Professional Disc Jockey Products
DM1685 STEREO MIXER
with Digital Sampler
OWNER’S MANUAL
NUMARK INDUSTRIES
11 Helmsman Road, North Kingstown RI 02852
DM1 6 8 5
NUMARK DM1685 STEREO MIXER
INDEX
Safety Information
Product Registration
Page 2
Page 4
Introduction
Features
Precautions
Page 5
Page 6
Page 7
Front Panel Diagram
Guided Tour of Features
Operating Instructions
Sampler Operating Instructions
Rear Panel Diagram
Connection Diagram
Specifications
Page 10
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 1685 Stereo Mixer by Numark. This equipment features
all new multi-source Beatkeeper technology. With the latest in manufacturing and design
technology you get greater quality and better reliability than ever before. The DM 1685
brings to you the finest quality of DJ mixing equipment available today.
Thank you for buying Numark DJ products!
DM1 6 8 5 FEATURES...
Mixer features include:
• User replaceable assignable ALPs™ crossfader .
• Dual 6-band graphic equalizer with In/Out switch.
• Master and Zone level controls
• Neutrik™ “Combo” connector allows 1/4” or XLR plug to be used for DJ Mic.
• 5-8 switchable line inputs
• Three phono inputs.
• Dedicated DJ Mic and Second Mic Channel with 2 Band EQ and Talk-over
dual control
• Split cue headphone monitoring with cross-fader
• Master and Zone level controls
• Stereo/Mono switch on the Master and Zone
• Tape Out for direct recording.
• Powerful stereo headphone output
• Push button cueing
• High-end performance audio signal
• 12V BNC light connector
Digital Sampler features:
• Advanced Digital Processor by “Analog
Devices” and DRAM memory provides
true 16-bit CD quality audio and powerful
recording, editing and playback options.
• Re-triggering for stuttering “rap”-style
effects.
•Digital processor modes:
-Edit (allows Intro and/or Outro trimming of the
sample after it is recorded).
-Single (sample plays once).
-Repeat (loops sample until disengaged).
-Stutter (for "stutters" and "stabs" in single or
repeat mode).
• Effect Level Fader.
• Large Start-Stop button.
-Speed Control (plays sample faster or slower
than originally recorded resulting in frequency shift).
-Monitor (for monitoring sample with or without
program or cue audio output).
-Write (safely record a sample).
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IMPORTANT INFORMATION...
Please read this entire manual before
connecting the DM1685 to your system.
For optimum performance:
SYSTEM PRECAUTIONS
• Use appropriate cables throughout your
system: Quality shielded audio cables and
terminated shielded video cables, low-
• Always make sure that AC power is OFF while
making any connections.
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
DM1685 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!
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DM 1685 FRONT PANEL DIAGRAM...
1 7
2 0
8
2 1
1 8
1 6
1 4
2 5
1 2
1 0
1
2
1 1
2 6
1 3
2 8
2 7
8
2 9
4
3
3 0
3 1
3 2
6
5
7
1 5
1 9
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GUIDED TOUR OF FEATURES AND OPERATING INSTRUCTIONS...
If the DM1685 is your first mixer, please read this entire
4. Effect Send (Channels 1-4). Depress these
manual before you begin operation.
buttons when you want the signal from any input
channel to be routed to the Sampler and the Send Out
Jacks on the rear panel. The channel faders do not
affect the signal levels which are routed to the send
output.
If you are an experienced DJ simply replace your old
mixer. The DM1685 can be rack-mounted or used as a
free-standing unit (five 19" rack unit spaces).
CROSSFADER SECTION
INSTALLATION AND OPERATION
5. The Crossfader Assign knob to the left of the
crossfader lets you choose which input channel will be
heard when the crossfader is in the far left position.
Study the Connections Diagram on page 13. First,
connect all stereo input sources. Next connect your
microphone(s) and 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 Off1 2 3 4
sources. Plug the DM1685 into AC power. Now you
are ready to switch it on.
Off1 2 3 4
The DM1685 is divided into six functional blocks:
Input, Crossfader, DJ Mic, Master/Zone Output,
Equalizer, and Sampler. It is important to learn how
each of these work.
6. The Replaceable Crossfader achieves clean
segues between the two selected input channels.
"Hard left" selects the channel set up of the Assign
Left knob. In this example it is Channel 1. "Hard right"
selects the channel set up on the Assign Right
knob. In this example it is Channel 4. With the
crossfader centered both assigned channels are live.
