Gemini Musical Instrument BPM 150 User Manual

OPERATIONS MANUAL  
Bedienungsanleltung  
Manual de funcionamiento  
Manual de fonctionnement  
Manual del utente  
BPM-150  
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  
 
Introduction  
Using the Ground Lift Switch  
Congratulations on purchasing the Gemini BPM-150 mixer. This state of  
the art mixer includes the latest features and is backed by a three year  
limited warranty, excluding crossfader and channel slides. Prior to use,  
we suggest that you carefully read all the instructions.  
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 mixer on, listen to the system in idle mode (no signal present)  
with the ground applied (the GROUND LIFT SWITCH (4) in the left  
position).  
Features  
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.  
2 Stereo channels  
2 Phono/Line Convertible, 1 Phono, 1 Line and 1 Mic input  
1/4" DJ Mic jack  
Low, Mid, High and Gain controls on each channel  
Master output control  
CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER MIXER  
IN ANY WAY. TERMINATION OF THE AC GROUND CAN BE HAZARDOUS.  
Cue section  
Operation  
1. POWER ON: Once you have made all the equipment connections to  
Cautions  
your mixer, press the POWER (1) switch.  
1. All operating instructions should be read before using this equipment.  
2. CHANNEL 1: The GAIN (13), HIGH (20), MID (21), and LOW (22)  
controls allow you to fully adjust the selected source. Switch # (23)  
allows you to select either the PHONO 1 (12) or the PHONO 2/LINE 1  
(11) input. The CHANNEL SLIDE (24) controls the output level of this  
channel.  
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 1-732-969-9000 for customer service. Do not return  
equipment to your dealer.  
3. CHANNEL 2: The GAIN (39), HIGH (32), MID (33), and LOW (34)  
controls allow you to fully adjust the selected source. Switch # (35)  
allows you to select either the PHONO 3/LINE 2 (7) or the LINE 3 (6)  
input. The CHANNEL SLIDE (36) controls the output level of this  
channel.  
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.  
NOTE: There is Low, Mid and High equalization for each  
channel with an extremely wide range of adjustment giving  
you a smoother mix.  
5. When moving this equipment, it should be placed in its original carton  
and packaging. This will reduce the risk of damage during transit.  
SUGGESTION: You can use the Cut Features on each channel to  
remove Low, Mid and/or High to create special effects.  
6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.  
4. CROSSFADER SECTION: The CROSSFADER (31) allows the mixing of  
one source into another. The left side of the CROSSFADER (31) is  
CHANNEL 1 and the right side is CHANNEL 2. The CROSSFADER (31)  
in your unit is removable and if the need arises can be easily replaced.  
Crossfader units are available in three varieties. Part # RF-45 (which  
is identical to the crossfader supplied with the mixer) has a 45 mm  
travel from side to side. Part # RF-30 is available with a 30 mm travel  
distance. Also available is the PSF-45 with a special curve designed  
for scratch mixing. Just purchase one of these crossfader units from  
your Gemini dealer and follow these instructions:  
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 (2) switch is set to the correct voltage.  
NOTE: This product is double insulated and not intended  
to be grounded.  
1. Unscrew the outside FADER PLATE SCREWS (B). Do not  
touch the INSIDE SCREWS (C).  
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.  
2. Make sure that the POWER (1) switch is in the off position.  
3. The BPM-150 is supplied with 2 sets of output jacks. The OUTPUT  
AMP (3) jacks are used to connect to your main amplifier. The  
OUTPUT REC (5) jacks can be used to connect the mixer to the  
record input of your recorder enabling you to record your mix.  
4. Screw the fader to the mixer.  
4. The DJ MIC (26) input (found on the front panel) accepts a 1/4"  
connector and balanced and unbalanced microphones.  
5. On the rear panel are 2 stereo PHONO/LINE (7, 11) inputs, 1 stereo  
PHONO (12) input and 1 stereo LINE (6) input. The PHONO/LINE  
SWITCHES (8, 10) enable you to set the (7, 11) inputs to Phono or  
Line. The phono inputs will accept only turntables with a magnetic  
cartridge. A GROUND SCREW (9) 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.  
6. Headphones can be plugged into the front panel mounted  
HEADPHONE (38) jack.  
Page 2  
 
