Gemini Musical Instrument PS 924 User Manual

OPERATIONS MANUAL  
PS-924  
STEREO PREAMP MIXER  
 
Page 2  
 
6. Headphones can be plugged into the front panel mounted  
INTRODUCTION  
HEADPHONE (4) jack.  
Congratulations on purchasing a Gemini Platinum Series model PS-924  
mixer. This state of the art mixer includes the latest in features and  
sampling technology and is backed by a three year warranty. Prior to  
use, we suggest that you carefully read all the instructions.  
7. The PS-924 comes with a front panel XLR LIGHT (5) jack. This jack  
is for use with a gooseneck light like the Gemini GNL-500. NEVER  
plug a microphone into this jack.  
8. If you are using an off board signal enhancer, you can use the SEND  
(80) output to send the signal to the device and the RECEIVE (81)  
input jacks to bring the signal back in to the PS-924.  
FEATURES  
Digital Sampler with 5 Memory Banks  
9. The PS-924 is supplied with DJ MIC LOOP (82) jacks that can be  
used to add an audio enhancer such as a key controller to the mic  
circuit. There must be a connection to these jacks. If no device is  
being used in the DJ mic loop, then the jumper wire, (included), must  
be in place.  
Battery Backup  
4 Stereo channels (2 Phono/6 Line)  
1 DJ Mic channel  
1 Aux Mic or Line Mono channel  
Combo XLR or 1/4" DJ Mic jack  
OPERATION  
1. POWER ON: Once you have made all the equipment connections to  
your mixer, press the POWER SWITCH (1). The power will turn on  
and the POWER LED (2) will glow RED.  
Bass, Mid, Treble and Gain controls on each channel  
The DJ Mic and Aux channels have pan controls  
Assignable, removable Crossfader with Beat indicators  
Assignable Send plus Receive effects circuitry for adding off board  
sound enhancers  
2. DJ MIC SECTION: The GAIN (6), TREBLE (7), MID (8), BASS (9),  
PAN (10) and LEVEL (11) controls allow full adjustment of the DJ mic  
that is plugged into the DJ MIC (3) input.  
DJ Mic loop  
Note: The OVERLOAD LED (12) glows red when the DJ mic is being  
over driven. To correct the setting, turn down the GAIN (6) control  
until the LED goes off.  
WORDS TO THE WISE  
1. All operating instructions should be read before using this equipment.  
3. AUX CHANNEL: By using the AUX MIC/LINE (13) switch, you can  
choose between an additional mic or an additional mono line input.  
The GAIN (14), TREBLE (15), MID (16), BASS (17), PAN (18) and  
LEVEL (19) controls fully adjust the Aux Channel input you selected  
with the AUX MIC/LINE (13) switch.  
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.  
3
Do not expose this unit to direct sunlight or to a heat source such as  
a radiator or stove.  
Note: The OVERLOAD LED (20) glows red when the Aux Channel is  
being over driven. To correct the setting, turn down the GAIN (14)  
control until the LED goes off.  
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.  
HINT: Like the DJ Mic, the Aux Channel is always live. Hooking up another mic or  
a mono line device such as a sound effects generator or a drum machine, will allow  
you to play the selected source at any time.  
4. MAIN CHANNEL SECTION: To assign an input source to a channel,  
set the PHONO/LINE (29,30) and the LINE/LINE (31, 32) switches to  
their appropriate positions. To make the proper adjustments to your  
music, set the TREBLE (21), MID (22), BASS (23) and GAIN (24)  
controls and the CHANNEL (25, 26, 27, 28) slides.  
CAUTIONS  
DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.  