Use the crossfader for fast and seamless segues from
one selected channel to the other. To turn off the
crossfader simply turn both knobs all the way to the
left.
CHANNEL INPUTS/CONTROLS SECTION
1. Channels 1, 2, 3 & 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. The Input Faders are low-noise, low-impedance,
high-quality, smooth Alps™ faders. These control
individual source levels in the mix.
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!
3. Channel Cue Assign. The Cue pushbuttons are
used to route channel audio to the Monitor Section.
The channel faders do not control the Cue send
volume.
7. The Crossfader Assign knob to the right of the
crossfader lets you choose which input channel will be
heard when the crossfader is in the far right position.
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DJ MIC SECTION
MASTER/BOOTH OUTPUT SECTION
The DM1685 has an extremely flexible DJ Mic
channel. The Talkover function reduces the level of
the music while leaving the DJ Mic at normal volume.
13. The Stereo Master Fader controls the overall
output level.
14. Stereo/Mono toggle adjusts the Master
8. Neutrik™ “Combo” connector allows connection of
either a 1/4” jack or an XLR jack. This is ideal for
connecting an XLR gooseneck directly into the mixer.
output for the operation selected.
15. The Zone Level controls speaker volume for a
remote zone or booth monitors. If you do not use
booth monitors the output can feed a tape deck,
another amplifier, another mixer or a satellite speaker
system. Note: This can also be used to supply line
level audio to a lighting controller or to lights that are
sound activated.
9. Treble and Bass Controls fine tune the tone of
your voice on both mics through the sound system. The
controls are detented for setting tone "flat". For best
results, use a dynamic cardioid microphone.
10. The DJ Mic 1 Fader controls the DJ Mic volume
for the Neutrik™ “Combo” connector.
CONTRACTOR'S NOTE: Booth Level provides
zone control in installations where there are two
separate rooms, or a bar and dance floor, for example.
Remote zone volume should be controlled from the
DM1685.
11. The Mic 2 Fader controls the Mic volume for the
1/4” connector on the rear of the mixer.
12.Mic Off/On/Talkover Switch.
Off turns off Mic 1
16. Stereo Auto Peak Hold Level Indicator.
This fast, accurate stereo meter tracks the output
level. The red LEDs for +3dB, +5dB and +8dB hold
program peaks for a second or two. With peak
metering, it's OK to be "in the red" as long as +5dB or
+8dB aren't constantly lit. Set the crossover, equalizer
and power amp inputs to avoid distortion at each step
in the audio chain. Proper attention to the peak meter
results in the punchiest possible sound without
audible distortion.
O n turns on Mic 1
Talkover turns down the input level of your music
sources from Channels 1-4.
Talkover is very useful for making announcements
without adjusting any levels.
Try using this feature for audience participation
when you want the music to temporarily cease
and the audience to be heard - “YEAH!”
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EQUALIZER SECTION
17. 6-Band Stereo Graphic Equalizer (EQ).
EQ compensates for differences in source material
sound quality. In ultra-compact mobile systems this EQ
can be used to tailor the sound to the acoustical
requirements of the room. Center frequencies are
42Hz, 152Hz, 480Hz, 1.5kHz, 4.8kHz and 15.4kHz.
Faders have a center detent for an accurate "flat”
response.
GENERAL EQ HINTS
• Boost the 42Hz band for deep bass tones and solid
kick drum sound. Use sparingly because this
dramatically increases demand on power amplifiers and
could drive them into “clipping” (see page 6).
• Cut slightly at 152Hz and more at 460Hz for extra
clarity. Note: Cutting is preferable to boosting.
• Boost 15kHz for a little "sizzle".
Below is a typical "house" EQ curve. Notice how the
knobs above "0" balance out the knobs below. Start
with this setting if you've never used a graphic EQ
before:
• As a general rule, less equalization is better!
18. Equalizer On/Off. This controls whether your
final output will be routed through the EQ or not.
MONITOR SECTION
19. The Monitor section includes the Program Mix
control, the Headphone Volume control and the
Headphone Jack. Connect headphones with a
standard 1/4" stereo plug. The Cue audio is sent to the
headphone amp using the Cue Assign Pushbutton
and the Pgm Mix control. The Program Mix controls
the amount of program audio in the headphones so that
beats can be matched exactly and segues are smooth
when a song is cued.
Below is an example of a poor EQ curve because it cuts
the output volume down by 6-10dB. You have to
compensate by running the Master output higher:
0
Below is the worst sort of curve to use because you are
using EQ to add volume. With exaggerated boost you
can easily run your power amplifiers into “clipping” (see
page 5) and damage your speakers.
