Numark Industries Music Mixer DM 1835X User Manual

Professional Disc Jockey Products  
DM 1835X STEREO MIXER  
OWNER’S MANUAL  
NUMARK INDUSTRIES  
11 Helmsman Road, North Kingstown RI 02852  
 
DM1 8 3 5 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: DM1835X  
PURCHASED FROM:_________________________  
SERIAL NUMBER:__________________ DATE OF PURCHASE:________________________  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
3
 
DM1 8 3 5 X  
NUMARK DM1835X STEREO MIXER  
INDEX  
Safety Information  
Page 3  
Product Registration  
Introduction and Features  
Precautions  
Page 5  
Page 7  
Front Panel Diagram  
Beatkeeper Diagram  
Beatkeeper Operation  
Rear Panel Diagram  
Connection Instructions and Diagram  
Specifications  
Page 8  
Page 10  
Page 11  
Page 16  
Page 17  
Page 18  
Page 19  
Page 20  
Block Diagram  
Warranty and Service  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
4
 
DM1 8 3 5 X  
CONGRATULATIONS!  
You have purchased the DM1835X Stereo Mixer by Numark. This equipment features  
all new multi-source Beatkeeper technology. With all new circuitry and the latest in  
manufacturing and design technology you get greater quality and better reliability than  
ever before. TheDM1835X 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.  
Sends on each channel for easily hooking up external effects.  
Pushbutton Cueing with PFL (pre-fader listen) on each channel.  
Headphone monitoring with PFL/Program 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.  
theBEATKEEPER Features:  
Automatic BPM tracking of up to 8 input sources (4 simultaneously)  
Accurate digital BPM displays  
Visual live tracking of your mix progress, using Tempo Difference  
and Beat Offset Bar Graphs  
All visual displays update on every beat  
Sync Lock Button for accurate BPM tracking  
Beat Assist for locking to the correct beat  
Simple user interface  
Once you've synced your Beatkeeper you've opened a whole new dimension in mixing.  
The Beatkeeper has two bar graphs - one showing the tempo difference, and the other showing  
the beat offset. Now you can see when your mix is on track. If the beats start to drift, you'll be  
able to easily adjust the music before your audience can hear it. No other beat counter or  
automatic mixer can give you the power to make a more accurate mix.  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
5
 
DM 1 8 3 5 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  
© 1 9 9 7 Num ark Indus t rie s  
6
 
DM1 8 3 5 X  
IMPORTANT INFORMATION...  
Please read this entire manual before connecting the DM1835X 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 DM1835X 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!  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
7
 
DM 1 8 3 5 X  
DM1 8 3 5 X FRONT PANEL DIAGRAM...  
2 3  
2 2  
2 1  
1
1 9  
2 0  
1 7  
2
4
3
5
6
1 8  
1 6  
7
8
1 2  
1 3  
1 1  
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 Switchhen 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).  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
8
 
DM1 8 3 5 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 Cue Crossfader 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.  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
9
 
