Professional Disc Jockey Products
DM1720X STEREO MIXER
OWNER’S MANUAL
NUMARK INDUSTRIES
11 Helmsman Road, North Kingstown RI 02852
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DM1 7 2 0 X
NUMARK DM1720X
STEREO MIXER
INDEX
Safety Information
Page 2
Product Registration
Introduction and Features
Precautions
Page 4
Page 5
Page 6
Page 8
Page 9
Page 9
Page 10
Page 11
Page 12
Front Panel Diagram
Rear Panel Diagram
Connection Instructions
Connection Diagram
Specifications
Block Diagram
Warranty and Service
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DM1 7 2 0 X
CONGRATULATIONS!
You have purchased the DM1720X 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 DM1720X 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.
• Neutrik™ “Combo” connector allows 1/4” or XLR plug
to be used for DJ Mic.
• 3 Phono and 5 Line inputs.
• Pushbutton Cueing with PFL (pre-fader listen) on each channel.
• Headphone monitoring with PFL/Program cross-fader.
• Master and Zone outputs.
• Stereo/Mono switch on the Master and Zones.
• Tape Out for direct recording.
• Powerful stereo headphone output.
• High-end performance audio signal.
• 12V BNC light connector.
As a s p e c ia l b o n u s w e h a ve
in c lu d e d a r ig h t a n g le h e a d p h o n e
a d a p te r w ith th is m ixe r .
J u s t p lu g yo u r h e a d p h o n e s in to
th e a d a p te r a n d th e n p lu g th e
a d a p te r in to yo u r m ixe r .
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DM1 7 2 0 X
IMPORTANT INFORMATION...
Please read this entire manual before connecting the DM1720X to your system.
SYSTEM PRECAUTIONS
For optimum performance:
• 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.
• 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
• 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.
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.
• Never attempt to make any adjustments or repairs
other than those described in this manual. Take the
DM1720X 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. 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.
• 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!
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DM1 7 2 0 X
DM1 7 2 0 X FRONT PANEL DIAGRAM...
4
1
2 0
2 1
1 8
2
1 9
3
5
6
1 7
1 5
7
1 6
8
1 0
1 2
9
1 3
1 4
1 1
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. 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.
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 (19) 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 7 2 0 X
9. The Crossfader In/Out Pushbutton defeats the
entire Crossfader function but leaves the Kill functions
active.
15. Master Level. This controls overall output level. Note
that you can select (18) whether you want stereo or mono.
16. 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.
10. The replaceable Crossfader achieves clean segues
between two selected input channels.
11. The Crossfader Channel Assign switches determine
which channels the crossfader will segue between.
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.
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.
17. The Stereo/Mono Toggle Switches allow you to select
either stereo or mono output.
18. 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.
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.
19. 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.
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. 12V BNC Connector allows a 12 volt gooseneck style
“Numark” light to be connected directly to the mixer.
21. The Power button turns the unit on and off. Make sure
your input faders (7) are turned down before you power up
your mixer.
13. The Headphone Level control sets the volume in your
headphones.
14. The Headphone Jack accepts a 1/4” plug and is set on
the front of the unit.
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DM1 7 2 0 X
DM1 7 2 0 X REAR PANEL DIAGRAM...
1
1 1
4
3
2
7
7 7
9
7
9
7
9
5
6
1 0
1. GND is the grounding lug for turntables 1, 2 and 3
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.
(phono inputs on Channels 1, 2 and 3). Always use this
connection (your turntable cable should have a grounding
wire).
2. The Stereo Main Outputs are low-impedance RCA
connectors controlled by the Master fader.
NOTE: Plug mono audio sources into both Left and
3. The Tape Outputs are low-impedance unbalanced
RCA jacks which output the program mix and allow you to
connect any recording device.
Right inputs using a “Y” cable connector.
9. Phono Inputs on Channels 1, 2 and 3 use
unbalanced RCA jacks. Your input signal is fed directly to
the DM1720X'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.
4. The Stereo Zone Outputs are low-impedance
unbalanced RCA jacks controlled by the Zone Level
controls.
5. Mic is the mic input for the Mic Channel.
10. AC Cord. See safety precautions on page 3 for
6. Mic is the mic input for the Mic on Channel 4.
proper treatment of the power cord.
11. Voltage Selector. Set this for the appropriate
voltage in your area
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Inst ruct ions for Connect ion....
1. Be sure the POWER 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.
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 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.
7. The OUTPUT MASTER jacks on the rear of the unit are for connecting to the amplifier.
DM1 7 2 0 X CONNECTION DIAGRAM...
Tape
Zone 1
Sound Syst e m
w/ Am p lifie r
Tape
Turnt able 1
AC
Out le
Microphone
Turnt able 2
Tape Deck 2
Ma in
Sound Syst e m
w/ Am p lifie r
Dua l CD Pla ye r
Turnt able 3
CD Pla ye r
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SPECIFICATIONS...
INPUTS:
Line:
47kWinput impedance
78mV rms sensitivity (for 1.22 V output)
10kWinput impedance balanced/unbalanced
3 mV rms sensitivity (unbalanced for 1.22 V output)
1.5 mV rms sensitivity (balanced for 1.22 V output)
80 mV rms max input (unbalanced)
Mic:
40 mV rms max input (balanced)
Phono:
47kWinput impedance
1.2 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 87 dB
Better than 86 dB
Better than 86 dB
Mic:
Phono:
FREQUENCY RESPONSE:
Mic:
20 Hz- 20k Hz +_ .5 dB
Line:
20 Hz- 22k 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 -14 dB
POWER CONSUMPTION:
18 Watt typical
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DM1 7 2 0 X
BLOCK DIAGRAM...
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Professional Disc Jockey Products
Warranty and Service Information
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
Attention: Service Department
Telephone:
Fax:
E-mail: [email protected]
+1 (401) 295-9000
+1 (401) 295-5200
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