Gemini Musical Instrument PS 850i User Manual

OPERATORS MANUAL  
BEDIENUNGSHANDBUCH  
MANUAL DEL OPERADOR  
MANUEL D’INSTRUCTIONS  
PS-850i  
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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PS-850i  
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The REC OUTPUT (41) (RCA type) jacks can be used to  
connect the mixer to the record input of your recorder  
enabling you to record your mix.  
The BOOTH OUTPUT (40) (RCA type) jacks allow you to  
hook up an additional amplifier.  
INTRODUCTION  
Congratulations on your purchase of the  
Stereo PreAmp Mixer. This-state-of-the-art mixer is backed by  
a three year warranty, excluding crossfader and channel slides. Prior to  
plugging in, we suggest you carefully read these instructions.  
PS-850i  
4. The MIC 1 (1) input (found on the front panel) accepts XLR &1/4"  
connectors. The MIC 2 (56) input and the MIC 3 (55) input (found  
on the rear panel) accept 1/4" connectors. All accept balanced and  
unbalanced microphones.  
FEATURES  
4 Stereo Channels  
5. On the rear panel are three (3) stereo PHONO/LINE (47, 50, 53)  
inputs and 5 stereo LINE (44, 45, 46, 49, 52) inputs.  
State-of-the-Art Cue Section  
3 Phono/Line Convertible, 5 Line, and 3 Mic Inputs  
BPM displays and beat offset indicators.  
Cut Feature for Low, Mid and High for Each Channel  
Gain, High, Mid and Low Tone Controls for Each Channel  
Talkover  
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/LINE SWITCH (54) enables you to set the (53)  
input to Phono or Line.  
The phono inputs will accept only turntables with a magnetic cartridge.  

Loop  
6. A turntable GROUND SCREW (57) is located on the rear panel.  
Balanced and Unbalanced Master Outputs  
Booth and Record Outputs  
7. Headphones can be plugged into the front panel mounted  
HEADPHONE JACK (36) .  
8. The PS-850i features a front panel BNC LIGHT JACK (30) . This  
Dual Mode Display  
jack is for a gooseneck lamp such as the Gemini GNL-700  
.
CAUTIONS  
1. Read all operating instructions before using this equipment.  
9. There are LOOP INPUTS (43) and LOOP OUTPUTS (42) located on  
the rear panel. If you are using an outboard signal processor, you  
can use the LOOP OUTPUTS (42) to send the signal to the device  
and the LOOP INPUTS (43) to bring the signal back in to the mixer.  
The unit comes with jumpers to be used with the loop inputs and  
outputs. Keep the jumpers in the unit if you are not using the loop to  
prevent interruptions in your music program.  
2. To reduce the risk of electrical shock, do not open the unit. THERE  
ARE NO USER REPLACEABLE PARTS INSIDE. Please refer all unit  
servicing to a qualified  
Sound Products service  
technician.  
In the USA: If you experience problems with this unit,  
please call 1 (732) 969-9000 for Gemini Customer Service.  
THE GROUND LIFT SWITCH  
epending on your system configuration, applying the ground  
sometimes creates a quieter signal path. Sometimes “lifting” the  
Do not attempt to return this equipment to your dealer.  
D
ground eliminates loops and hum to create a quieter signal path.  
1. Listen to the system with the unit ON, without music, and with the  
3. Do not expose this unit to direct sunlight or to heat sources such  
as a radiator or stove.  
ground “applied.” GROUND LIFT SWITCH (58) should be to the left.  
4. This unit should be cleaned with a damp cloth ONLY. Avoid solvents  
and other cleaning detergents. Do not use spray cleaner or lubricant  
on controls or switches.  
2. Turn power OFF before moving the GROUND LIFT SWITCH.  
3. Now, “lift” the ground by moving the GROUND LIFT SWITCH to the  
right. Turn the power back ON and listen to determine which position  
provides a signal free of background noise and hum.  
5. When moving this equipment, it should be placed in its original carton  
and packaging to reduce the risk of damage during transit.  
Note: Keep GROUND LIFT in the ground “applied” or left  
position if noise level remains the same in either position.  
6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.  
CONNECTIONS  
1. Before plugging in the power cord, make sure that the VOLTAGE  
SELECTOR (37) switch is set to the correct voltage.  
CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER  
KCABLE. TERMINATION OF THE AC GROUND CAN BE HAZARDOUS.  
NOTE: This product is double insulated  
and is not intended to be grounded.  
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. Make sure that the POWER (31) switch is in the OFF position.  
The POWER LED (32) will be OFF.  