20. 12V BNC Connector allows a 12 volt gooseneck
lamp to be connected directly to the mixer. This light is
readily available from your Numark dealer.
21. Power Switch and Power-On LED.
0
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DIGITAL SAMPLER SECTION
TO RECORD A SAMPLE
The Sampler uses dynamic RAM with a 16-bit
microprocessor controller. The same digital signal
processing components used in professional audio
equipment deliver CD-quality samples.
a - Press the Write button once to go into stand by
mode. The red LED will go on.
b - Select the bank (or multiple banks) into which you
want to record. Any bank can be selected. Each
bank contains 3 seconds of recording time. If you
want to record a longer sample select multiple
banks (they must be adjoining). To playback a
multi-bank sample you must reselect the same
banks later. Note: To overwrite an existing
sample, select that bank instead of an empty bank.
Changing bank selection at this point in time is
possible and will not destroy any previously
recorded samples.
25. The Mode Pushbuttons switch from effect to
effect. The accompanying LEDs illuminate to show you
which specific mode you are in at any time.
Modes are:
• Repeat sets the unit to play back a sample and
automatically repeat (loop) when it gets to the end of
the sample.
e - Hit the Start-Stop button to begin recording. It's
• Single sets the unit to play back a sample once.
red LED will light.
• Edit sets the unit to sample edit. This activates the
Intro and Outro editing controls as described in
#26. Edit can be used at the same time as Single
and Repeat so that editing of the sample can be
done while your program output is playing on the
dance floor.
f - Hit Start-Stop a second time to stop the sampling,
or allow the memory banks to fill up, at which time
sampling will stop automatically. Once your writing is
complete the sampler will automatically switch to
Single playback mode and light the Single LED.
The sampler is now ready for playback.
• Write sets the unit to sampler record ready.
Depress the appropriate send button to select the
source you wish to record. Selecting a bank you
wish to record to and hit the Start/Stop button
(#30) to begin recording (it is safer to actually choose
your bank before going to write mode so that you
don't accidentally wipe out an existing sample). The
LED will stay lit while you are in Write mode. After
you are done writing your sample you should select
a play mode (either Single or Loop) and listen to your
sample - note that you must do this manually by
hitting the correct Mode Pushbutton.
26. Intro and Outro editing controls are used when
Edit mode is selected to fine tune the beginning
(Intro) or ending (Outro) of your samples. These
"trim" the unwanted sound while in Single or
Repeat playback modes. Turn the controls inward
to trim more - return them to their full outside
position to return to your full sample. Once trimmed
turn Edit off to lock-in your settings, now every
time you select the sample it will be the perfect
length. Note: Trimmed samples are not erased -
they can be heard again by going back into Edit
and undoing the trim. This powerful new feature
allows you to start a sample early or end it late and
still trim it to the perfect length without having to re-
record. Since these controls can be active while the
sample is "live", you can even fine tune samples on
the fly. A way of efficiently trimming samples is by
engaging the Stutter button and repeatedly
hitting the Start-Stop button as you adjust the
Intro knob.
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27. The Speed Control plays samples faster or
slower resulting in a pitch shift of the sample. In the
center position, the sample is played at recorded speed.
Moving the knob to the left will slow down playback by up
to 50%; moving the knob to the right will speed up the
playback by up to 200%. Positions near the center
provide fine changes in playback speed. Positions
further from the center detent provide more drastic
changes in playback speed.
• In Single or Repeat play with Trigger
you are ready to "stab" samples. With the
Trigger Out, the sample plays all the way
through before you can play it again. With it In,
you can stab or stutter a sample. When you
shout "Rock it - rock the house!" and sample it,
it can be played back as -
R-R-R-R-R-R-R-Rock --
Rock-Rock-Rock it - Rock it Rock it -
Rock - - Rock it - rock the house!
28. Effect Level Mix fader. This precisely sets the
audible level of the sample in the mix.
by simply "drumming" with your fingers.
29. Memory Bank Select Pushbuttons A-D.
Four banks are available for storing samples. To record a
bank go to Write and then hit the bank button. You can
record into any combination of banks by pressing
multiple bank buttons.
31. The Stutter Pushbutton lets you choose
between two playback styles, Trigger and Non-
Trigger, when in Single or Repeat modes.
• When the Stutter is Out and the sampler is
set to Single or Repeat mode, each time you
tap the Start-Stop button the sample starts to
play. The next tap stops sample playback. The
next time play starts, the sample re-starts at the
beginning.
