Numark Industries DJ Equipment DM 1820X User Manual

Professional Disc Jockey Products  
DM 1820X STEREO MIXER  
OWNER’S MANUAL  
NUMARK INDUSTRIES  
11 Helmsman Road, North Kingstown RI 02852  
 
DM1 8 2 0 X  
6. Heat - Avoid placing this product too close to  
any high heat sources such as radiators.  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
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.  
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.  
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.  
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.  
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.  
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.  
CAUTION  
FOR USA & CANADIAN MODELS ONLY  
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.  
S AFETY INS TRUCTIONS  
12. Internal/External Voltage Selectors - Internal  
or external voltage selector switches, if any,  
should only be reset and re-equipped with a  
proper plug for alternative voltage by a qualified  
service technician. Do not attempt to alter this  
yourself.  
1. Read Instructions - All the safety and operating  
instructions should be read before this product is  
connected and used.  
2. Retain Instructions - The safety and operating  
instructions should be kept for future reference.  
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.  
3. Heed Warnings - All warnings on this product and in  
these operating instructions should be followed.  
4. Follow Instructions - All operating and other  
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.  
5. Water and Moisture - This product should be kept  
away from direct contact with liquids.  
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: DM1820X  
PURCHASED FROM:_________________________  
SERIAL NUMBER:__________________ DATE OF PURCHASE:________________________  
Numark - The Prove n Le ade r in DJ Te chnology  
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DM1 8 2 0 X  
NUMARK DM1820X STEREO MIXER  
INDEX  
Safety Information  
Page 3  
Product Registration  
Introduction and Features  
Precautions  
Page 5  
Page 7  
Front Panel Diagram  
Rear Panel Diagram  
Connection Instructions  
Connection Diagram  
Specifications  
Page 8  
Page 11  
Page 12  
Page 13  
Page 14  
Page 15  
Page 16  
Block Diagram  
Warranty and Service  
Numark - The Prove n Le ade r in DJ Te chnology  
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DM1 8 2 0 X  
CONGRATULATIONS!  
You have purchased the DM 1820X Stereo Mixer by Numark. This equipment features  
all new circuitry and the latest in manufacturing and design technology to give you  
greater quality and better reliability than ever before. The DM 1820X Preamp Mixer  
has been designed by DJs for DJs. It gives you all of the controls and features you need  
in a professional piece of equipment to show off the best of your skills.  
Thank you for buying Numark DJ products!  
FEATURES...  
• User replaceable assignable ALPs™ crossfader .  
• Bass, Mid,Treble,and Gain controls on every input channel.  
• Left<->Right Pan control on each channel and the DJ Mic.  
• Bass, Mid & Treble “KILL” switches for special effects and  
creative mixing.  
Neutrik™ “Combo” connector allows 1/4” or XLR plug  
to be used for DJ Mic.  
• 8 line inputs.  
• Three phono inputs switchable to line level.  
• Processor Loop circuit for easily hooking up external effects.  
• Pushbutton Cueing with PFL (pre-fader listen) on each channel.  
• Headphone monitoring with PFL/Program cross-fader.  
• Master and 2 Zone outputs.  
• Stereo/Mono switch on the Master and Zones.  
• Balanced Outputs.  
• Tape Out for direct recording.  
• Powerful stereo headphone output.  
• High-end performance audio signal.  
• 12V BNC light connector.  
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DM 1 8 2 0 X  
As a special bonus we have  
included a right angle headhpone  
adapter with this mixer.  
Just plug your headphones into  
the adapter and then plug the  
adapter into your mixer.  
Numark - The Prove n Le ade r in DJ Te chnology  
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DM1 8 2 0 X  
IMPORTANT INFORMATION...  
Please read this entire manual before connecting the DM1820X to your system.  
For optimum performance:  
SYSTEM PRECAUTIONS  
• 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.  
• 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.  
• Always make sure that AC power is OFF  
while making any connections.  
• 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.  
• 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.  
• Use restraint when operating controls. Try to  
move them slowly. Rapid adjustments could  
damage speakers due to amplifier clipping.  
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.  
• Never attempt to make any adjustments or  
repairs other than those described in this  
manual. Take the DM1820X to your dealer or to  
an authorized Numark Service Center.  
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. Use balanced connections  
whenever possible. See your Numark  
dealer or an electronics or audio  
specialist store if you are not sure which  
cables to get.  
• 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!  
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DM 1 8 2 0 X  
DM1 8 2 0 X FRONT PANEL DIAGRAM...  
2 2  
2 1  
2 3  
1
1 9  
2 0  
2
3
4
5
6
7
1 8  
1 6  
1 7  
8
1 1  
1 2  
1 3  
1 4  
9
1 0  
1 5  
1. Channel Input Gain/Trim/Attenuation Controls.  
These control the sensitivity of the inputs for Channels 1-4.  
Use these whenever a particular source causes overload of  
the preamp inputs. Attenuation range is 0dB to -20dB. Use  
these with the PFL (pre-fader listen) monitor when cueing.  
5. DJ Mic Talkover Switch. When engaged this mutes  
your music sources from channels 1-4. Releasing it brings  
you immediately back to full source level. It is very useful  
for announcements.  
