Numark Industries DJ Equipment DM900EX User Manual

Professional Disc Jockey Products  
DM900EX  
OWNER’S MANUAL  
NUMARK INDUSTRIES  
11 Helmsman Road, North Kingstown, RI 02852  
 
DM9 0 0 EX  
NUMARK DM900 STEREO MIXER  
INDEX  
Introduction  
Features  
Page 2  
Safety Information  
Product Registration  
Page 4  
Precautions  
Page 5  
Page 6  
Front Panel Diagram  
Rear Panel Diagram  
Guided Tour of Features  
Operating Instructions  
Page 7  
Connection Diagram  
Specifications  
Page 9  
Page 10  
Page 11  
Page 12  
Block Diagram  
Warranty and Service  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 8 Num ark Indus t rie s  
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DM9 0 0 EX  
5. Water and Moisture - This product should be  
kept away from direct contact with liquids.  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
6. Heat - Avoid placing this product too close to  
any high heat sources such as radiators.  
7. Power Sources - This product should be  
connected to a power supply only of the type  
described in these operating instructions, or as  
marked on the unit.  
CAUTION: TO REDUCE THE RISK OF ELECTRIC  
SHOCK DO NOT REMOVE ANY COVER. NO USER-  
SERVICEABLE PARTS INSIDE. REFER SERVICING TO  
QUALIFIED SERVICE PERSONNEL ONLY.  
The lightning flash with arrowhead symbol within the  
equilateral triangle is intended to alert the user to the presence  
of un-insulated “dangerous voltage” within the product’s  
enclosure that may be of sufficient magnitude to constitute  
a risk of electric shock to persons.  
The exclamation point within the equilateral triangle is intended  
to alert the user to the presence of important operating and  
maintenance (servicing) instructions in the literature  
accompanying this appliance.  
8. Power Cord Protection - Power supply  
cords should be routed so that they are not likely to  
be walked upon or pinched by items placed on or  
against them. When removing the cord from a  
power outlet be sure to remove it by holding the  
plug attachment and not by pulling on the cord.  
9. Object and Liquid Entry - Take care that  
objects do not fall into and that liquids are not  
spilled into the inside of the mixer.  
CAUTION  
FOR USA & CANADIAN MODELS ONLY  
10. Damage Requiring Service - This product  
should be serviced only by qualified personnel. If  
you have any questions about service please  
contact Numark at the number(s) shown on the  
back cover of this manual.  
TO PREVENT ELECTRIC SHOCK DO NOT USE THIS  
(POLARIZED) PLUG WITH AN EXTENSION CORD,  
RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN  
BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.  
11. Grounding or Polarization - Precautions  
should be taken so that the grounding or  
polarization means built into the mixer is not  
defeated.  
SAFETY INSTRUCTIONS  
1. Read Instructions - All the safety and operating  
instructions should be read before this product is  
connected and used.  
NOTE: This apparatus does not exceed the  
Class A/Class B (whichever is applicable) limits for  
radio noise emissions from digital apparatus as set  
out in the radio interference regulations of the  
Canadian Department of Communications.  
2. Retain Instructions - The safety and operating  
instructions should be kept for future reference.  
3. Heed Warnings - All warnings on this product and in  
these operating instructions should be followed.  
WARNING: To reduce the risk of fire or electric  
shock, do not expose this appliance to rain or  
moisture. Electrical equipment should NEVER be  
kept or stored in damp environments.  
4. Follow Instructions - All operating and other  
instructions should be followed.  
Please record the serial number of your unit as shown on the back of the chassis as well as the name of  
the dealer from whom you purchased the unit. Retain this information for your records. Please return the  
warranty card enclosed to register your mixer with us.  
MODEL: DM900  
PURCHASED FROM:_________________________  
SERIAL NUMBER:__________________ DATE OF PURCHASE:________________________  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 8 Num ark Indus t rie s  
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DM9 0 0 EX  
IMPORTANT INFORMATION...  
Please read this entire manual before  
connecting the DM900 to your system.  
For optimum performance:  
SYSTEM PRECAUTIONS  
• Always make sure that AC power is OFF while  
making any connections.  
• Use appropriate cables throughout your system:  
Quality shielded audio cables and terminated  
shielded video cables, low-capacitance preferred.  
Speaker cables must be 14-gauge minimum; 12- or  
10-gauge is better.  
• Do not use excessively long cables (i.e. over  
50ft/14m) Be sure plugs and jacks are tightly  
mated. Loose connections can cause hum, noise or  
intermittents that could easily damage your  
speakers.  
• Reliability will be enhanced through the use of  
banana connectors on the speaker wires. Observe  
correct speaker wire polarity. If in doubt, consult  
your Numark dealer or a qualified technician.  
• Never use spray cleaners on the slide controls.  
Residues cause excessive dirt build-up and this  
will void your warranty. In normal use slide controls  
can last for many years. If they malfunction (usually  
because of a dirty or dusty environment) consult a  
professional technician.  
• Take care to connect only one cable at a time. Pay  
attention to the color-coded, labelled Input and  
Output jacks.  
• ALWAYS remember: “TURN AMPS ON LAST  
AND OFF FIRST”. Begin with master faders or  
volume controls on minimum and the amplifier  
gain/input control(s) down. Wait 8 to 10 seconds  
before turning up the volume. This prevents  
transients which may cause severe speaker  
damage.  
• Never attempt to make any adjustments or repairs  
other than those described in this manual. Take the  
DM900 to your dealer or to an authorized Numark  
Service Center.  
• Use restraint when operating controls. Try to  
move them slowly. Rapid adjustments could  
damage speakers due to amplifier clipping.  
A NOTE ON CABLES:  
Make the input and output  
connections with readily available  
low-capacitance stereo cables.  
Quality cable makes a big difference  