DM 1 8 3 5 X  
theBEATKEEPER  
Panel Diagram  
H
I
F
G
A. CHANNEL SELECT-  
Tap this button to select desired input channel. The respective  
input channel LED will light up 1,2,3,or 4  
E
B. SYNC LOCK BUTTON-  
A
When an input is scanning for the correct tempo, tapping the  
Sync Lock button once will lock in the current BPM as long as  
there is a BPM number displayed for the input. When an input is  
locked in tapping the Sync Lock button tells the Beatkeeper to  
start scanning for a new tempo again.  
C
B
D
C. SYNC LOCK LED  
OFF- the respective input is not locked or set to track the music  
ON- the respective input is synced and ready to track the music  
G. PEAK SOUND LED (green)  
D. BEAT ASSIST BUTTON-  
OFF- the Beatkeeper is not detecting sound from the respective  
audio input  
Tapping the Beat Assist button once automatically realigns the  
downbeat to exactly when you tapped the button. Tapping the  
beat assist button two or more times also sets the tempo and  
sync locks the music.  
BLINKING- the Beatkeeper is detecting 'rhythm setting'  
sounds from the respective audio input  
E. BPM DISPLAY-  
H. TEMPO DIFFERENCE GRAPH  
OFF- One or Both of the audio inputs are not yet sync locked in  
RED LED ON- The audio inputs tempos are not aligned  
YELLOW LED ON- The audio inputs tempos are close to  
aligned  
When no number is displayed the audio signal is still being  
processed for this input or the Beatkeeper is not recieving any  
information for this input  
(NUMBER DISPLAYED)- The respective input is currently  
playing music with this number of Beats Per Minute (as  
determined by the Beatkeeper)  
GREEN LED ON- The audio inputs tempos are perfectly  
aligned  
F. DOWN BEAT LED (red)  
I. BEAT OFFSET GRAPH  
OFF- the Beatkeeper has not yet matched the beat of the  
respective audio input  
OFF- one or both of the audio inputs are not yet sync locked or  
are not sending an audio signal  
BLINKING- the Beatkeeper has matched this LED to the beat  
of the respective audio input  
RED LED ON- the audio inputs beats are not aligned  
YELLOW LED ON- the audio inputs beats are close to aligned  
GREEN LED ON- the audio inputs beats are perfectly aligned  
ON- the Beatkeeper is waiting for the music to start on the  
respective input  
Numark - The Prove n Le ade r in DJ Te chnology  
1 0  
© 1 9 9 7 Num ark Indus t rie s  
 
DM1 8 3 5 X  
BEATKEEPER OPERATION  
After syncing an audio input, try speeding up and slowing  
down the music. You'll notice that the red beat LED will  
continue to flash on the downbeat, and the BPM number  
will adjust itself to match the tempo of the music. This  
indicates that the Beatkeeper is successfully tracking the  
beat and will continue to do so throughout your mix. If you  
stop the music you will notice the Beat LED will go solid and  
the BPM number will remain in memory. Once the music is  
restarted the Beatkeeper will remember the last tracked  
rhythm pattern and pick up on the beat right away.  
Channel Selection  
When your mixer is first turned on the channels selected  
will be 1 & 2 respectively. If you wish to track the beat of  
another channel, tap on the channel select button until the  
desired input is reached.  
NOTE: The Beatkeeper will track the source that is  
selected with the channel toggle switch.  
PLAY the music, OBSERVE the beat match, and  
PRESS the Sync Lock Button. That's it. If you can do  
that twice, you can mix with the Beatkeeper.  
Syncing Your Beatkeeper  
When learning how to use the Beatkeeper, choose  
some dance music with a hard, steady beat.  
Start the music for left channel of your  
Beatkeeper. When the Beatkeeper has located the  
beat, the BPM display will illuminate with the music's Beats  
Per Minute.  
Beat Assist  
The Beatkeeper is foolproof. The Beatkeeper can track  
any music up to 199 beats per minute. The unit, however,  
is set to automatically track tempos between 80-150BPM.  
Of course not all music is within this range, you may need to  
track the high tempos of Meringue or Salsa, or the low  
tempos of R&B slow jams or Reggae. Let's face it, not all  
music has hard steady beats either and sometimes you just  
need the music set up yesterday For these occasions we  
have the Beat Assist Button.  
You'll notice a flashing green LED every time the  
Beatkeeper detects a rhythm defining instrument. The  
Beatkeeper will soon flash a red LED on every beat, the  
same way you would tap your foot to the beat of the music.  
The Beatkeeper will display a BPM which will update every  
five-seconds while scanning. As long as the beat is well-  
defined the BPM number will equal the beats per minute of  
the song being played. Once you see the red beat  
LED flashing with the beat of the music, press  
the respective Sync Lock button, and the Sync  
Lock LED will illuminate.  
If the Beatkeeper is having trouble matching  
the beat to the flashing red Beat LED, or if you  
need to sync up Immediately, tap the Beat Assist  
button 2-8 times as you hear the beat, the same  
way you would tap your feet to the music.  
Pressing the Beat Assist Button more than once aligns the  
Beatkeeper to your taps. Notice that the Sync Lock LED  
automatically illuminates, signifying that the Beatkeeper is  
now locked in with the beat. Simply put, if the Beatkeeper  
isn't on track, or you're in a real hurry, you need to press a  
button twice instead of once.  
Activating the Sync Lock tells the Beatkeeper to stop  
scanning the music for a different BPM and to start tracking  
the beat changes of the current BPM as you adjust the  
pitch of the music. This function is manual to ensure that  
the Beatkeeper is right on the beat. Once the Sync  
Lock LED is on, the Beatkeeper tracks the  
beats of the music and updates the BPM display  
on every beat.  
If the Beatkeeper is synced to the correct BPM  
but is aligned to the music's offbeat, tap the  
Beat Assist button with the beat of the music  
just once and you will have brought the Beatkeeper back  
in sync.  
To unlock, simply tap the Sync Lock button once and  
the Beatkeeper is back in BPM scanning mode.  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
1 1  
 