3. The PS-850i is supplied with four (4) sets of output jacks.  
2. CHANNEL 1: The GAIN (8), HIGH (9), MID (10), and LOW (11)  
controls allow you to fully adjust the selected source. Switch (12)  
allows you to select the PHONO 1/LINE 1 (53) or the LINE 2 (52)  
input. CHANNEL SLIDE (13) controls the input level of this channel.  
The XLR BALANCED OUTPUT (38) jacks are used to  
connect to your main amplifier using standard XLR cables.  
We recommend using balanced amp outputs if the cables to  
your amp are 10 feet or more. XLR 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).  
3. CHANNEL 2: The GAIN (8), HIGH (9), MID (10), and LOW (11)  
controls allow you to fully adjust the selected source. Switch (14)  
allows you to select the PHONO 2/LINE 3 (50) or the LINE 4 (49)  
input. CHANNEL SLIDE (15) controls the input level of this channel.  
4. CHANNEL 3: The GAIN (8), HIGH (9), MID (10), and LOW (11)  
The MAIN OUTPUT (39) (RCA type) jacks are unbalanced  
and used to connect to your main amplifier.  
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controls allow you to fully adjust the selected source. Switch (16)  
allows you to select the PHONO 3/LINE 5 (47) or the LINE 6 (46)  
input. CHANNEL SLIDE (17) controls the input level of this channel.  
8. OUTPUT CONTROL: The level of the AMP OUT (38, 39) is  
controlled by the MASTER (29) slide and BALANCE (28) control.  
Activating the MONO (27) button (the mono LED will light) makes the  
overall output mono. The BOOTH (26) control adjusts the level of the  
BOOTH OUTPUT (40).  
5. CHANNEL 4: The GAIN (8), HIGH (9), MID (10), and LOW (11)  
controls allow you to fully adjust the selected source. Switch (18)  
allows you to select the LINE 7 (45), LINE 8 (44) or the MIC 3 (55)  
input. CHANNEL SLIDE (19) controls the input level of this channel.  
9. TALKOVER: The purpose of the talkover is to allow the program  
playing to be muted so that the mic may be heard above the music.  
The MIC/TALKOVER SWITCH (7) controls MIC 1 and MIC 2 and  
has three settings.  
PLEASE NOTE: There is Low, Mid and High equalization for  
each channel with an extremely wide range of adjustment.  
SUGGESTION: You can use the Cut Features on each channel  
to remove Low, Mid and/or High range to create special effects.  
When MIC/TALKOVER (7) is in the BOTTOM position,  
MIC and TALKOVER are OFF.  
When MIC/TALKOVER (7) is in the CENTER position, MIC is  
ON. MIC INDICATOR (6) glows. TALKOVER is OFF.  
he Crossfader in your unit is removable, and should the  
need arise, can easily be replaced by following these  
When MIC/TALKOVER SWITCH (7) is in the TOP position,  
MIC and TALKOVER are ON and the volume of all sources  
except MIC input is lowered by 16 dB. MIC 1 LEVEL (5)  
controls the level of MIC 1. MIC 2 LEVEL (4) controls the  
level of MIC 2.  
T
instructions. Note: Gemini replacement Crossfaders are  
available in three varieties: the RG-45 PRO (RAIL GLIDE™) Dual-Rail  
Crossfader; the RF-45, which has a 45mm travel from side-to-side;  
and the PSF-45, which features a special “curve” designed for scratch  
mixing.  
10.CUE: By connecting a set of headphones to the HEADPHONE JACK  
(36), you can monitor any or all of the channels. Press the CUE  
ASSIGN (23) buttons for channels 1 - 4 to select the channel or  
channels to be monitored and their respective LED indicators will  
glow.  
1. Unscrew the outside  
FADER PLATE SCREWS (B).  
Use CUE LEVEL (33) control to adjust cue volume without affecting  
the overall mix. By moving the CUE PGM PAN (35) 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.  
- Do not touch INSIDE SCREWS (C).  
2. Carefully remove old Cross-  
fader and unplug CABLE (D).  
3. Plug new Crossfader into  
CABLE (D) and place back into mixer.  
Use the CUE SPLIT (34) button to split the signals from cue and  
program so that cue will be heard in one earphone and program  
in the other.  
`
4. Screw Crossfader to mixer with  
FADER PLATE SCREWS (B).  
11. DISPLAY: The peak hold, dual function DISPLAY (24) indicates  
either the MASTER (38, 39) output left and right levels OR the  
selected cue and program (premaster output) levels. You can  
choose the option you want by pressing the DISPLAY (25) button.  
D
Your Gemini mixer comes with an RG-45 PRO (RAIL  
GLIDE™) DUAL-RAIL CROSSFADER. Rail Glide™  
Crossfaders have internal dual stainless steel rails that allow the  
slider to ride smoothly and accurately from end to end.  