6. Channels 1 - 4 Input Toggle Switches select which  
source will be live to that channel based on what you have  
connected to the rear panel input section.  
2. Treble, Middle and Bass Controls fine tune the tone  
of your music through the sound system. Note that these  
are also available on the DJ Mic.  
7. The Input Faders are low-noise, low-impedance, high-  
quality, smooth faders. These control individual source  
levels in the mix.  
3. Use the Pan Control to maximize the Left or Right side of  
your Source.  
4. Send button will send the individual channel signal to the  
send jack on the rear panel. This is used to route to an  
external effects unit. The signal comes back in from the  
effects unit through any line input channel you select and is  
then sent out to your amplifier through the Master Output  
jacks on the rear panel.  
8. Channel Cue Assign/PFL pushbuttons are used to  
route channel audio to the Monitor Section. The channel  
input faders do not control the Cue volume. When the Cue  
button is pushed you get Pre Fader Listen(PFL). In addition,  
when these buttons are depressed the third row of the LED  
meter (20) will display the signal level of that channel on a  
PFL basis. The level can be adjusted by using the Gain  
control(1).  
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DM1 8 2 0 X  
9. The Crossfader In/Out Pushbutton defeats the  
entire Crossfader function but leaves the Kill functions  
active.  
leaving the other frequencies playing. This area is always  
active even when the crossfader is not. Try that for a neat  
effect, or mix one channel’s treble with another channel’s  
bass (by cutting the mid and bass on the first channel and  
the treble and mid on the other channel.)  
10. Crossfader/Kill Assign Switches lets you choose  
which input channel will be heard when the Crossfader is  
moved to the left or right and affected by the Kill function.  
16. Master Level. This controls overall output level. Note  
that you can select (18) whether you want stereo or mono.  
11. The replaceable Crossfader achieves clean segues  
between two selected input channels.  
17. The Zone Levels control speaker volume for other outputs  
such as control booth monitors, a tape deck, another  
amplifier, a sub-woofer, another mixer or a satellite speaker  
system. Note that you can select (18) whether you want  
stereo or mono.  
1 2 3 4  
1 2 3 4  
In this example, Channel 1 is selected on the Left and  
Channel 3 is selected on the Right. With the Crossfader  
centered both assigned channels are live. Use the  
Crossfader for fast and seamless segues from one channel  
to the next.  
CONTRACTOR'S NOTE: Zone Level provides zone  
control in installations where there are two separate rooms  
(eg: a bar and a dance floor). The “Zone” volume should be  
controlled from the mixer not from the amplifier.  
18. The Stereo/Mono Toggle Switches allow you to select  
Note: the crossfader is user replaceable. Simply unscrew  
the two large screws which hold it in place, lift it out, and  
disconnect its cable. Reattach the new crossfader and  
screw it back onto the unit - you’re back in business!  
REPLACEMENT CROSSFADERS can be purchased from  
your local Numark Dealer, or by calling Numark Industries.  
either stereo or mono output.  
19. Stereo Auto Peak Hold Level Meter. The red LEDs  
for +3, +5 and +8dB hold program peaks for an instant.  
With peak metering, it's OK to be "in the red" as long as +5  
or +8dB isn't constantly lit. Set crossover, equalizer and  
power amplifier inputs to avoid distortion at each step in the  
audio chain. Proper attention to the peak meters results in  
the punchiest possible sound without audible distortion.  
12. The Split Cue Level controls what signal is being  
monitored through your headphones. Move the slide control  
to the left and you will hear your source music from the  
channel(s) selected with the cue/PFL switch. Move the  
control to the right and you will hear your program mix, or  
output. The slide control allows fast and frequent  
headphone monitoring.  
20. PFL Meter. When the Cue/PFL switches are depressed  
this meter tracks pre-fader listen (PFL) signal for the  
channel selected instead of the mixer’s output level.  
21. 12V BNC Connector allows a 12 volt gooseneck style  
13. The Headphone Level control sets the volume in your  
“Numark” light to be connected directly to the mixer.  
headphones.  
22. The Power button turns the unit on and off. Make sure  
your input faders (7) are turned down before you power up  
your mixer.  
14. The Headphone Jack accepts a 1/4” plug and is set on  
the front of the unit.  
15. Kill Switches and LEDs have been provided for Treble,  
Mid and Bass Control on each side of the crossfader. This  
allows you to mute that frequency’s audio output while  
23. The Mic Jack is a Neutrik™ “Combo Jack” and  
allows connection of either a 1/4” jack or an XLR jack. This  
is ideal for connecting an XLR Gooseneck directly.  
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DM 1 8 2 0 X  
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DM1 8 2 0 X  
DM1 8 2 0 X REAR PANEL DIAGRAM...  
1 1  
8
8
1 2  
6
1 0  
1
4
2
3 5  
7 7 7 9 7 9 7  
9
1. The Balanced Main Outputs are low-impedance  
8. 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.  
XLR type connectors controlled by the Master fader.  
2. The Stereo Main Outputs are low-impedance RCA  
connectors controlled by the Master fader.  