DM 1 8 3 5 X  
2 Channel Mixing  
If the opposite is true, the Tempo Difference Graph has a  
red LED illuminated on the left channel, indicating the song  
on the left channel is faster than that the right channel,  
either slow down the left channel, or speed up the right  
channel.The second step involves the bottom graph, the  
Beat Offset Graph. This graph indicates how close the  
individual beats are. Both BPMs may be the same but the  
beats may not be in sync. This is often described as the  
“ping-pong” effect. If the beats are matched, the green  
LED in the middle lights up. If the beats of one input are  
earlier than beats of the other input, the Beat Offset Graph  
will shift toward the song with the earlier beats.  
After you feel comfortable syncing up the Beatkeeper,  
you're ready to mix. Mixing with the Beatkeeper  
has three parts: syncing to the music (which  
you've done), aligning the tempos, and aligning  
the beats. Once these three things are done, you will  
have a perfect mix. No more guessing, tapping, or  
embarrassing fades.  
Choose another music selection and start it on your right  
channel. Sync up the first song as described in the last  
section. With the first selection synced (Sync Lock LED  
illuminated), sync up the right channel the same  
way you set up the left.  
To align the Beat Offset Graph when using CD  
Players, adjust the appropriate pitch bend. If  
you are using turntables, hold or apply pressure  
to the record/turntable and then release to  
“shift” the beat.  
As the second Sync Lock LED illuminates, a  
new dimension of DJing begins: VISUAL  
MIXING.  
If the Beat Offset graph is shifted toward the right channel  
either use the minus (“-”) pitch bend for the right channel  
CD player (with vinyl, apply pressure to slow the turntable)  
or use the plus (“+”) pitch bend for the left channel CD  
player (with vinyl push the turntable ahead).  
The bar graphs on the top of the Beatkeeper  
have now been activated and are updating  
automatically.  
NOTE: In order to perform a mix which is tracked by the  
Beatkeeper, both channels MUST be synced. This is  
indicated by the yellow Sync Lock LED being lit for both  
inputs.  
Intuitively, if either bar graph is shifted towards a channel,  
this indicates that the song on that channel is “ahead” of  
the other one. Either the tempo is faster (top graph), or the  
beats come sooner (bottom graph).  
In order to create the perfect mix, your goal is  
to keep both bar graphs as close to centered  
(green or yellow) as possible.  
When both bar graphs are in the green you are  
ready to perform your mix!  
First, align the top graph, the Tempo Difference Graph.  
This graph indicates how close the two BPMs are to each  
other. If they are exactly the same tempo, the green LED in  
the middle will light up. If one song is faster than the other,  
the bar graph will shift towards the faster song. If the  
Tempo Difference graph is not centered, adjust  
the speed of one of the inputs using the pitch  
control. For example, if the Tempo Difference graph has  
a red LED illuminated closer to the right channel of the  
Beatkeeper, the right channel is faster than the left  
channel, either slow down the right channel, or speed up  
the left channel.  
Don’t forget you can always resync to the beat, if it ever  
shifts off, by tapping the Beat Assist button.  
If the beats start to drift, you'll be able to easily adjust the  
music before your audience can hear it. No other beat  
counter or automatic mixer can give you the power to make  
a more accurate mix!  
NOTE: The Beat Offset bar graph either indicates beat-  
to-beat offset, or beat-to-halfbeat offset, whichever is  
closer. This allows the DJ the option of mixing on the beat  
or on the half beat.  
Numark - The Prove n Le ade r in DJ Te chnology  
1 2  
© 1 9 9 7 Num ark Indus t rie s  
 
