Gemini Musical Instrument BPM 250 User Manual

OPERATIONS MANUAL  
Bedienungsanleltung  
Manual de funcionamiento  
Manual de fonctionnement  
Manual del utente  
BPM-250  
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  
 
GROUND LIFT  
37  
30  
38  
LIFT  
35  
38  
38  
39  
39  
40  
40  
34  
34  
33  
33  
32  
32  
31  
31  
36  
36  
 
cartridge. A GROUND (37) 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.  
Introduction  
Congratulations on purchasing a Gemini BPM-250 mixer. This state of  
the art mixer is backed by a three year warranty, excluding crossfader  
and channel slides. Prior to use, we suggest that you carefully read all  
the instructions.  
6. Headphones can be plugged into the front panel mounted  
HEADPHONE (4) jack.  
7. The BPM-250 comes with a front panel BNC LIGHT (5) jack. This  
jack is for use with a gooseneck light like the Gemini GNL-700.  
Features  
Using the Ground Lift Switch  
Cut Feature for Bass, Mid and High of each channel  
3 Stereo channels (3 Phono, 3 Line and 1 Mic)  
Combo XLR or 1/4" DJ Mic jack  
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.  
Bass, Mid, Treble and Gain controls on each channel  
Beat indicators  
1. With the mixer on, listen to the system in idle mode (no signal  
present) with the ground applied (the GROUND LIFT SWITCH (38) in  
the left position).  
12 volt BNC light jack  
2. Then turn the power off before moving the GROUND LIFT  
SWITCH (38). 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.  
Master, Booth and Record outputs  
Dual mode display (Left & Right output or Channel 2 and Channel 3)  
Push button cueing with Cue/Program pan control  
CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER  
MIXER IN ANY WAY. TERMINATION OF THE AC GROUND CAN BE  
HAZARDOUS.  
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.  
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.  
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.  
2. CHANNEL 1: The GAIN (6), HIGH (7), MID (8), and LOW (9),  
controls allows you to fully adjust the selected source. Switch # (10)  
allows you to select either the mic or the PHONO/LINE (36) input.  
The CHANNEL (13) slide 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.  
3. MAIN CHANNEL SECTION: To assign an input source to a channel,  
first set the PHONO/LINE (11,12) switches to their appropriate  
positions. To make the proper adjustments to your music, set the  
GAIN (6), HIGH (7), MID (8) and LOW (9) controls and position the  
CHANNEL (14, 15) slide.  
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.  
NOTE: There is Low, Mid and High equalization for each  
channel with an extremely wide range of adjustment  
giving you a smoother mix.  
7. DO NOT USE ANY SPRAY CLEANER OR LUBRICANT ON ANY  
CONTROLS OR SWITCHES.  
SUGGESTION: You can use the Cut Features on each channel to  
remove Low, Mid and/or High to create special effects.  
Connections  
4. CROSSFADER SECTION: The CROSSFADER (26) allows the  
mixing of one source into another. The left side of the CROSSFADER  
(26) is channel 2 and the right side is channel 3. The CROSSFADER  
(26) 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:  
1. Before plugging in the power cord, make sure that the VOLTAGE  
SELECTOR (30) 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 BPM-250 is supplied with 3 sets of output jacks. The OUTPUT  
AMP (38) jacks are used to connect to your main amplifier. The  
OUTPUT REC (40) jacks can be used to connect the mixer to the  
record input of your recorder enabling you to record your mix. The  
OUTPUT BOOTH (39) jacks allow you to hook up an additional  
amplifier.  
4. The DJ MIC (3) input (found on the front panel) accepts a 1/4" or  
XLR connector and accepts only unbalanced microphones.  
5. On the rear panel are 2 stereo PHONO (32, 34) inputs, 2 stereo LINE  
(31, 33) inputs and 1 stereo PHONO/LINE (36) input. The PHONO/  
LINE (35) switch enables you to set the (36) input to Phono or Line.  
The phono inputs will accept only turntables with a magnetic  
Page 3  
 
1. Unscrew the outside FADER PLATE SCREWS (B). Do  
not touch the INSIDE SCREWS (C).  
to adjust the headphone volume without effecting the overall mix. By  
sliding the CUE PGM PAN (22) control to the left you will be able to  
monitor the assigned cue signal. Sliding 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.  
10. DISPLAY: The peak hold, dual function DISPLAY (27) indicates either  
the MASTER (38) output left and right levels or the channel 2 and  
channel 3 levels. You can choose the option you want by pressing the  
DISPLAY (28) button.  
4. Screw the fader to the mixer.  
NOTE: When the DISPLAY (27) is in the channel 2/channel 3  
display mode, by adjusting the individual channel gain and  
tone 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.  
Specifications  
INPUTS:  
5. BPM DISPLAY: There are BPM DISPLAYS (23, 24) for Channel 2  
and Channel 3. They update approximately every 2.5 seconds and  
digitally display the Beats Per Minute allowing you to match the beats  
visually. BPM DISPLAY (23) reflects the Beats Per Minute of Channel  
2, and BPM DISPLAY (24) reflects the Beats Per Minute of Channel  
3.  
DJ Mic....................................................1.5mV 2Kohm unbalanced  
Phono.........................................................................3mV 47Kohm  
Line.......................................................................150 mV 27Kohm  
OUTPUTS:  
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/Booth......................................................0 dB 775mV 400ohm  
Max..............................24V Peak to Peak  
Rec...........................................................................225mV 5Kohm  
GENERAL:  
6. The BEAT OFFSET INDICATORS (25) 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 2 and Channel 3 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.  
Low...........................................................................+ 12/-26dB  
Mid............................................................................+ 12/-26dB  
High..........................................................................+ 12/-26dB  
Gain (Mic)........................................................................0 to -40dB  
Gain (Chnls 1-3)..............................................................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.............................................115/230V 50/60Hz 15W  
Dimensions.................................10" x 12" x 4 7/16" (254 x 305 x 112 mm)  
Weight........................................................................6.5 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.  
7. OUTPUT CONTROL SECTION: The level of the AMP OUT (38) is  
controlled by the MASTER (18) control. The BALANCE (17) control  
will allow the Amp Out signal to be balanced between the left and  
right speakers. The BOOTH (16) control adjusts the level of the  
BOOTH OUTPUT (39). 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.  
NOTE: The RECORD OUT (40) 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  
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 (19) button is pushed, the  
TALKOVER INDICATOR will glow and the volume of all sources  
except the Mic or whatever is connected to the PHONO/LINE (36)  
input are reduced by -16 dB.  
9. CUE SECTION: By connecting a set of headphones to the  
HEADPHONE (4) jack, you can monitor any or all of the channels.  
Select the correct CUE (21) button or buttons and their respective  
CUE LED (29) indicators will glow. Use the CUE LEVEL (20) control  
Page 4  
 
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 011-331-5559-0470 • Fax 011-331-5559-0485  
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: 011-44-170-5591-771 • Fax: 011-44-170-5593-533  
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  
 

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