Gemini SP-1 User Manual

INSTRUCTION MANUAL

SP-1

CIRCLE SURROUND PROCESSOR

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2 Page

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1	2	3	4	5
Front Left Speaker	Front Right Speaker	Rear Left Speaker	Rear Right Speaker	Subwoofer
Linker Frontlautsprecher	Rechter Frontlautsprecher	Linker Hinterlautsprecher	Rechter	Tieftonlautsprecher
Altavoz delantero	Altavoz delantero derecho	Altavoz trasero izquierdo	Hinterlautsprecher	Subwoofer
izquierdo	Haut-parleur avant droit	Haut-parleur arrière	Altavoz trasero derecho	Haut-parleur de graves
Haut-parleur avant	Altoparlante anteriore	gauche	Haut-parleur arrière droit	Subwoofer
gauche
	destro	Altoparlante posteriore	Altoparlante posteriore
Altoparlante anteriore		sinistro	destro
sinistro

Two Channel Stereo Configuration

Zweikanal-Stereokonfiguration

Configuración estereofónica de dos canales

Configuration stéréo deux voies

Configurazione stereo a due canali

	DANCE FLOOR
	TANZFLÄCHE
	PISTA DE BAILE
	PISTE DE DANSE
	PISTA DA BALLO
OFF	OFF
AUS	AUS
APAGADO	APAGADO
ARRÊT	ARRÊT
OFF	OFF

Two Channel Four Speaker Stereo Configuration

Zweikanal-Vierlautsprecher-Stereokonfiguration

Configuración estereofónica de cuatro altavoces y dos canales

Configuration stéréo deux voies à quatre hauts-parleurs Configurazione stereo a due canali quattro altoparlanti

DANCE FLOOR

TANZFLÄCHE

PISTA DE BAILE

PISTE DE DANSE

PISTA DA BALLO

Two Channel Four Speaker Stereo

Diagonal Configuration

Zweikanal-Vierlautsprecher-Stereodiagonalkonfiguration

Configuración diagonal estereofónica de cuatro altavoces y dos canales

Configuration stéréo deux voies en diagonale à quatre hauts-parleurs

Configurazione diagonale stereo a due canali quattro altoparlanti

DANCE FLOOR

TANZFLÄCHE

PISTA DE BAILE

PISTE DE DANSE

PISTA DA BALLO

Circle Surround Configuration

Circle Surround-Konfiguration

Configuración Circle Surround

Configuration Circle Surround

Configurazione Circle Surround

DANCE FLOOR

TANZFLÄCHE

PISTA DE BAILE

PISTE DE DANSE

PISTA DA BALLO

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Introduction

Congratulations on purchasing the Gemini SP-1. This state of the art preamp surround processor is backed by a three year warranty. Prior to use, we suggest that you carefully read all the instructions.

The SP-1 incorporates Circle Surround technology with 5 channels for surround sound playback including a low frequency output for a subwoofer. Circle Surround is backward compatible so that the source does not need surround encoding for Circle Surround playback. Four full bandwidth, discrete channels are extracted from the source without compression of the signal so playback of music achieves a level of quality and realism unmatched by any other surround system.

Features

•2 inputs, 5 outputs

•SRS™ Circle Surround sound field generator adapted for DJ use

•4 modes of operation: 2 channel stereo, 2 channel 4 speaker stereo, 2 channel 4 speaker stereo diagonal with rear channel reverse and Circle Surround for 3D enhanced sound

•No signal encoding necessary but unit will decode material that is encoded in other surround formats

•Rear effect level control adjusts the volume of the rear channels for a specific environment or music program

•Electronically balanced XLR inputs and outputs

•Subwoofer output with built-in bass enhancer

•Multi-colored signal level LED display

•On board white-noise generator for easy calibration in (Circle Surround) mode

•Individual level controls for all outputs

•Muting circuitry on all outputs and a turn-on delay prevents spikes and pops

•115/230V AC line voltage selectable

•19” 1U rack mount

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 1-732-738-9003 for customer service. Do not return 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 (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.

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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.

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.

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