in audio fidelity and punch. See your  
Numark dealer or an electronics or  
audio specialist store if you are not  
sure which cables to get.  
Avoid amplifier “clipping” at all costs: this  
occurs when the red LEDs (usually on the front  
panel of most professional power amplifiers) start  
flashing. “Clipping” is when the power amplifier is  
distorting and working beyond it’s limits. Amplifier  
distortion is THE major cause of speaker failure.  
• To prevent fire or shock hazard, do not expose  
the unit to rain or moisture. Never place cans of  
beer, soda, glasses of water or anything wet  
on top of the mixer!  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 8 Num ark Indus t rie s  
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DM9 0 0 EX  
DM9 0 0 EX FRONT PANEL DIAGRAM...  
8
1
7
5
6
2
2
3
3
4
DM9 0 0 EX REAR PANEL DIAGRAM...  
5
5
2
1
6
4
3
4
3
7
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 8 Num ark Indus t rie s  
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DM9 0 0 EX  
GUIDED TOUR OF FEATURES AND OPERATING INSTRUCTIONS...  
CROSSFADER SECTION  
If the DM900 is your first mixer, please read this entire  
4. The Replaceable Crossfader achieves clean  
manual before you begin operation.  
segues between the two input channels.  
If you are an experienced DJ, simply replace your old  
mixer. The DM900 can be rack-mounted or used as a  
free-standing unit (four 6" rack unit spaces).  
"Hard left" selects Channel 1. "Hard right" selects  
Channel 2. With the crossfader centered both assigned  
channels are live. Use the crossfader for fast and  
seamless segues from one selected channel to the  
other.  
INSTALLATION AND OPERATION  
Note: The crossfader is user replaceable in case of  
failure. Simply unscrew the two large screws which hold  
it in place, lift it out and disconnect it’s cable. Re-attach  
the new crossfader and screw the mounting plate back  
onto the unit - you’re back in business!  
Study the Connections Diagram on page 13. First,  
connect all stereo input sources. Next connect your  
monitor headphones. Make sure all faders are at "zero"  
and the unit is off. Finally, connect the stereo outputs to  
the power amplifier(s) and/or audio sources. Plug the  
DM900 into it’s power supply and plug this into power.  
Now you are ready to switch it on.  
MONITOR SECTION  
5. Channel Cue Assign. The Cue selector is used  
to route channel audio to the Monitor Section. The  
channel faders do not control the Cue volume.  
1. Power Switch and Power-On LED.  
The DM900 is divided into five functional blocks:  
Input, Crossfader, Monitoring, and Master Output. It is  
important to learn how each of these work.  
6. Headphone Volume controls the output level to  
the Headphone Jack located on the front panel of  
the mixer. Connect headphones with a standard 1/4"  
stereo plug. The Cue audio is sent to the headphone  
amp using the Cue Assign Selector.  
CHANNEL INPUTS SECTION  
2. Channels 1 & 2 Input Toggle Switches select  
which source will be live to that channel based on what  
you have connected to the rear panel input section.  
MASTER OUTPUT SECTION  
7. The Stereo Master Fader controls the Master  
output level.  
3. The Input Faders are low-noise, low-impedance,  
high-quality, smooth Alps™ faders. These control  
individual source levels in the mix.  
8. The LED METER indicates the Master output level.  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 8 Num ark Indus t rie s  
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DM9 0 0 EX  
REAR PANEL: INPUTS AND OUTPUTS  
(Please refer to diagram on page 7)  
1. Power Input. Plug your external power supply into  
here. See safety precautions on page 3 for proper  
treatment of the power cord.  
5. Line/Phono Input switch. Use this to allow line  
level equipment to be plugged into your phono inputs  
giving you a total of 8 line input options.  
2. GND is the grounding lug for all turntables. Always  
use this connection (your turntable cable should have a  
grounding wire).  
6. The Tape Outputs are low-impedance unbalanced  
RCA jacks which output the program mix and allow you  
to connect any recording device.  
3. Phono Inputs on Channels 1, 2 and 3 use  
unbalanced RCA jacks. Your input signal is fed directly  
to the DM900's high-quality RIAA phono pre-amplifiers  
so use this position only for moving magnet cartridges.  
Line level sources will overload the sensitive phono pre-  
amps and will sound very bad, so always be sure to  
toggle the line/phono switch over to line before  
connection of line sources.  
7. The Stereo Master Outputs are low-impedance  
RCA connectors controlled by the Master fader.  
4. Channels 1 & 2 Line Inputs are unbalanced  
RCA jacks. The Line Input is selected with the toggle  
switch on the front panel.  
You can connect stereo audio from HiFi VCRs, cassette  
and reel-to-reel tape decks, DAT machines, CD players,  
laser discs, tuners, even synthesizers or other mixing  
consoles.  
NOTE: Plug mono audio sources into both Left and  
Right inputs using a “Y” cable connector.  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 8 Num ark Indus t rie s  
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DM9 0 0 EX  
DM9 0 0 EX CONNECTION DIAGRAM...  
Turnt able 2  
Turnt able 1  
Turnt able 3  
CD Pla ye r  
Po we r  
Supply  
Ma in  
Tape Deck  
Sound Syst e m  
w/ Am p lifie r  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 8 Num ark Indus t rie s  
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DM9 0 0 EX  
SPECIFICATIONS...  
INPUTS:  
Line:  
47kWinput impedance  
100mV rms sensitivity (for 1.22 V output)  
Phono: 47kWinput impedance  
1.5 mV rms sensitivity @ 1 KHz (for 1.22 V output)  
OUTPUTS:  
Line:  
7.2V rms max (+19 dBm)  
Headphone Amp: .5 watt into 47W  
Distortion less than .01%  
SIGNAL TO NOISE RATIOS (vs. maximum output):  
Line:  
Better than 88 dB  
Phono: Better than 78 dB  
FREQUENCY RESPONSE:  
Line:  
20 Hz- 20k Hz +_ .5 dB  
Phono: +_ 1 dB except for controlled attenuation of -3 dB  
@ 20 Hz to reduce rumble and feedback  
POWER CONSUMPTION:  
8 Watt typical, 10 watt with full headphone output  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 8 Num ark Indus t rie s  
1 0  
 