9. Phono Inputs on Channels 1, 2 and 3 use  
unbalanced RCA jacks. Your input signal is fed directly to  
the DM1820X's high-quality RIAA phono preamplifiers so  
use this position only for moving magnet cartridges. Line  
level sources will overload the sensitive phono preamps  
and will sound very bad, so always be sure to toggle the  
line/phono switch over to line before connection of line  
sources.  
3. The Tape Outputs are low-impedance unbalanced  
RCA jacks which output the program mix and allow you to  
connect any recording device.  
4. The Stereo Zone Outputs are low-impedance  
unbalanced RCA jacks controlled by the Zone Level  
controls.  
10. AC Cord. See safety precautions on page 3 for  
5. The Send can be attached to an external effects  
proper treatment of the power cord.  
processor such as a sampler.  
11. Voltage Selector. Set this for the appropriate  
6. Mic is the mic input for the Mic Channel and Channel 4.  
voltage in your area  
7. Channels 1-5 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.  
12. GND is the grounding lug for turntables 1, 2 and 3  
(phono inputs on Channels 1, 2 and 3). Always use this  
connection (your turntable cable should have a grounding  
wire).  
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  
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DM 1 8 2 0 X  
Instructions for Connection....  
1. Be sure the POWER (22) is OFF. All connections should be made before the unit is turned on. Always remember  
“Turn Amps on last and off first!”  
2. Use appropriate cables throughout your system: quality shielded audio cables, low capacitance preferred. Speaker  
cable must be 14-gauge minimum; 12- or 10-gauge is better.  
3. Connect your music sources on the rear of the unit. Up to 3 phono and 8 line sources (CD players, cassette decks,  
tuners, etc.) can be connected. When connecting to an input with a phono/line option switch remember to set the  
switch accordingly.  
4. Connect the ground wire from your turntables (and any other sources that come with a ground) to the ground post on  
the rear panel. This will eliminate most common hum and feedback problems.  
5. Connect your DJ mic on the front left side of the unit (23) or on the back of the unit at Mic 1. Connect your second mic  
at Mic 2 on the back of the unit.  
6. Connect your headphones on the front right side of the unit at (14).  
7. The OUTPUT MASTER jacks on the rear of the unit are for connecting to the amplifier. Use the balanced outputs if  
possible. Make sure you correctly attach the right and left cables to avoid phasing problems.  
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DM1 8 2 0 X  
DM1 8 2 0 X CONNECTION DIAGRAM...  
Tape Deck  
Zone 1  
Sound Syst e m  
w/ Am p lifie r  
Sa m p ling  
Keyboard  
Turnt able 1  
Zone 2  
Sound Syst e m  
w/ Am p lifie r  
AC  
Out le t  
Microphone s  
Turnt able 2  
Turnt able 3  
Tape Deck  
Ma in  
Sound Syst e m  
w/ Am p lifie r  
Dua l CD Pla ye r  
CD Pla ye r  
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DM 1 8 2 0 X  
SPECIFICATIONS...  
INPUTS:  
Line:  
10kWinput impedance  
100 mV rms sensitivity (for 1.22 V output)  
10kWinput impedance balanced/unbalanced  
3 mV rms sensitivity (for 1.22 V output)  
50 mV rms max input  
Mic:  
Phono:  
47kWinput impedance  
1.5 mV rms sensitivity @ 1 KHz (for 1.22 V output)  
OUTPUTS:  
Line:  
9V rms max (+20 dBm)  
Headphone Amp: 5 watt into 47W  
Distortion less than .01%  
SIGNAL TO NOISE RATIOS (vs. maximum output):  
Line:  
Better than 82 dB  
Better than 75 dB  
Better than 75 dB  
Mic:  
Phono:  
FREQUENCY RESPONSE:  
Mic:  
20 Hz- 15k Hz +_ .5 dB  
Line:  
20 Hz- 20k Hz +_ .5 dB  
Phono:  
+_ 1 dB except for controlled attenuation of -3 dB  
@ 20 Hz to reduce rumble and feedback  
CHANNEL EQ:  
Bass:  
±15db @80Hz  
Middle:  
Treble:  
±10db @1KHz  
±15db @12.5KHz  
TALKOVER ATTENUATION:  
Variable from no cut to -16 dB  
KILL EFFECTS:  
Bass: -54dB at 50 Hz, -3dB at 400 Hz  
Middle: -44dB at 1k Hz, -3dB at 200Hz  
Treble: -53dB at 15k Hz, -3dB at 2k Hz  
POWER CONSUMPTION:  
20 Watt typical, 28 watt with full headphone output  
Numark - The Prove n Le ade r in DJ Te chnology  
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DM1 8 2 0 X  
BLOCK DIAGRAM...  
Numark - The Prove n Le ade r in DJ Te chnology  
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Professional Disc Jockey Products  
Wa r r a n t y a n d Se r v ic e In f o r m 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  
North Kingstown, RI 02852 USA Fax:  
Attention: Service Department E-mail: [email protected]  
Telephone: +1 (401) 295-9000  
+1 (401) 295-5200  
 

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