DO NOT USE ANY SPRAY CLEANER OR LUBRICANT ON ANY  
CONTROLS OR SWITCHES.  
5. CROSSFADER SECTION: The CROSSFADER (38) allows the mixing  
of one source into another. The PS-924 features an assignable  
crossfader. The ASSIGN (39,43) switches allow you to select which  
cannel will play through each side of the CROSSFADER. ASSIGN  
(39) switch allows you to select channel 1, 2, 3 or 4 to play through  
the left side of the CROSSFADER. ASSIGN (43) switch does the  
same to the right side of the CROSSFADER. Each assign switch has  
its own OFF (40) switch and OFF INDICATOR (41) LED. With the  
OFF (40) switch in the off position (the OFF INDICATOR (41) glows  
red), that side of the CROSSFADER (38) will be inactive.  
CONNECTIONS  
1. Before plugging in the power cord, make sure that the VOLTAGE  
SELECTOR (65) 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 (1) switch is in the off position. The  
POWER LED (2) will be off.  
3. The PS-924 is supplied with 3 sets of output jacks. The OUTPUT  
AMP (66) jacks are used to connect to your main amplifier. The  
OUTPUT REC (67) jacks can be used to connect the mixer to the  
record input of your recorder enabling you to record your mix. The  
OUTPUT BOOTH (68) jacks allow you to hook up an additional  
amplifier.  
HINT: Try using the OFF (40) switches when you are changing the ASSIGN (39,43)  
switch settings. For Example: Assume that you have a turntable hooked up to  
channel 1, a tape deck hooked up to channel 2 and a CD player hooked up to  
channel 3. The left side ASSIGN (39) switch is set to 1, the right side ASSIGN (43)  
is set to 2, and the CROSSFADER (38) is all the way to the right. Under this set of  
circumstances, channel 2 will be playing your tape deck. Now suppose you want  
to change the left side ASSIGN (39) switch to # 3 so that you can use your CD  
player. You must turn the left side ASSIGN (39) off by pressing the OFF (40) Switch  
(the OFF INDICATOR (41) glows red). Then you can make your changes to the  
setting. Reactivate the ASSIGN (39) switch by pressing the OFF (40) switch (the  
OFF INDICATOR (41) goes off). Failure to do this will result in an audio glitch when  
the assign (39) switch setting is changed.  
4. The PS-924 is equipped with 2 microphone inputs. The DJ MIC (3)  
input (found on the front panel) accepts 1/4" or XLR connectors and  
suitable for balanced or unbalanced microphones. The AUX MIC  
(69) input (found on the rear panel) is a 1/4" jack for an unbalanced  
microphone.  
5. On the rear panel are 2 stereo PHONO (70, 71)inputs, 6 stereo LINE (72,  
73, 74, 75, 76, 77) inputs and 1 mono AUX LINE (78) input. The stereo  
phono inputs will accept only turntables with a magnetic cartridge. A  
GROUND (79) screw 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.  
The CROSSFADER (38) in your unit is REMOVABLE and if the need  
arises can be easily replaced. Crossfader units are available in two  
sizes. Part # RF-45 (which is identical to the crossfader supplied  
with the PS-924) has a 45 mm travel from side to side. Also available  
is part # RF-30 which has a 30 mm travel distance Just purchase  
either of these crossfader units from your Gemini dealer and follow  
these instructions:  
Note: The AUX LINE (78) input is composed of 2 RCA jacks. When  
connecting a mono line level source, either jack can be used. By  
connecting a stereo line level device to both jacks, the input will be  
combined to one mono signal.  
Page 3  
 
