Professional Disc Jockey Products
DM1635 STEREO MIXER
with the BEATKEEPER
OWNER’S MANUAL
NUMARK INDUSTRIES
11 Helmsman Road, North Kingstown RI 02985
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DM1 6 3 5
NUMARK DM1635 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
Beatkeeper Diagram
Beatkeeper Operating Instructions
Beatkeeper Troubleshooting
Rear Panel Diagram
Connection Diagram
Specifications
Page 10
Page 12
Page 14
Page 16
Page 17
Page 18
Page 19
Page 20
Block Diagram
Warranty and Service
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CONGRATULATIONS!
You have purchased the DM 1635 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 1635
brings to you the finest quality of DJ mixing equipment available today.
Thank you for buying Numark DJ products!
DM1 6 3 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
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.
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IMPORTANT INFORMATION...
Please read this entire manual before
connecting the DM1635 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 • Take care to connect only one cable at a time.
controls can last for many years. If they
malfunction (usually because of a dirty or dusty
environment) consult a professional technician.
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 DM1635 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 1635 FRONT PANEL DIAGRAM...
1 7
2 0
8
2 1
1 8
1 6
1 4
1 2
1
2
1 1
1 0
1 3
8
4
3
6
5
7
1 5
1 9
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GUIDED TOUR OF FEATURES AND OPERATING
INSTRUCTIONS...
If the DM1635 is your first mixer, please read this entire
manual before you begin operation.
4. Effect Send (Channels 1-4). Depress these
buttons when you want the signal from any input
channel to be routed to the Send Out Jacks. 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 DM1635 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
sources. Plug the DM1635 into AC power. Now you
are ready to switch it on.
Off1 2 3 4
Off1 2 3 4
6. The Replaceable Crossfader achieves clean
segues between the two selected input channels.
The DM1635 is divided into six functional blocks:
Input, Crossfader, DJ Mic, Master/Booth Output,
Equalizer, and BEATKEEPER. It is important to learn
how each of these work.
"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 DM1635 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
DM1635.
11. The Mic 2 Fader controls the Mic volume for the
1/4” connector on the rear of the mixer.
12.Mic Off/On/Talkover Switch.
Off turns off Mic 1
16. Stereo Auto Peak Hold Level Indicator.
This fast, accurate stereo meter tracks the output
level. The red LEDs for +3dB, +5dB and +8dB hold
program peaks for a second or two. With peak
metering, it's OK to be "in the red" as long as +5dB or
+8dB aren't constantly lit. Set the crossover, equalizer
and power amp inputs to avoid distortion at each step
in the audio chain. Proper attention to the peak meter
results in the punchiest possible sound without
audible distortion.
O n turns on Mic 1
Talkover turns down the input level of your music
sources from Channels 1-4.
Talkover is very useful for making announcements
without adjusting any levels.
Try using this feature for audience participation
when you want the music to temporarily cease
and the audience to be heard - “YEAH!”
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EQUALIZER SECTION
17. 6-Band Stereo Graphic Equalizer (EQ).
EQ compensates for differences in source material
sound quality. In ultra-compact mobile systems this EQ
can be used to tailor the sound to the acoustical
requirements of the room. Center frequencies are
42Hz, 152Hz, 480Hz, 1.5kHz, 4.8kHz and 15.4kHz.
Faders have a center detent for an accurate "flat”
response.
GENERAL EQ HINTS
• Boost the 42Hz band for deep bass tones and solid
kick drum sound. Use sparingly because this
dramatically increases demand on power amplifiers and
could drive them into “clipping” (see page 6).
• Cut slightly at 152Hz and more at 460Hz for extra
clarity. Note: Cutting is preferable to boosting.
• Boost 15kHz for a little "sizzle".
Below is a typical "house" EQ curve. Notice how the
knobs above "0" balance out the knobs below. Start
with this setting if you've never used a graphic EQ
before:
• As a general rule, less equalization is better!
18. Equalizer On/Off. This controls whether your
final output will be routed through the EQ or not.
MONITOR SECTION
19. The Monitor section includes the Program Mix
control, the Headphone Volume control and the
Headphone Jack. Connect headphones with a
standard 1/4" stereo plug. The Cue audio is sent to the
headphone amp using the Cue Assign Pushbutton
and the Pgm Mix control. The Program Mix controls
the amount of program audio in the headphones so that
beats can be matched exactly and segues are smooth
when a song is cued.
Below is an example of a poor EQ curve because it cuts
the output volume down by 6-10dB. You have to
compensate by running the Master output higher:
0
Below is the worst sort of curve to use because you are
using EQ to add volume. With exaggerated boost you
can easily run your power amplifiers into “clipping” (see
page 5) and damage your speakers.