NOTE: When the DISPLAY is in the cue/program mode you  
Úcan increase or decrease the signal to match the other  
channel’s signal simply by adjusting GAIN (8).  
6. CROSSFADER SECTION: The CROSSFADER (21) allows the mixing  
of one source into another. The PS-850i 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 4 settings (1, 2, 3 or 4) and allows you to  
select channel 1, 2, 3 or 4 to play through the left side of the  
crossfader. The ASSIGN (22) switch has 4 settings (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. There are two OFF (60, 61) buttons for  
the crossfader. When the OFF (60) button is pressed, the left side  
of the crossfader will be inactive and the OFF LED (62) will light.  
When the OFF (61) button is pressed, the right side of the  
12.The TREBLE (2) and BASS (3) controls allow you to adjust  
the tone of MIC 1 and MIC 2.  
13.BPM DISPLAY: There are BPM DISPLAYS (57, 58) for the two  
channels assigned to each side of the CROSSFADER (21). They  
update approximately every 2.5 seconds and digitally display the  
Beats Per Minute allowing you to match the beats visually. BPM  
DISPLAY (57) reflects the Beats Per Minute of the channel assigned  
to the left side of the CROSSFADER, and BPM DISPLAY (58)  
reflects the Beats Per Minute of the channel assigned to right the  
side of the CROSSFADER.  
crossfader will be inactive and the OFF LED (63) will light. Using the  
OFF button, be sure to deactivate the crossfader before changing  
the ASSIGN setting. This will avoid any click or popping sound in  
your signal while you are changing the assign setting.  
NOTE: A [- -] reading will appear on the BPM DISPLAY if  
the track has unclear beats. The [- -] reading will also  
appear if there is no signal present.  
7. LOOP: Removing the jumpers from the LOOP OUTPUT (42) and  
INPUT (43) jacks will activate the loop. Any device connected to  
the LOOP OUTPUT (42) and INPUT (43) jacks will be inserted into  
the signal path.  
14.The BEAT OFFSET INDICATORS (59) light when the tracks of the  
two channels assigned to the crossfader are within 11 BPMs of  
each other and display how aligned the beats of the two channels  
are. When the YELLOW LEDs light, the beats are almost aligned.  
When the GREEN LED lights, the beats are aligned perfectly.  
HINT: BOOTH OUTPUT (40) is used by some DJs to run  
monitor speakers in the DJ Booth. You can also use it as a  
second ZONE or AMP output.  
NOTE: If the difference between the two channel’s  
Úbeats exceed 11 BPM, the BEAT OFFSET INDICATORS  
will not light.  
NOTE: The RECORD OUT (41) has no level control. The  
Úlevel is set by the channel slides and the gain controls of the  
selected channel. Tonal qualities are set by the LOW, MID and  
HIGH controls of that same channel.  
SUGGESTION: You can use the BPM DISPLAYS to determine which  
tracks have similar or the same Beats Per Minute. When mixing two  
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tracks with similar Beats Per Minute, you can use one source’s pitch  
control to align the Beats Per Minute with the other source’s BPM. The  
BPM DISPLAY and the BEAT OFFSET INDICATORS update every 2.5  
seconds and will reflect the change in BPM and indicate when the  
beats are aligned.  
SPECIFICATIONS  
INPUTS:  
Phono @ 1kHz.......................................................................2mV 47 kΩ  
Line...............................................................................100 mV 10 kΩ  
MIC 1 , MIC 2 & MIC 3....................................................1.5mV 2 KBalanced  
OUTPUTS:  
NOTE: Beat mixing is a skill that requires practice. Not every  
track has a strong beat, and beat mixing works best with  
tracks with tracks with clear and strong beats.  
Ú
Main/Aux.......................................................................0 dB 1V 400 kΩ  
Max...............................................................................20V Peak-to-Peak  
Rec..................................................................................225mV 5 kΩ  
GENERAL:  
Low (Channels 1-4).............................................................+ 12dB/- 32 dB  
Mid (Channels 1-4)...............................................................+ 12dB/- 32 dB  
High (Channels 1-4).............................................................+ 12dB/- 32 dB  
Gain (Channels 1-4).......................................................................0 to -20dB  
Bass (MIC1 , MIC2).......................................................................± 12dB  
Treble (MIC1 , MIC2).......................................................................± 12dB  
Frequency Response............................................20Hz - 20kHz +/- 2dB  
Distortion................................................................................less than 0.02%  
S/N Ratio..........................................................................better than 80dB  
Talkover Attenuation........................................................................16dB  
Power Source...................................................115/230V 50/60Hz 20W  
Dimensions....................................................................19”W x 4”H x 9”D  
Weight........................................................................................10 lbs  
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