1. Unscrew the outside FADER plate screws (B). Do not  
touch the INSIDE SCREWS (C).  
Select the correct Cue assign button or buttons and their respective  
LED indicators will glow. Use the HEADPHONE LEVEL (57) control  
to adjust the headphone volume with out effecting the overall mix.  
By rotating the CUE PGM PAN (58) control to the left you will be able  
to monitor the assigned cue signal. Rotating to the right will monitor  
the PGM (program) output .  
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.  
SAMPLER OPERATION  
GENERAL INFORMATION: The PS-924 Sampler uses Dynamic RAM  
memory and a 12 bit microprocessor controller. The full bandwidth  
results in true sound reproduction.  
MEMORY INFORMATION: The PS-924 comes equipped with five  
MEMORY BANKS (59). The two banks marked 2 & 2 are two seconds  
in length, the two banks marked 4 & 4 are four seconds in length and the  
bank marked 12 is twelve seconds in length. These banks are separate  
and can not be linked. You can store a different sample in each bank but  
they must be recorded individually and they must be played one at a  
time.  
6. BEAT INDICATORS: Each side of the CROSSFADER (38) has its own  
BEAT INDICATOR (42, 44). They flash at the low frequency peak  
level of each assigned source, allowing you to match the beats  
visually. BEAT INDICATOR (42) will reflect the beat of the source  
assigned to the left side of the CROSSFADER (38) and BEAT  
INDICATOR (44) will do the same for the right side.  
SAMPLERECORDING:  
1. Put the MODE SELECTOR (62) switch into the WRITE position.  
2. Select the source you want to sample from by pressing the  
appropriate ASSIGN BUTTON (61).  
3. Select the memory bank you want to record into, by pressing the  
proper MEMORY BANK (59) button.  
Note: The flashing level can be fine tuned by increasing or decreasing  
the gain and bass controls of the assigned channel.  
4. Model PS-924 is equipped with a SAMPLER REC/PLAY LEVEL (63)  
control. When the MODE SELECTOR (62) is in the WRITE mode, this  
control acts as a Record Level Control. If the OVERLOAD INDICATOR  
(62A) is blinking, it means that the input signal you are going to sample, is  
too strong and will cause he sample to be distorted. Lower the sample  
signal intensity by turning the SAMPLER REC/PLAY LEVEL (63) control  
counter clockwise. If the OVERLOAD INDICATOR (62A) is off, turn the  
SAMPLER REC/PLAY LEVEL (63) control clockwise until the  
OVERLOAD INDICATOR (62A) begins to blink and then turn the  
SAMPLER REC/PLAY LEVEL (63) control counter clockwise until the  
OVERLOAD INDICATOR (62A) goes off.  
7. OUTPUT CONTROL SECTION: The level of the AMP OUT (66) is  
controlled by the MASTER (33) slide. The BALANCE (34) control  
will allow the Amp Out signal to be balanced between the left and  
right speakers. The MONO (35) switch, when depressed, (the  
MONO LED (36) will glow), will make the Amp Out signal a mono  
signal. The BOOTH (37) control adjusts the level of the BOOTH  
OUTPUT (68).  
Note: The LED DISPLAY (48) indicates the AMP OUT (66) signal  
only and is not affected by the BOOTH OUTPUT (68) signal.  
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.  
5. Tapping the START/STOP (60) button begins the sampling process  
(the SAMPLER INDICATOR (60A) will illuminate RED). Tapping the  
START/STOP (60) button a second time ends the sample (the  
SAMPLER INDICATOR (60A) will turn off). If you do not tap the  
START/STOP (60) button a second time, the sampling process will  
stop automatically after 2, 4 or 12 seconds depending on which  
MEMORY BANK (59) was selected.  
Note: The RECORD OUT (67) has no level control. The level is set by  
the channel slides and the gain control of the selected channel. The  
tonal qualities are set by the bass, treble and mid controls of that  
same channel  
8. 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. When the TALKOVER ON/OFF (45) button is pushed  
(the TALKOVER INDICATOR (46) will glow), the volume of all sources  
except the DJ Mic and the Aux channel are reduced. The amount of  
reduction can be set between -6 dB and -36 dB by using the MUTE  
LEVEL (47) control.  
SAMPLE PLAYBACK:  
1. Put the MODE SELECTOR (62) switch into the SINGLE or REPEAT  
position.  
2. Select the memory bank you wish to play by pressing the proper  
MEMORY BANK (59) button.  
9. SEND AND RECEIVE SECTION: By using the SEND ASSIGN (49)  
switch, you can send the selected signal to some sort of audio  
enhancement device (like a digital sampler or key controller). The  
level of the signal being sent can be adjusted by the SEND (50)  
control. To receive the signal back into the PS-924, you must first  
turn on the RCV ON (51) switch (LED (52) will light). The level of the  
signal being received can be adjusted with the RECEIVE (53) control.  
3. When the MODE SELECTOR (62) is in the SINGLE or REPEAT  
mode, the SAMPLER REC/PLAY LEVEL (63) control acts as a  
Sampler Level Control.  
4. Tapping the START/STOP (60) button with the MODE SELECTOR  
(62) switch in the SINGLE position will cause the sampler to playback  
one time (the SAMPLER INDICATOR (60A) will illuminate GREEN).  
Every push of the START/STOP (60) button will restart the sample  
from the beginning. Rapid pressing of the START/STOP (60) button  
will cause a stuttering effect. Once the sample has started playback  
and the START/STOP (60) button is not pushed a second time, the  
sample will play to the end and then stop (the SAMPLER INDICATOR  
(60A) will turn off).  
Note: The signal being received back into the PS-924 can be monitored  
by using the headphones and by pressing the RECEIVE (54) cue  
control. If the RCV ON (51) switch is in the off position (LED (52)  
is off), the level of the signal can be monitored and adjusted prior to  
its playing through the output. Turning the RCV ON (51) switch to  
the on position connects the received signal to the output section.  
HINT: The RECEIVE (81) input can be used as an additional stereo line level input  
controlled by the RECEIVE (53) and activated by the RCV ON (51) switch.  
5. Tapping the START/STOP (60) button with the MODE SELECTOR  
(62) switch in the REPEAT position will cause the sample to  
continuously play over and over (the SAMPLER INDICATOR (60A)  
will illuminate GREEN). The START/STOP (60) button will act as an  
on/off switch. The first push will start the sample, the second push  
will stop it.  
10.CUE SECTION: By connecting a set of headphones to the  
HEADPHONE (4) jack, you can monitor any or all of the channels.  
CUE ASSIGN (55) buttons are for the channels 1 - 4 and the CUE  
ASSIGN (56) button is for the Aux Mic/Line Mono channel and the DJ  
Mic.  
HINT: When you are using the DJ Mic and have a device connected to the DJ Mic  
Loop, the signal you hear in the headphones includes the device in the loop.  
Page 4  
 
