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:________________________
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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
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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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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.
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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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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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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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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.
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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 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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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
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BLOCK DIAGRAM...
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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:
Telephone: +1 (401) 295-9000
+1 (401) 295-5200
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