DM1 8 3 5 X  
Multiple Channel Mixing  
Prepping For A Mix  
One exciting feature of your Beatkeeper built into your  
mixer is the option to visually beat mix more than 2 sources  
at the same time. Once you have synced a channel of the  
Beatkeeper the unit will continue to track it even if you  
should decide to change channels. Up to all four channels  
can be in sync simultaneously. By selecting different  
channels you can cross-compare the mix of any 2 channels  
instantly.  
You may also choose to prep the Beatkeeper for an  
actual mix. To prep the Beatkeeper, first match the two  
song's tempos by adjusting the pitch so that the Tempo  
Difference LED graph displays yellow or green LEDs. Next  
hit the Cue button of your CD player, or lift your record  
needle. The red “beat” LED will remain solid alerting you to  
which input is ready to start. When the music starts again,  
the Beatkeeper begins right on the beat and indicates how  
well the two songs are synced within seconds.  
In order do perform a 3-way mix you first will  
need to set up a 2-way mix as described in the  
previous section.  
Syncing To Off Beats  
NOTE: Multiple source or “layer” mixes should be  
performed with a minimum of vocals otherwise the music  
will clash when mixed for a long period of time.  
The next step will be to decide which input channel you  
would like to use as a reference for beat mixing. While  
your 2-way mix is ongoing change the channel,  
on the side you have not chosen as a reference, to the  
next song you plan to mix into. Now sync and mix this  
song like you did for the 2-way mix. After you have  
synced up the new song you should continue to check  
your original mix by switching between channels. When  
you have properly aligned the new song you are ready to  
perform a 3-way mix.  
Now if you really want to be fancy, you can actually use  
the Beatkeeper to sync to the off- beats. You can have two  
songs going “Boom - Cha - Boom - Cha”. Normally, you  
would sync the “Booms” of both songs (beat-to-beat  
mixing). But you can also sync the “Boom” of one song to  
the “Cha” of the other (beat-to-half beat mixing). The  
Beatkeeper’s Beat Offset graph will display whichever  
offset is smaller. This allows the DJ the flexibility to mix with  
the beat or the off-beat.  
To perform a 4-way mix just do the same thing again.  
Beat mixing is a skill that must be practiced in order to be proficient at it. 3  
and 4-way mixing can be a very difficult skill to master. Visual mixing with  
the Beatkeeper gives you the tools to help you do this, but nothing  
replaces practice.  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
1 3  
 