The CROSSFADER CURVE BUTTON (19) allows you to adjust the kind  
of curve the crossfader has. Depress the crossfader curve button  
to make the curve steep and cutting (perfect for scratching).  
11. DISPLAY: The peak hold, dual function DISPLAY (27) indicates either  
the MASTER output left and right levels or the channel 1 and channel  
2 levels. You can choose the option you want by pressing the  
DISPLAY (28) button.  
Release the crossfader curve button  
to make the curve gradual  
and gentle. The CROSSFADER REVERSE SWITCH (29) allows you to  
reverse the crossfader so that CHANNEL 2 is controlled by the left  
side of the crossfader and CHANNEL 1 is controlled by the right side  
of the crossfader.  
NOTE: When the DISPLAY (27) is in the channel 1/channel 2  
display mode, by adjusting the individual channel gain  
controls, you can increase or decrease the signal to match  
the other channel’s signal. The channel slides and  
crossfader have no effect on the display readings.  
NOTE: When the CROSSFADER REVERSE SWITCH  
(29) is activated (moved to the right), only the crossfader  
reverses. The Channel Slides, Gain and tonal controls do  
not reverse.  
Specifications  
5. PUNCH IN: The PUNCH IN BUTTONS (18, 44) allow you to add a  
channel’s signal to the mix when the crossfader is set to the opposite  
channel.  
INPUTS:  
DJ Mic..............................................................1.5mV 600 Ohm  
Phono.........................................................................3mV 47Kohm  
Line.......................................................................150 mV 27Kohm  
OUTPUTS:  
6. BPM DISPLAY: There are BPM DISPLAYS (25, 37) for Channel 1 and  
Channel 2. They update approximately every 2.5 seconds and digitally  
display the Beats Per Minute allowing you to match the beats visually.  
BPM DISPLAY (25) reflects the Beats Per Minute of Channel 1, and  
BPM DISPLAY (37) reflects the Beats Per Minute of Channel 2.  
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.  
Amp.................................................................0 dB 1V 400ohm  
Max..............................18V Peak to Peak  
7. The BEAT OFFSET INDICATORS (30) light when the tracks of Channel  
2 and Channel 3 are within 11 BPMs of each other and display how  
aligned the beats for Channel 1 and Channel 2 are. When the RED  
LEDs light, the beats are not aligned. When the YELLOW LEDs light,  
the beats are almost aligned. When the GREEN LED lights, the beats  
are aligned perfectly.  
GENERAL:  
Low (Channels 1 - 2)........................................................+ 12dB/-32 dB  
Mid (Channels 1 - 2).........................................................+ 12dB/-32 dB  
High (Channels 1 - 2).....................................................+ 12dB/-32 dB  
Gain (Channels 1 - 2)...........................................................0 to -20dB  
Frequency Response....................................20Hz - 20KHz +/- 2dB  
Distortion................................................................................0.02%  
S/N Ratio...............................................................better than 80dB  
Talkover Attenuation..............................................................-16dB  
Headphone Impedance.........................................................16ohm  
Power Source.................................................115V/230V 60Hz/50Hz 12W  
Dimensions...............................10” x 10.24” x 3.3” (254 x 260 x 84 mm)  
Weight............................................................................6.25 lbs (3 kg)  
NOTE: If the diffence between the two channel’s beats  
exceed 11 BPM, the BEAT OFFSET INDICATORS will not  
light.  
SUGGESTION: You can use the BPM DISPLAYS to determine which  
tracks have similar or the same Beats Per Minute. When mixing two  
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 DISPLAYS and the BEAT OFFSET INDICATORS update every 2.5  
seconds and will reflect the change in BPM and indicate when the beats  
are aligned.  
NOTE: Beat mixing is a skill that requires practice. Not  
every track has a strong beat, and beat mixing works best  
with tracks with clear and strong beats.  
8. OUTPUT CONTROL SECTION: The level of the MASTER OUTPUT (3) is  
controlled by the MASTER (43) control.  
NOTE: The RECORD OUT (5) has no level control. The  
level is set by the channel slides and the gain controls of  
the selected channel. The tonal qualities are set by the  
low, mid and high controls of that same channel.  
9. 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. The MIC/TALKOVER (14) switch has three settings. When  
the MIC/TALKOVER (14) switch is in the left position, the mic and  
talkover are both off. When the MIC/TALKOVER (14) switch is in the  
center position the mic is on, the MIC INDICATOR (15) will glow, but  
talkover is off. When the MIC/TALKOVER (14) switch is in the right  
position, the mic and talkover will be on and the volume of all sources  
except the Mic input are lowered by 16 dB. MIC LEVEL (17) controls  
the level of the MIC. The MIC EQ (16) control allows you to fully adjust  
the tone of the MIC.  
10. CUE SECTION: By connecting a set of headphones to the HEADPHONE  
(38) jack, you can monitor either channel or both together. Move the  
CUE SWITCH (40) to the left to monitor CHANNEL 1. Move the CUE  
SWITCH (40) to the right to monitor CHANNEL 2. By rotating the CUE  
PGM PAN (41) control to the left you will be able to monitor the  
assigned cue signal. Rotating to the right will monitor the PGM  
(program) output. Use the CUE LEVEL (42) control to adjust the  
headphone volume without effecting the overall mix.  
Page 3  
 
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. 1999 All Rights Reserved  
5/99 - 1017  
 

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