ROBO PLAY:  
SPECIFICATIONS  
1. With the ROBO PLAY (63A) button in the OFF POSITION (the ROBO  
PLAY INDICATOR (63B) will be OFF) and the MODE SELECTOR  
(62) switch in either the SINGLE or REPEAT mode, pressing the  
START/STOP (60) button will cause the sample to play along with  
the selected source.  
INPUTS:  
DJ Mic................................1.5mV 3Kohm balanced/unbalanced  
Aux Mic................................................1.5mV 10Kohm unbalanced only  
Aux Line....................................................150mV 27Kohm  
DJ Loop..............................................................150mV 10Kohm  
Phono................................................................3mV 47Kohm  
Line...................................................................150 mV 27Kohm  
Receive................................................................75mV 27Kohm  
OUTPUTS:  
2. When the ROBO PLAY (63A) button is in the ON position (the ROBO  
PLAY INDICATOR (63B) illuminates RED), starting the sampler mutes  
the selected source. When the sample ends, the source automatically  
turns back on.  
PITCHCONTROL:  
Amp/Booth............................................0 dB 775mV 400ohm  
Max...............................24V Peak to Peak  
Rec.................................................................225mV 5Kohm  
DJ Loop............................................................150mV 220ohm  
Send...............................................................150mV 300ohm  
SAMPLER:  
1. The PS-924 comes equipped with a sampler PITCH (64) control. To  
get a perfect sample, set the control to its center position and record  
the sample.  
2. During playback, raising or lowering the control will raise or lower  
the pitch of the sample playback. The center position will remain as  
normal pitch.  
Sampler System..............................................12 Bit Sampling  
Maximum Sample Length......................................12 Seconds  
Total Memory Capacity.........................................24 Seconds  
GENERAL:  
HINT: You can record a sample with the PITCH (64) control in any position.  
Whatever that position is will become normal sound. If you start to record a sample  
with the PITCH (64) control set at minimum (this now becomes your normal pitch), by  
increasing the pitch to maximum, the pitch effect will double in speed. Recording at  
maximum and lowering to minimum will do exactly the opposite.  
Bass.................................................................................+/- 12dB  
Mid.....................................................................................+/- 9dB  
Treble...............................................................................+/- 12dB  
Gain (Mic/Aux).........................................................0 to -40dB  
Gain (Chnls 1-4)...........................................................0 to -20dB  
Frequency Response...............................20Hz - 20KHz +/- 2dB  
Distortion........................................................................0.02%  
S/N Ratio............................................................better than 80dB  
Talkover Attenuation....................................................-6 to -36dB  
Headphone Impedance......................................................16ohm  
Power Source.....................................115/230V 50/60Hz 15W  
Dimensions.......................................482mm x 240mm x 110mm  
19" x 9 1/2" x 4 1/4"  
REMOTESTART/STOP:  
1. Plug a momentary normally open foot switch with a 1/4" plug into the  
REMOTE START/STOP (83) jack on the rear panel.  
2. This allows you to trigger the sampling process with the foot switch  
leaving your hands free to do other things.  
BATTERY BACKUP: The PS-924 is equipped with battery backup to  
retain samples. To activate this feature, a 9 volt battery (not included)  
needs to be connected to the BATTERY HOLDER (84) located on the  
rear panel. This will enable you to store samples in memory and when  
the unit is unplugged, the battery backup will retain the samples for  
future use. If the unit is unplugged with no battery attached, all  
the samples will be lost.  
Weight........................................................................11lbs (5Kg)  
LOW BATTERY INDICATOR: A low battery indicator is included with the  
PS-924. when changing the battery, make sure the unit is plugged in and  
the power is ON. Failure to adhere to this will result in lost memory. The  
low battery indicator is ON when the selected memory bank LED blinks.  
The LED will also blink if no battery is connected to the unit.  
Page 5  
 
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  
Tel (732) 969-9000 • Fax (732) 969-9090  
France • G.S.L. France • 11, Avenue Leon Harmel, Z.I. Antony, 92160 Antony, France  
Tel: + 33 (0) 1 55 59 04 70 • Fax: + 33 (0) 1 55 59 04 80  
Germany • Gemini Sound Products GmbH • Ottostrasse 6, 85757 Karlsfeld, Germany  
Tel: 08131 - 39171-0 • Fax: 08131 - 39171-9  
UK • Gemini Sound Products • Unit C4 Hazleton Industrial Estate, Waterlooville, UK P08 9JU  
Tel: 087 087 00880 • Fax: 087 087 00990  
Spain • Gemini Sound Products S.A. • Mino, 112, Nave 1, 08223 Terrassa, Barcelona, Spain  
Tel: 011-34-93-736-34-00 • Fax: 011-34-93-736-34-01  
© Gemini Sound Products Corp. 1997 All Rights Reserved  
 

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