DM 1 8 3 5 X  
BEATKEEPER TROUBLESHOOTING  
T5 The BPM display is correct, but the beat LED  
isn't flashing on the downbeats of the music.  
If this happens tap the Sync Lock button (turning the  
Sync Lock LED on) and tap the Beat Assist button once to  
make the Beatkeeper track the downbeat. You can also use  
this to force the Beatkeeper to track an offbeat for more  
advanced mixing.  
T1 The BPM goes way off when using the search  
button on my high tech CD mixer.  
Some high tech CD mixers have a cueing feature which  
allows you to cue precisely to an exact spot in the music so  
you can slam mix. The only problem is that this mode repeats  
the first beat of the music at a rate which is unrelated to the  
actual BPM of the music. As a result, the BPM goes off track.  
The best way to avoid this is to restart the music after a  
search, make sure the Beatkeeper is resynced to the music  
and then press the Cue button on the CD player. The  
Beatkeeper will remember the BPM and track the music  
once it starts.  
Alternatively you may sync manually by tapping the  
Beat Assist button 2 or more times on the beat.  
T6 The Beats per minute number seems to jump  
all over the place.  
The Beatkeeper is analyzing different sections of the  
music to find the BPM. If there is a temporary suspension of  
a distinct beat or if the rhythm is too complex, this number  
may not follow the actual BPM.  
T2 The Beatkeeper doesn't resync to the  
downbeat of the music when the music restarts.  
Either the downbeat isn't strong enough to be  
a) You can wait for a passage of music with a steady  
beat for a more accurate BPM indication.  
b) Hit the Sync Lock button once the red beat LED  
starts following the beat  
detected, or the music was started well before a strong  
downbeat. You can easily resync to the downbeat by  
tapping the Beat Assist button once with the beat.  
Alternatively you can cue the music to a strong downbeat so  
that the Beatkeeper starts on this downbeat.  
or c) Tap the Beat Assist button at least twice along  
with the music beat.  
Either method (b or c) will cause the Sync Lock LED to  
turn and lock on, indicating that the Beatkeeper is now  
tracking the music.  
T4 Either the BPM display is blank, or it is  
noticeably off.  
This is common at the beginnings of songs where the  
beat is not well defined. To sync simply tap the Beat Assist  
button two or more consecutive times on the downbeat.  
The Sync Lock LED turns on automatically, indicating that  
the Beatkeeper is now tracking the beat of the music.  
T7 It takes too long for the Beatkeeper to find  
the beat on its own.  
To speed up the BPM detection process, tap the Beat  
Assist button at least twice. At this point, the Beatkeeper wi  
turn on the Sync Lock LED, immediately providing a BPM  
estimate, while resynchronizing to the beat you tapped.  
Numark - The Prove n Le ade r in DJ Te chnology  
1 4  
© 1 9 9 7 Num ark Indus t rie s  
 
DM1 8 3 5 X  
T8 I hit the Sync Lock button, but the flashing  
red beat LED doesn't seem to follow the beat.  
This means you hit the Sync Lock button before the  
red beat LED actually started tracking the tempo. You can  
easily fix this by tapping the Beat Assist buttons as many  
times as necessary to resync to the beat of the music.  
T12 Neither the Tempo Difference graph or the  
Beat Offset graph seem to work.  
The bar graphs are only operational when both Sync  
Lock LEDs are illuminated. This ensures that you don't  
inadvertently try to mix two songs without their tempos  
being synced.  
To make the bar graphs operational, either:  
a) Wait for the red beat LED’s to follow the music and tap  
the respective Sync Lock button  
T9 The beat tracking suddenly gets off track.  
This may happen if the music has several beats  
missing, or the rhythm suddenly becomes extremely  
complex or variable. You can either resync the beat using  
the Beat Assist button or wait a few seconds for the  
Beatkeeper to automatically recover.  
or b) Tap the Beat Assist button twice with the beat of  
the music.  
Either method will cause the Sync Lock LED to  
illuminate.  
T10 The Beatkeeper seems to track the music for  
a little bit right after using the Beat Assist, and  
then drifts off.  
T13 The Beat Offset graph is not illuminated, bu  
the Tempo Difference graph is.  
This indicates that one or both of the inputs are not  
playing. The Beat Offset graph turns off when there are no  
beats available for tracking on either or both inputs. The  
graph automatically restarts once both inputs become active  
again.  
This could be one of two things:  
a) The Beatkeeper is averaging the time between each  
of your Beat Assist button taps. If the first tap is way off, the  
tempo will be way off.  
b) The Beatkeeper was synced during a section of the  
music without a well defined beat.  
T14 The Beat Offset graph has the green LED  
illuminated when the red beat LEDs are a half  
beat off from each other.  
In either case, the problem can be overcome by waiting  
a few seconds before preceding to tap the Beat Assist  
button two or more times with the beat of the music.  
This indicates that the songs are synced at their half  
beats. With rap music and some house, mixing is often don  
on the half beats rather than the down beats themselves.  
The Beatkeeper intentionally syncs this way to give the DJ  
the option of beat-to-beat mixing or beat-to-halfbeat mixing  
T11 Either the BPM number or red beat LED  
doesn't track the music fast enough while using  
the pitch bend on my CD player (or speed control  
on my record player).  
You may have exceeded the tracking capability of the  
Beatkeeper. The Beatkeeper can normally handle speed  
changes of +/- 5% per beat if the music's rhythm is steady. If  
the rhythm is complex (or some of the beats are missing) the  
Beatkeeper will require more gradual changes to track  
properly.  
* If you are using a record player or a wide range pitch  
bend on a CD player, note that the Beatkeeper only tracks  
+/- 11.5% from the tempo at which it was synced. You may  
need to resync the Beatkeeper if you exceed this range  
while attempting to align tempos.  
* You can also manually resync the beat using the Beat  
Assist button.  
Numark - The Prove n Le ade r in DJ Te chnology  
1 5  
© 1 9 9 7 Num ark Indus t rie s  
 
