Gemini SP-1 User manual

Page 2
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22

Page 3
1
Front Left Speaker
2
Front Right Speaker
3
Rear Left Speaker
4
Rear Right Speaker
5
Subwoofer
Two Channel Stereo Configuration Two Channel Four Speaker Stereo Configuration
Two Channel Four Speaker Stereo
Diagonal Configuration
Circle Surround Configuration
DANCE FLOOR DANCE FLOOR
OFF OFF
DANCE FLOOR DANCE FLOOR

Page 4
Connections
1. Before plugging in the power cord, make sure that the VOLTAGE
SELECTOR (9) switch is set to the correct voltage.
2. Make sure that the POWER (10) switch is in the off position. The
POWER LED (11) will be off. All connections must be made with all
equipment OFF.
3. On the rear panel is one set of electronically balanced stereo INPUTS
(7, 8). The INPUTS (7, 8) are used to connect to the output of your
mixer using standard XLR cables. The balanced inputs have three
separate conductors, two of which are signal (positive and negative)
and one which is a shield (ground). Pin 1 is ground (shield). Pin 2 is
signal hot (positive). Pin 3 is signal cold (negative).
4. The SP-1 is supplied with 5 BALANCED OUTPUTS (1, 2, 3, 5, 6). The
BALANCED OUTPUT connectors are used to connect to your
amplifiers using standard XLR cables. Connect the BALANCED
OUTPUT (1) to the amplifier for the subwoofer. Connect the
BALANCED OUTPUT (2) to the amplifier for the rear right speaker.
Connect the BALANCED OUTPUT (3) the amplifier for the rear left
speaker. Connect the BALANCED OUTPUT (5) to the amplifier for the
front right speaker. Connect the BALANCED OUTPUT (6) to the
amplifier for the front left speaker. The BALANCED OUTPUTS have
three separate conductors, two of which are signal (positive and
negative) and one which is a shield (ground). Pin 1 is ground (shield).
Pin 2 is signal hot (positive). Pin 3 is signal cold (negative).
Speaker Placement
Just like in a theater or a home surround system set up, speaker
placement should be arranged to create a box in order to maximize the
effect of the SP-1. Refer to Page 2 for greater detail. Position the
subwoofer between the front speakers. If you position the subwoofer in
front of a wall or facing away from a corner, you will gain subwoofer output.
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 unit 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. Then turn the power off before moving the GROUND LIFT SWITCH
(4). 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 unit in any
way. Termination of the AC ground can be hazardous.
Operation
1. After you have finished connection and placing the speakers in their
proper position, turn the POWER (10) on to the SP-1 (the POWER
LED (11) will glow) and the rest of your equipment.
Note: Turn on your equipment in the order that the sound
travels, beginning with the source and ending with the
amps.
2. Move the SOUND FIELD (15) control to the Circle Surround position,
then press the TEST (16) button on the SP-1. White noise will cycle
through each speaker (except the subwoofer) so that you may monitor
the levels of each speaker individually. While standing in the center of
the dance floor, check the noise levels with a sound pressure level
(SPL) meter or listen to the noise levels. Use the OUTPUT LEVEL (17,
18, 19, 20) controls to adjust the output level of the 4 channels. Note:
The REAR EFFECT LEVEL (14) is disabled in test mode. When
you’ve finished the test, use the SUBWOOFER OUTPUT LEVEL (21)
control to adjust the output level of the subwoofer.
Note: The subwoofer will work in all modes of operation and
is always on. Disconnect the subwoofer if you don’t want to
use it. See the Bass Enhancer instructions for more
information.
Front Panel Controls
1. Volume Control: Use the VOLUME (13) control to adjust the overall
volume.
2. Rear Effect Level: Starting from the center position, use the REAR
EFFECT LEVEL (14) to adjust the rear speaker levels. You may boost
the rear channels if you feel not enough sound is coming from them.
You can also readjust the rear levels for music with varying spatial
information.
3. Sound Field: Use the SOUND FIELD (15) control to choose a mode of
operation.
4. Test Button: In Circle Surround mode, press the TEST (16) button on
the SP-1, and white noise will cycle through each speaker (except the
subwoofer) so that you may monitor the levels of each speaker
individually. The test button is recessed so you can not accidentally
initiate a test in the middle of your music program.
5. Output Level Controls: Use the OUTPUT LEVEL (17, 18, 19, 20)
controls to preadjust the output levels of the 4 channels to compensate
for different amps and speaker sensitivity. Use the SUBWOOFER
OUTPUT LEVEL (21) control to adjust the output level of the
subwoofer.
6. Bass Enhancer: Press the BASS ENHANCER (22) button to boost
the level of the bass of the subwoofer by +6 dB at 40 Hz. The Bass
Enhancer works optimally with most vented prosound subwoofers, and
when activated, special filters shape the frequency response to
optimize bass performance while cutting subsonic frequencies. Note:
the Bass Enhancer only boosts the bass from the subwoofer output.
7. Signal LED: The multi-color SIGNAL LED (12) indicates the level of
the signal and changes color incrementally from green to red. When
the SIGNAL LED (12) glows red, the unit is in overload, and you
should lower the VOLUME (13). Sometimes you can also stop an
overload by lowering the REAR EFFECT LEVEL (14) or the
SUBWOOFER OUTPUT LEVEL (21). Ideally, the SIGNAL LED (12)
should flash between green and orange.
Modes of Operation
Use the SOUND FIELD (15) control to choose one of the following modes
of operation:
1. Two Channel Stereo: In this standard stereo mode, the rear speakers
are disengaged and only the front speakers function.
2. Two Channel Four Speaker Stereo: In this four speaker stereo mode,
the rear speakers mirror the front speakers’ program signal.
3. Two Channel Four Speaker Stereo Diagonal: With diagonal mode,
the rear right and left sides reverse so that the rear right speaker
mirrors the front left speaker’s program signal and the rear left speaker
mirrors the front right speaker’s program signal. This mode is useful in
large rooms or club environments to avoid people on one side of the
room hearing only one channel of a stereo program.
4. Circle Surround: In Circle Surround sound mode, any
stereo signal can be used to generate surround play. A frequency and
phase dependent amplitude based signal processor uses ambiance
and directional information already present in the stereo signal to
generate 3D surround sound. And unlike other surround formats where
the rear output is mono and bandwidth limited, Circle Surround
separates the left and right rear channels with full bandwidth. In this
mode, the rear speakers will not output the full program (the rear levels
will be lower than the front), because the rear speakers are used to
create an enhanced spatial perception. Note: The Circle Surround
Experience is dependent on the source itself, therefore some tracks of
music may sound better in Circle Surround than others. Signals
encoded for Circle Surround will give you the best circle surround
experience.

