Numark Industries Musical Instrument DM1685 User Manual

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.  
0
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
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  
 

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