DM 1 8 3 5 X  
DM1 8 3 5 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 XLR  
8. Line/Phono Input switch. Use this to allow line leve  
equipment to be plugged into your phono inputs giving you  
a total of 8 line input options.  
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 th  
DM1835X'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 prope  
treatment of the power cord.  
5. The Send can be attached to an external effects  
processor such as a sampler.  
11. Voltage Selector. Set this for the appropriate  
voltage in your area  
6. Mic is the mic input for the Mic Channel and Channel 4.  
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).  
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.  
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  
1 6  
© 1 9 9 7 Num ark Indus t rie s  
 
DM1 8 3 5 X  
DM1835X Instructions for Connection and 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  
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 a  
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.  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
1 7  
 
DM 1 8 3 5 X  
SPECIFICATIONS...  
INPUTS:  
BEATKEEPER:  
Sync Lock Mode  
BPM update rate :  
Line: 10kWinput impedance  
100 mV rms sensitivity (for 1.22 V output)  
Every beat  
+/- 1 BPM  
Mic:  
10kWinput impedance balanced/unbalanced  
3 mV rms sensitivity (for 1.22 V output)  
50 mV rms max input  
BPM accuracy :  
BPM tracking range :  
Bar graph update rate :  
50-199BPM  
Every beat  
Phono:47kWinput impedance  
1.5 mV rms sensitivity @ 1 KHz (for 1.22 V  
output)  
Tempo difference graph resolution:  
+/-1 BPM per LED, green is +/-2 BPM  
Beat offset graph resolution:  
+/-7.5msec per LED, green is +/-15msec  
OUTPUTS:  
Line: 9V rms max (+20 dBm)  
Headphone Amp: 5 watt into 47W  
Distortion less than .01%  
Beat Assist Button  
Minimum time between consecutive taps: 0.3 seconds  
Maximum time between consecutive taps: 1.2 seconds  
Consecutive taps averaging for BPM : Last 2 to 8 taps  
SIGNAL TO NOISE RATIOS  
(vs. maximum output):  
Line: Better than 82 dB  
Mic:  
Better than 75 dB  
Phono:Better than 75 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  
CHANNEL EQ:  
Bass: ±15db @80Hz  
Middle:±10db @1KHz  
Treble: ±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  
© 1 9 9 7 Num ark Indus t rie s  
1 8  
 
DM1 8 3 5 X  
BLOCK DIAGRAM...  
Numark - The Prove n Le ade r in DJ Te chnology  
© 1 9 9 7 Num ark Indus t rie s  
1 9  
 
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  
Telephone: +1 (401) 295-9000  
North Kingstown, RI 02852 USA  
Attention: Service Department  
Fax:  
E-mail:  
+1 (401) 295-5200  
 

Milwaukee Impact Driver 2310 21P User Manual
Mr Coffee Coffee Grinder BMLD User Manual
Multiquip Portable Generator DCA125USI User Manual
Nikon Microscope Magnifier 44100 User Manual
Niles Audio Home Theater System CS12V User Manual
Nokia Cell Phone Accessories CA 100 User Manual
Nokia Network Router A032 User Manual
Nokia Projector VT45K User Manual
Parker Hannifin Home Security System 88 021610 01G User Manual
Parkside Soldering Gun PLP 100 A1 User Manual