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
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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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