After sampling, you can either select the next bank and
record it (remember Write is still on, just select the bank
and hit Start/Stop) or you can manually select a playback
mode.
You can play any combination of the Memory Banks from
left to right (that is, Memory Bank B will always play before
Memory Bank D - but you can play ABCD; BC; BD: ACD;
only C; only D; etc.).
• When the Stutter is In and the sampler is set
to Single or Repeat mode, each time you tap
the Start-Stop button the sample re-triggers.
30. The large Start-Stop button controls sample
recording and sample playback. The small red Effects
Indicator LED glows when the sampler is "on". Here are
the functions:
ABOUT STUTTERING
Expensive studio rack-mount samplers and
sampling keyboards can re-trigger or stutter. This
means "beginning at the start of the sample each
time a key is pressed or a drum pad is struck".
• Tap the button when in sampler Write mode to
begin sampling (the LED will light). Tapping it again
ends the sample and the LED goes out. (unless
the sampler has run out of memory and shuts off
automatically - Once the Effects Indicator LED
goes out, the Write LED goes out and the Single
LED turns on.
Re-triggering creates the stuttering "rap" effect.
The DM1685/1885 includes a manual
stuttering feature. How fast can you tap? Try
using two fingers for increased speed.
32. Monitor Pushbutton. To hear the sample or
effect in the headphones, press this button.
Program Mix still works and you will be able to
hear any other input channels with the Cue
buttons activated.
• In single or repeat play without Trigger, tap the
button to play the sample and tap it again to stop
the playback. Every time you play the sample, the
music starts from the beginning of the sample.
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DM1685 REAR PANEL DIAGRAM
1 0
8
8
1
2
7
7
7
9
7
9
7
9
4
5
3
6
REAR PANEL: INPUTS AND OUTPUTS
7. Channels 1-5 Line Inputs are unbalanced RCA
jacks. The Line Input is selected with the toggle switch
on the front panel.
1. AC Cord. See safety precautions on page 2 for proper
treatment of the power cord.
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.
2. 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
3. The Stereo Main Outputs are low-impedance RCA
inputs using a “Y” cable connector.
connectors controlled by the Master fader.
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.
4. The Stereo Zone Outputs are low-impedance
unbalanced RCA jacks controlled by the Zone Level
control.
9. Phono Inputs on Channels 1, 2 and 3 use
unbalanced RCA jacks. Your input signal is fed directly to
the DM1685'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.
5. The Tape Outputs are low-impedance unbalanced
RCA jacks which output the program mix and allow you to
connect any recording device.
6. The Send output is for send to an external signal
processor such as an external sampler or effects box.
You direct sound to the send by pressing the send button
on the main panel.
10. Mic 2 is the mic input for mic 2.
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DM1 6 8 5 CONNECTION DIAGRAM...
Microphone 2
Keyboard
Turnt able 1
Dig it a l Sa m p le r
Tape Deck
AC
Out le t
Zone
Tape Deck
Sound Syst e m
w/ Am p lifie r
CD Pla ye r
Turnt able 2
Ma in
Turnt able 3
Sound Syst e m
w/ Am p lifie r
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SPECIFICATIONS...
INPUTS:
Line:
10kWinput impedance
80 mV rms sensitivity (for 1.22 V output)
Mic: 10kWinput impedance balanced/unbalanced
2.5 mV rms sensitivity (for 1.22 V output)
500 mV rms max input
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%
EQUALIZER:
6-Band Stereo Graphic EQ
Band centers 42 Hz, 152 Hz, 480Hz, 1.52KHz, 4.8KHz, 15.36KHz +/- 15 dB
SIGNAL TO NOISE RATIOS (vs. maximum output):
Line:
Mic:
Phono:
Better than 85 dB
Better than 72 dB
Better than 83 dB
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
TALKOVER ATTENUATION:
variable from no cut to -16 dB
POWER CONSUMPTION:
20 Watt typical, 28 watt with full headphone output
SAMPLER:
FREQUENCY RESPONSE AND SAMPLING RATE:
Variable sampling rate 44.1 kHz with 16-bit sampling yields 20Hz-22 kHz.
MAXIMUM MEMORY TIME:
12 seconds
Note: Features and Specifications Subject to Change without Notice
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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 Kingston, RI 02852 USA
Attention: Service Department
Telephone: +1 (401) 295-9000
Fax: +1 (401) 295-5200
E-mail: [email protected]
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