DM9 0 0 EX  
BLOCK DIAGRAM...  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 8 Num ark Indus t rie s  
1 1  
 
Professional Disc Jockey Products  
Wa rra n t y a n d Se rv ic e In fo rm a t io n  
Numark Industries, LLC and Numark International, Inc. (hereafter “Numark”) warrants each  
new product manufactured and/or supplied by it to be free from defects in material or  
workmanship under conditions of normal use and service for 360 days, beginning on the date of  
purchase from an authorized Numark Dealer, but not to exceed 2 years from date of shipment by  
Numark.  
The Numark obligation under this warranty is limited to repairing or replacing, at its option,  
the product or part(s) therein; which upon examination by Numark shall appear to be defective  
or not up to factory specifications; providing the Numark product is returned (transportation  
prepaid) to Numark.  
Numark shall not be liable for any damages, consequential or otherwise, resulting from the  
use and operation of this product and makes no other warranty(s) either express or implied on  
this product, including any warranty of merchantability.  
This warranty does not extend to any of our products which have been subjected to  
misuse, neglect, accident, incorrect wiring not our own, improper installation, or use in violation of  
instructions furnished by us, nor extended to units which have been repaired or altered outside  
of our factory, nor to cases where the serial number thereof has been removed, defaced, or  
changed, nor to accessories used therewith not of our own manufacture. Numark reserves the  
right to make changes or improvements in its products, during subsequent production, without  
incurring the obligation to install such changes or improvements on previously manufactured  
equipment.  
To place this warranty into effect, the enclosed WARRANTY REGISTRATION CARD must  
be returned to Numark Industries, LLC within thirty (30) days after date of purchase.  
This warranty gives you specific legal rights, and you may also have other rights which  
vary from state to state.  
Some states do not allow the exclusion or limitation of incidental or consequential damages  
so the above limitation or exclusion may not apply to you.  
EQUIPMENT TRANSPORT  
A Return Authorization number should be obtained from Numark through the addresses or  
phone numbers below.  
It is the customer’s obligation, when returning faulty equipment, to properly pack the Numark  
equipment in its original packaging. Failure to do so may inadequately protect the equipment in  
transit and, therefore, jeopardize the customer’s warranty. The defective Numark equipment  
should be sent, FREIGHT PREPAID with Return Authorization number to:  
NUMARK INDUSTRIES  
11 Helmsman Road  
T e l e p h o n e : + 1 ( 4 0 1 ) 9 4 6 - 4 7 0 0  
North Kingstown, RI 02852 U.S.A.  
Attention: Service Department  
Fax:  
E-mail:  
+ 1 ( 4 0 1 ) 9 4 6 - 5 3 5 0  
 

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