Page 5
Specifications
Balanced Inputs:
Sensitivity..........................................................................................1 VRMS
Impedance......................................................................................20 kOhm
Balanced Outputs:
Level...................................................................................................2 VRMS
Impedance.......................................................................................600 Ohm
Frequency Response:
Stereo Mode.......................................................10 Hz - 60 kHz +0, -1 dB
Circle Surround Mode........................................10 Hz - 22 kHz +0, -1dB
Distortion:
Stereo Mode......................................................................................<0.01%
Circle Surround Mode.......................................................................<0.15%
S/N Ratio:
Stereo Mode......................................................................................>90 dB
Circle Surround Mode Front Channels.............................................>80 dB
Circle Surround Mode Rear Channels.............................................>55 dB
Subwoofer Channel:
Low Pass Filter...........................................................@ 100 Hz, 12 dB/oct
High Pass Filter..............................................................@ 15 Hz, 6 dB/oct
High Pass Filter in Enhanced Mode...........................+ 6 dB @ 40 Hz (Q=2),
12 dB/oct
Rear Channel Effect Max./Min. Ratio................................................12 dB
Power Source.......................................................115V/230V, 60 Hz/50 Hz
Power Consumption.............................................................................10 W
Dimensions...............................19” x 1.75” x 10.5” (483 x 44 x 266 mm)
Weight..................................................................................10.5 lbs (2.5 kg)
Circle Surround and the symbol are trademarks of SRS Labs, Inc. in
the United States and selected foreign countries. Circle Surround
technology is incorporated under license from SRS Labs, Inc.
is a trademark of Valence Technology Limited, in China, Hong Kong
and Taiwan. CS technology is incorporated with permission of Valence
Technology Limited.
Description Part #
Cabinet Parts and Packing
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Item #
Parts Lists
002-292
031-035
032-070
034-070
022-305
003-998
003-733
003-139
003-140
002-536
002-537
049-206
146-710
196-062
157-963
255-132
153-137
156-089
110-153A
110-158
111-043A
111-046A
111-055
121-003A
PANEL CONTOL
COVER TOP
COVER BOTTOM
PANEL REAR
AC SOURCE FIXER
LED HOLDER 3f (8.5mm)
LED HOUSING
KNOB ROTARY (BIG)
KNOB ROTARY (SMALL)
KNOB PUSH
BUSHING PUSH KNOB
PAD FOOT
GND SCREW
SERIAL NO, LABEL
OWNER’S MANUAL
GIFT BOX
POLYFORM
WARRANTY CARD
PAN-HEAD TAPPING SCREW (TWIN
TOOTH)PAN-HEAD TAPPING SCREW
FLAT-HEAD TAPPING SCREW (5.1-5.3)
BAND-HEAD TAPPING SCREW
BAND-HEAD TAPPING SCREW
BAND-HEAD TAPPING SCREW/TW-E
262-241
262-242
262-243
PRINTED CIRCUIT BOARD SP-1-1
PRINTED CIRCUIT BOARD SP-1-2
PRINTED CIRCUIT BOARD SP-1-3
Description Part #
Printed Circuit Boards
Item #
1
2
3

