
C27
R26
R30
C24
C25
R33
C22
BLK
R34
R37
X10
X11
R35
C30
C29
ZD2
ZD3
L3
C28
X12
R36
R28
R29
C32
C31
R38
X2
C14
C13
R22
X3
C11
IC3
X4
R16
R14
R15
J3
IC2
R21
J2
C7
C8
C6
R18
R17
C10
R12
C9
X1
R11
R20
R19
R6
C12
LD1
R1
R7
C5
R3 R4
R2
C1
VR2
VR1
R13
J1
C4C3C2
R10
R9
R8
IC1
R5
Page 8
BOTTOM LAYER X-OVERMAIN PCB
XTR400-2
C19
C21
R25
C23
R27
C26
L4
15
1
R31
R32
15
1
X9
RED/BLK
C27
R26
R30
C24
C25
R33
C22
BLK
R34
R37
X10
X11
R35
C30
C29
ZD2
ZD3
L3
C28
X12
R36
R28
R29
C32
C31
R38
X2
C14
C13
R22
X3
C11
IC3
X4
R16
R14
R15
J3
IC2
R21
J2
C7
C8
C6
R18
R17
C10
R12
C9
X1
R11
R20
R19
R6
C12
LD1
R1
R7
C5
R3 R4
R2
C1
VR2
VR1
R13
J1
C4C3C2
R10
R9
R8
IC1
R5
X3
R13
R8
C4
X2
RED
L1
X1
RED
L2
R1
C2
Q1
C3
C1
R4
Q2
R3
R9
R6
R7
R5
ZD1
X4
1
C6
C8
1
C7
R11
15
C5
C9
R12
C10
1
15
R10
C11
R2
D1 D3
XTR400-1
R14
U1
D2
U2
C12
C14
X13
BLK
R19
R20
C17
J1
R15
C15
R16
R17
R18
J2
J3 J4
C13
BLK BLK
X6X5
REC1
AC
+
J5
RED
X7
C16
-
AC
R21
R22
R23
R24
J8
J6
J7
RED
X8
U3
J9
C20
U4
J10
C18
Page 9
SCHEMATIC
X2
7
+ 12V
6
10uF25V NP
5
CH.1 (L) INPUT
4
10uF25V NP
3
CH.2 (R) INPUT
2
1
- 12V
CH.1 (L)
INPUT
2 1
X3
TRS 1/4" BAL
SW1
"Signal ground lift"
2 1
X2
TRS 1/4" BAL
CH.2 (R)
INPUT
X-OVER PCB
C7
C6
3
XLR2
XLF-3PH
T
R
S
3
XLR1
XLF-3PH
T
R
S
VR1
10KA
CH.2 (R)
VOLUME
CONTROL
R3 10K 1%
R4 10K 1%
C1
143
2 5
R6 10K 1%
R1 10K 1%
VR2
10KA
CH.1 (L)
VOLUME
CONTROL
INPUT PCB
R5 510
0.047uF
60.4K 1%
60.4K 1%
6
C3
270
R9
R11
13K 1%
22.1K 1%
+ 12V
2
C4
C3
.047uF5%
.047uF5%
39.2K 1%
R12
R18
10K 1%
+ 12V
2
3
IC3A
R13
NJM4558DD
4 8
C2
C12
.047uF 5%
.047uF 5%
C4 270
R9 10K 1%
6
5
IC1B
NJM4558DD
R7
10K 1%
C2
270
C5 270
R8 10K 1%
+ 12V
2
3
IC1A
NJM4558DD
4 8
- 12V
R2
10K 1%
R8
1
R20
22.1K 1%
7
1
3
NJM4558DD
4 8
- 12V
R10
39.2K 1%
C8
.1uF 5%C5.1uF 5%
R6
13K 1%
6
5
NJM4558DD
R19
39.2K 1%
R5
39.2K 1%
+ 12V
- 12V
IC1A
39.2K 1%
IC1B
10K 1%
7
6
5
4
3
2
1
1
R22
13K 1%
R2 13K 1%
R3
39.2K 1%
CH.1 (L) OUTPUT
CH.2 (R) OUTPUT
R4
R21 13K 1%
39.2K 1%
FUSE
6.3A / 110-120V
3.15A / 220-240V
L
N
AC INLET
E
6
5
C11
0.033uF5%
F
F
NJM4558DD
C1
0.033uF5%
7
IC2B
+ 12V
100uF16V
- 12V
C14
100uF16V
POWER PCB
P1
R15
R14
13K 1%
+ 12V
2
1
3
IC2A
NJM4558DD
4 8
R1
- 12V- 12V
R7
39.2K 1%
7
X1
7
6
5
4
3
2
1
7
6
5
4
3
2
1
CH.1 (L) OUTPUT
SUB OUTPUT (+)
R17 13K 1%
6
5
CH.2 (R) OUTPUT
SUB OUTPUT (-)
C13
R16
2.4K
LD1
GRN
SW3
SW-POWER
C101
IC3B
NJM4558DD
X4
1
2
3
4
7
X3
1
2
3
4
X1
1
C10
0.1
2
3
C9
0.1
P2
P3
VOLTAGE SELECTOR
X3
X12
X9
T1
BRN
BLU
ORG
SW4
230v115v
BLK
WHT
18AWG BLACK
CH.1 (L) INPUT
1
2
3
SUB INPUT (+)
4
1
CH.2 (R) INPUT
2
3
4
SUB INPUT (-)
1
+12V
2
3
-12V
X6
BLACK
To CENTER TAP
POWER TRANSFORMER
X8
RED
To POWER
TRANSFORMER
X7
RED
To POWER
TRANSFORMER
X13
BLACK
To CHASSIS
X5
BLACK
To SPEAKER
OUTPUTS
MAIN PCB
2
3
1
R9 5.1K
D3
1N4148
R35 5.1K
REC1
KBPS10-02
C10
2200pF
C24
2200pF
C6 10pF
R6
26.7K 1%
R4
1K 1%
C9
22uF25V
R34 5.1K
R23
5.1K
R33 5.1K
