Professional Disc Jockey Products
DM 1835X STEREO MIXER
OWNER’S MANUAL
NUMARK INDUSTRIES
11 Helmsman Road, North Kingstown RI 02852
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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:________________________
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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
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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
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•
•
•
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.
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As a special bonus we have
included a right angle headhpone
adapter with this mixer.
Just plug your headphones into
the adapter and then plug the
adapter into your mixer.
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IMPORTANT INFORMATION...
Please read this entire manual before connecting the 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!
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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).
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9. The Crossfader In/Out Pushbutton defeats the
entire Crossfader function but leaves the Kill functions
active.
leaving the other frequencies playing. This area is always
active even when the crossfader is not. Try that for a neat
effect, or mix one channel’s treble with another channel’s
bass (by cutting the mid and bass on the first channel and
the treble and mid on the other channel.)
10. Crossfader/Kill Assign Switches lets you choose
which input channel will be heard when the Crossfader is
moved to the left or right and affected by the Kill function.
16. Master Level. This controls overall output level. Note
that you can select (18) whether you want stereo or mono.
11. The replaceable Crossfader achieves clean segues
between two selected input channels.
17. The Zone Levels control speaker volume for other outputs
such as control booth monitors, a tape deck, another
amplifier, a sub-woofer, another mixer or a satellite speaker
system. Note that you can select (18) whether you want
stereo or mono.
1 2 3 4
1 2 3 4
In this example, Channel 1 is selected on the Left and
Channel 3 is selected on the Right. With the Crossfader
centered both assigned channels are live. Use the
Crossfader for fast and seamless segues from one channel
to the next.
CONTRACTOR'S NOTE: Zone Level provides zone
control in installations where there are two separate rooms
(eg: a bar and a dance floor). The “Zone” volume should be
controlled from the mixer not from the amplifier.
18. The Stereo/Mono Toggle Switches allow you to select
Note: the crossfader is user replaceable. Simply unscrew
the two large screws which hold it in place, lift it out, and
disconnect its cable. Reattach the new crossfader and
screw it back onto the unit - you’re back in business!
REPLACEMENT CROSSFADERS can be purchased from
your local Numark Dealer, or by calling Numark Industries.
either stereo or mono output.
19. Stereo Auto Peak Hold Level Meter. The red LEDs
for +3, +5 and +8dB hold program peaks for an instant.
With peak metering, it's OK to be "in the red" as long as +5
or +8dB isn't constantly lit. Set crossover, equalizer and
power amplifier inputs to avoid distortion at each step in the
audio chain. Proper attention to the peak meters results in
the punchiest possible sound without audible distortion.
12. The 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.
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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
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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
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DM1 8 3 5 X
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
Telephone: +1 (401) 295-9000
North Kingstown, RI 02852 USA
Attention: Service Department
Fax:
E-mail:
+1 (401) 295-5200
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