Page 6
080-111
076-104
072-295
079-003
079-027
079-056
082-030
083-114
083-115
071-217
071-218
071-219
LED (GREEN/RED) 3 mm
TRANSISTOR 2SA1048 (2SA1317)
TRANSISTOR 2SC2878
SILICON DIODE 1N4148
RECTIFIER DIODE 1N4002
ZENER DIODE 1/2 W 3.3V
ROTARY SWITCH 1-4-3 L=17mm SOUND FIELD
PUSH BUTTON SWITCH LOCK;PC1 SW3
BASS ENHANCER
PUSH BUTTON SWITCH UNLOCK;PC1 SW2
TEST NOISE
ROTARY VR 16 mm 10KA×2 VOLUME
ROTARY VR 16 mm 10KB FADER
ROTARY VR 9 mm 10KA
LD1
Q1, Q2, Q6
Q3-5
D1-5, D10-14
D6-9
ZD1, ZD2
SW1
SW3
SW2
VR1
VR2
VR3-7
Designators Description Part #
Electrical Parts
Item #
1
2
3
4
5
6
7
8
9
10
11
12
074-022
074-163
074-168
074-172
074-171
074-173
074-174
074-175
074-088
074-089
INTEGRATED CIRCUIT LB1403N
INTEGRATED CIRCUIT 4558DD
(BA15218,M5218A)
INTEGRATED CIRCUIT TL072CP
INTEGRATED CIRCUIT SSM2005RS-REEL
INTEGRATED CIRCUIT PIC16C505-04/P
INTEGRATED CIRCUIT NJM78L05A
INTEGRATED CIRCUIT NJM78L06A
INTEGRATED CIRCUIT NJM79L06A
INTEGRATED CIRCUIT NJM7815FA
INTEGRATED CIRCUIT NJM7915FA
IC1
IC2-3,IC12-15
IC6
IC7
IC9
IC8
IC4
IC5
IC11
IC10
Designators Description Part #
ICs
Item #
1
2
3
4
5
6
7
8
9
10
Parts Lists - Main PCB
Parts Lists - Switch PCB
LED (RED) 3 mm
POWER SWITCH
CERAMIC CAPACITOR UL 0.0047µ/400V
DO3
SWO1
CO2
Designators Description Part #
Electrical Parts
Item #
1
2
3
080-003
083-070
151-156
074-163INTEGRATED CIRCUIT 4558DD
(BA15218,M5218A)
IC1-4
Designators Description Part #
ICs
Item #
1
Parts Lists - Input/Output PCB
076-095
076-104
079-003
092-113
092-069
081-030
TRANSISTOR 2SC2878
TRANSISTOR 2SA1048 (2SA1317)
SILICON DIODE 1N4148
PHONE JACK XLR
PHONE JACK XLR
SLIDE SWITCH PC1 GND LIFT
Q2-11
Q1
D1-2
XLR3-7
XLR1-2
SW1
Designators Description Part #
Electrical Parts
Item #
1
2
3
4
5
6