20. 12V BNC Connector allows a 12 volt gooseneck
lamp to be connected directly to the mixer. This light is
readily available from your Numark dealer.
21. Power Switch and Power-On LED.
0
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theBEATKEEPER
H
I
Panel Diagram
F
G
E
A. CHANNEL SELECT-
Tap this button to select desired pre-fader input channel. The
respective input channel LED will light up 1,2,3,or 4
A
C
B. SYNC LOCK BUTTON-
B
D
When an input is not yet set and scanning for the tempo
tapping the Sync Lock button once will lock in the music 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. 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)
OFF- the Beatkeeper is not detecting sound from the
respective audio input
BLINKING- the Beatkeeper is detecting 'rhythm setting'
sounds from the respective audio input
D. BEAT ASSIST BUTTON-
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.
H. TEMPO DIFFERENCE GRAPH
OFF- One or Both of the audio inputs are not yet sync locked
E. BPM DISPLAY-
(--)- No audio signal is being processed for this input or the
Beatkeeper has not completed tracking the BPM for this input
(NUMBER)- The respective input is currently playing music
with this number of Beats Per Minute (as determined by the
Beatkeeper)
in
RED LED ON- The audio inputs tempos are not aligned
YELLOW LED ON- The audio inputs tempos are close to
aligned
GREEN LED ON- The audio inputs tempos are perfectly
aligned
F. DOWN BEAT LED (red)
OFF- the Beatkeeper has not yet matched the beat of the
respective audio input
BLINKING- the Beatkeeper has matched this LED to the
beat of the respective audio input
ON- the Beatkeeper is waiting for the music to start on the
I. BEAT OFFSET GRAPH
OFF- one or both of the audio inputs are not yet sync locked
or are not sending an audio signal
RED LED ON- the audio inputs beats are not aligned
YELLOW LED ON- the audio inputs beats are close to
aligned
respective input
GREEN LED ON- the audio inputs beats are perfectly
aligned
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After syncing an audio input, try speeding up and
BEATKEEPER OPERATION
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.
Beat Assist
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.
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.
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.
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.
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.
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.
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).
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).
When both bar graphs are in the green you
are ready to perform your mix!
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!
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.
In order to create the perfect mix, your goal
is to keep both bar graphs as close to
centered (green or yellow) as possible.
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.
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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DM1 6 3 5
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.
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.
To perform a 4-way mix just do the same thing again.
Syncing To Off Beats
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.
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 Syn
Lock LED on) and tap the Beat Assist button once to make
the Beatkeeper track the downbeat. You can also use this t
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.
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
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 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 tur
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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DM1 6 3 5
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
or b) Tap the Beat Assist button twice with the beat of the
music.
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.
Either method will cause the Sync Lock LED to illuminate.
T13 The Beat Offset graph is not illuminated, bu
the Tempo Difference graph is.
T10 The Beatkeeper seems to track the music for
a little bit right after using the Beat Assist, and
then drifts off.
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.
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.
T14 The Beat Offset graph has the green LED
illuminated when the red beat LEDs are a half
beat off from each other.
This indicates that the songs are synced at their half beats
With rap music and some house, mixing is often done on th
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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DM 1 6 3 5
DM1635 REAR PANEL DIAGRAM
1 0
8
8
1
2
7
7
7
9
7
9
7
9
4
5
3
6
REAR PANEL: INPUTS AND OUTPUTS
7. Channels 1-5 Line Inputs are unbalanced RCA
jacks. The Line Input is selected with the toggle switch o
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
inputs using a “Y” cable connector.
3. The Stereo Main Outputs are low-impedance RCA
connectors controlled by the Master fader.
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.
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 th
DM1635'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 3 5
DM1 6 3 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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DM 1 6 3 5
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
BEATKEEPER
Sync Lock Mode
BPM update rate
Every beat
BPM accuracy
+/- 1 BPM
BPM tracking range
50-199BPM
Bar graph update rate
Tempo difference graph resolution
Beat offset graph resolution
Every beat
+/-1 BPM per LED, green is +/-2 BPM
+/-7.5msec per LED, green is +/-15msec
Beat Assist Button
Minimum time between consecutive taps
Maximum time between consecutive taps
Consecutive taps averaging for BPM
0.3 seconds
1.2 seconds
Last 2 to 8 taps
POWER CONSUMPTION:
20 Watt typical, 28 watt with full headphone output
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DM1 6 3 5
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 Kingstown, RI 02852 USA
Attention: Service Department
Telephone: +1 (401) 295-9000
Fax: +1 (401) 295-5200
E-mail: [email protected]
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