R24
8.2K
1K 1%
C25
22uF25V
+E
R29 1.2K 3W
C13
6800uF50V
4
C18
6800uF50V
R28 1.2K 3W
-E
R12 13K 1%
R25
R27 13K 1%
R17
5.1K
C32
22uF25V
10uF25V
2
3
4
10
9
1
R18
5.1K
R22
5.1K
C30
R21
5.1K
2
3
4
10
9
1
+12V
C26
100uF16V
ZD3
12V 0.5W
C31
ZD2
100uF16V
12V 0.5W
-12V
U2
IN -
IN +
IN+MUTE
MUTE
STBY
STBY-GND
C28 10pF
R38
U4
IN -
IN +
IN+MUTE
MUTE
STBY
STBY-GND
TDA7294V
+PWVs
BOOTSTRAP
-PWVs
26.7K 1%K
TDA7294V
+PWVs
BOOTSTRAP
-PWVs
D1 1N4148
+E
C14
0.1
13
7
+Vs
14
OUT
6
8
-Vs
15
-E
13
7
+Vs
14
OUT
6
8
-Vs
15
C11 22uF50V
+E
C21 22uF50V
-E
R2 2.4K
R1 8.2K
R10 8R2 1W
C16
0.1
R36 8R2 1W
T
L2 1.0uH
L3 1.0uH
R7
68
D2
1N4148
SUBWOOFER
OUTPUT (+)
C2
0.1uF100V
SUBWOOFER
OUTPUT (-)
BLACK
C23
0.1uF100V
X1
RED
18AWG RED 45sm
Twisted pair to Subwoofer terminal
18AWG BLACK 45sm
X11
R5
2.4K
Q1
2SC1815
ZD1
C12
24V 0.5W
4.7uF50V
R8 5.1K
R30 5.1K
R14
1K 1%
R13 13K 1%
C4
390pF
C8
10uF25V
R15
5.1K
R20
5.1K
Ends
striped
15mm
R32
1K 1%
R31 13K 1%
C22
390pF
C20
10uF25V
+E
Q2
2SC4793
X4
C3
220uF25V
FAN
24 Vdc
C7 10pF
R11
26.7K 1%
+E
U1
TDA7294V
IN -
IN +
IN+MUTE
MUTE
STBY
STBY-GND
R26
U3
IN -
IN +
IN+MUTE
MUTE
STBY
STBY-GND
C27 10pF
26.7K 1%
TDA7294V
+PWVs
BOOTSTRAP
-PWVs
+PWVs
BOOTSTRAP
-PWVs
FAN1
24Vdc/0.19A
13
7
+Vs
14
OUT
6
8
-Vs
15
-E
+E
13
7
+Vs
14
OUT
6
8
-Vs
15
-E
C5 10uF50V
C15
0.1
C19 10uF50V
C17
0.1
R3 8R2 1W
L1 1.0uH
R37 8R2 1W
L4 1.0uH
C29
0.1uF100V
CH.1 (L)
OUTPUT
X2
RED
C1
0.1uF100V
CH.2 (R)
OUTPUT
X10
RED/BLACK STRIP
OUTPUT PCB
18AWG RED
RED
RED/BLACK STRIP
18AWG RED/BLACK STRIP
18AWG BLACK
X1 NL4MP
P1
1+
1-
OUTPUT
2+
CH.1 (L)
2-
X2 NL4MP
P3
1+
1-
OUTPUT
CH.2 (R)
2+
2-
P2
BLACK
18AWG BLACK
2
3
4
10
9
1
R16
5.1K
R19
5.1K
2
3
4
10
9
1
Page 9
Page 10
In the USA: If you experience problems with this unit,
call 1-732-738-9003 for Gemini Customer Service.
Do not attempt to return this 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 this product is
performed by Gemini Sound Products Corp. or its authorized agents.
Gemini Sound Products Corp. will not accept liability for loss or damage
caused by maintenance or repair performed by unauthorized personnel.
Worldwide Headquarters • 120 Clover Place, Edison, NJ 08837 • USA
Tel: (732) 738-9003 • Fax: (732) 738-9006
France • G.S.L. France • 11, Avenue Leon Harmel, Z.I. Antony, 92160 Antony, France
Germany • Gemini Sound Products GmbH • Ottostrasse 6, 85757 Karlsfeld, Germany
UK • Gemini Sound Products • Unit C4 Hazleton Industrial Estate, Waterlooville, UK P08 9JU
Spain • Gemini Sound Products S.A. • Rosello, 516, Barcelona, Spain, 08026
© Gemini Sound Products Corp. 2002 All Rights Reserved
Tel: + 33 (0) 1 55 59 04 70 • Fax: + 33 (0) 1 55 59 04 80
Tel: 08131 - 39171-0 • Fax: 08131 - 39171-9
Tel: 087 087 00880 • Fax: 087 087 00990
Tel: 349-3435-0814 • Fax: 3493-347-6961
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