Page 6
Main PCB

Page 7
Input/Output PCB

Page 8
Switch PCB

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24 25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
SSM2005
IC7
C9
0.1
R18
100
C19 10uF25V
C10
0.1 R26100
C18
10uF25V
-6V
+6V
C16
0.1
C17
0.1
C29
10uF25V
2
31
4 8
IC6A
TL072CN
R27
162K1%
R28
40.2K1%
R25
787R1%
C20
0.1 C22
1n
C21
1n
C31
10uF25V
6
57
IC6B
TL072CN
R21
787K1%
R17
7.87K1%
R23
787R1%
C8
0.1
C12
10n
C11
100pF
C14 0.1
C13 0.1
R22 909R1%
R24 909R1%
C23
47n
C28
1uF 50V
C15
0.1
R29
453R1%
R20 453R1%
R19 453R1%
R16
453R1%
C24
1uF 50V
C6
0.1
C27
1uF25V NP
R33
4.7M R30
10K
C30
22uF25V C34
1uF 50V
C32
1uF 50V C38 1uF 50V
R31
1K1% R35 1K1%
C33
1uF50V
C39
0.1 C35 0.22
R32
274K1% C42
1uF25V NP C37 1uF25V NP
R38
100K1%
C43
0.1 C40 0.22
R41
274K1%
C36
0.47
C41
1uF25V NP
R34
3.83K1% R39
33.2K1%
1
2
3
X4
PLUG3
D8
1N4002
D6
1N4002
D7
1N4002
D9
1N4002
C51
2200uF25V
C47
2200uF25V C48
100uF25V
C52
100uF25V C4
0.047uF
C7
0.047uF
+15V
-15V
+Vin
3
GND
2
+Vout 1
IC4
NJM78L06A
+Vin
1
GND
2
+Vout 3
IC11
NJM78M15A
-Vin
2
GND 1
-Vout 3
IC5
NJM79L06A
-Vin
2
GND 1
-Vout 3
IC10
NJM79M15FA
+6V
-6V
1 9 2 6 3 4
7 8 5
GRDFLT IN
-10dB -5dB 0dB +3dB +6dB +Vcc
IC1
LB1403N
R8
100K R7 10K
R6
36K
C1
10uF25V
C2
10uF25V
R2
100
-15V
VR5
10KA
R60
14.7K1%
R58
16.5K1%
R55
14.7K1%
C57
0.22
C62
47nF
2
31
4 8
IC15A
NJM4558DD
6
57
IC15B
NJM4558DD
C60
0.22
C61
0.22 R54
97.6K1%
R57
294K1%
R59
4.53K1%
2 5
1
6
3
4
SW3
SW2
ENHANCED BASS
C45
0.1 LOAD
DATA
CLOCK
CLOCK
DATA
LOAD
+Vin
3
GND
2
+Vout 1
IC8
NJM78L05A
VR6
10KA
2
31
4 8
IC12A
NJM4558DD
VR4
10KA
LOAD
+15V
+15V
+15V
-15V
-15V
-15V
R1
2.2K
1
2
X1
PLUG2
R3
100
Q1
2SA1317
R4
2.2K
R9
2.2K
R10
2.2K
Q2
2SA1317
R5
2.2K
R11
20K
D1
1N4148
D4
1N4148
D11
1N4148
D14
1N4148
+15V
GA
RAC
LD1 LU204615
D5
1N4148
D13
1N4148
D12
1N4148
C26
1uF50V
C25
1uF50V
6
57
IC12B
NJM4558DD
VR3
10KA
2
31
4 8
IC13A
NJM4558DD
+15V
-15V
6
57
IC13B
NJM4558DD
2
31
4 8
IC14A
NJM4558DD
6
57
IC14B
NJM4558DD
R56
20K1%
R53
20K1%
2 5
1
6
3
4
SW2
NOISE
2
31
4 8
IC3A
NJM4558DD
6
57
IC3B
NJM4558DD
2
31
4 8
IC2A
NJM4558DD
6
57
IC2B
NJM4558DD
R14
5.76K1%
R12
5.76K1%
R13
10K1%
R15
10K1%
+15V
-15V
ZD1
1N5226 3.3V
D10
1N4148
ZD2
1N5226 3.3V
R52
20K1%
VR7
10KA
3
4
2
5
1
6
SW1A
4WAY4
9
10
8
11
7
12
SW1B
4WAY4
21
22
20
23
19
24
SW1D
4WAY4
15
16
14
17
13
18
SW1C
4WAY4
R51
4.53K1%
R50
4.53K1%
R48 3.32K1% R49 3.32K1%
C3
10uF25V
C5
10uF25V
Lm
Lm
Lm
Lm
Lm
+15V
-15V
1
2
3
4
5
X2
PLUG5
C49
0.1
C50
0.1
D2
1N4148 D3 1N4148
R36
3.32K1%
R37
3.32K1%
1
2
3
VR2A
10KB
6
5
4VR2B
10KB
NOISE
NOISE
R46
10K
R45
1K
R42
1K
R40
100K
R43
1K
Q5
2SC2878
Q4
2SC2878
Q3
2SC2878
Q6
2SA1317
R47
390K
C46
0.1
FADER
+15V -15V
+15V
-15V
C54
0.047uF C55 0.047uF C56 0.047uF
C53
0.047uF C59 0.047uF C58 0.047uF
1
2
3
VR1A
10KA
4
5
6
VR1B
10KA
1
2
3
X3
PLUG3
+15V
-15V
C44
0.1
2 CH
4 CH
4 CH/DIAG
S C
Vss 14 VDD
1RB5
2RB4
3RB3
4RC5
5RC4
6RC3
7RC2 8
RC1 9
RC0 10
RB2 11
RB1 12
RBO 13
PIC16C505
IC9
FADER
1
2
3
4
5
6
7
X5
PLUG7
RESET
RESET
R44
1.5K
+5V
JP36
0
SUB
LF
RF
LS
RS
+5V
41 STEP
GND
SHIELD
R61
51K
+5V
C65
10uF25V
C66 10uF25V
C64
10uF25V
C63
10uF25V
C67
10uF25V
+5V
C19 10uF25V
Q10
2SC2878
R54 4.7K
R51 33
R52
47k
R56 270
1
2
3
4
5
6
7
X3
PLUG7
2
31
4 8
IC4A
NJM4558DD
R60 10K1%
21
3
XLR7
C23 10uF25V
Q11
2SC2878
R554.7k
R57 33
R58
47k
R61 270
R59
10K1%
C21
0.047uF
C22
0.047uF
+15V
-15V
SUB
LF
RF
LS
RS
Q1
2SA1317
C9
220uF25V
C7
4.7uF25V
R11
390K
R10
680K
R9 1K
D2
1N4148
D1
1N4148
+15V
-15V
6
57
IC4B
NJM4558DD
C10 10uF25V
Q2
2SC2878
R12 4.7K
R16 33
R17
47k
R14 270
2
31
4 8
IC2A
NJM4558DD
R15 10K1%
21
3
XLR3
C12 10uF25V
Q3
2SC2878
R194.7k
R21 33
R20
47k
R18 270
R13
10K1%
C14
0.047uF
C11
0.047uF
+15V
-15V
C13 10uF25V
Q4
2SC2878
R27 4.7K
R22 33
R23
47k
R24 270
6
57
IC2B
NJM4558DD
R26 10K1%
21
3
XLR4
C16 10uF25V
Q5
2SC2878
R294.7k
R30 33
R33
47k
R28 270
R25
10K1%
C15 10uF25V
Q6
2SC2878
R35 4.7K
R31 33
R32
47k
R34 270
2
31
4 8
IC3A
NJM4558DD
R43 10K1%
21
3
XLR5
C18 10uF25V
Q7
2SC2878
R364.7k
R37 33
R39
47k
R40 270
R38
10K1%
+15V
-15V
C17 10uF25V
Q8
2SC2878
R47
4.7K
R41 33
R42
47k
R44 270
6
57
IC3B
NJM4558DD
R50 10K1%
21
3
XLR6
C20 10uF25V
Q9
2SC2878
R484.7k
R46 33
R49
47k
R53 270
R45
10K1% RS
LS
RF
LF
SUB
GND
SHIELD
2
31
4 8
IC1A
NJM4558DD
6
57
IC1B
NJM4558DD
R810K1%
R7 10K1%
R110K1%
R3 10K1%
R510K1%
R4
10K1%
C1 100pF
C2
100pF
C5
100pF
C6 100pF
R610K1%
R210K1%
2 1
3
XLR2
2 1
3
XLR1
1
2
3
X2
PLUG3
1
2
3
4
5
X1
PLUG5
-15V
+15V
C4
0.047uF
C3
0.047uF
-15V
+15V
R
L
R
L
SHIELD
GND
GND
PT1
PT
SW110-220
F1
FUSE 0.5A
SW1
POWER SW
AC 220/110 V
C58
472/400V
1
2
3
2
1
3
5
6
4
SW1a
SW1b
C8
103
AC
GND
AC
1
2
X01
PLUG2
D03
SWITCH PCB
INPUT/OUTPUT PCB
MAIN PCB
Page 9
Schematic