Numark Industries Stereo Amplifier DM1635 User Manual

Professional Disc Jockey Products  
DM1635 STEREO MIXER  
with the BEATKEEPER  
OWNER’S MANUAL  
NUMARK INDUSTRIES  
11 Helmsman Road, North Kingstown RI 02985  
 
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.  
0
MONITOR SECTION  
19. The Monitor section includes the Program Mix  
control, the Headphone Volume control and the  
Headphone Jack. Connect headphones with a  
standard 1/4" stereo plug. The Cue audio is sent to the  
headphone amp using the Cue Assign Pushbutton  
and the Pgm Mix control. The Program Mix controls  
the amount of program audio in the headphones so that  
beats can be matched exactly and segues are smooth  
when a song is cued.  
Below is an example of a poor EQ curve because it cuts  
the output volume down by 6-10dB. You have to  
compensate by running the Master output higher:  
0
Below is the worst sort of curve to use because you are  
using EQ to add volume. With exaggerated boost you  
can easily run your power amplifiers into “clipping” (see  
page 5) and damage your speakers.  
20. 12V BNC Connector allows a 12 volt gooseneck  
lamp to be connected directly to the mixer. This light is  
readily available from your Numark dealer.  
21. Power Switch and Power-On LED.  
0
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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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DM1 6 3 5  
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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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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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
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.  
Numark - The Prove n Le ade r in DJ Te chnology  
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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  
Numark - The Prove n Le ade r in DJ Te chnology  
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DM1 6 3 5  
BLOCK DIAGRAM...  
Numark - The Prove n Le ade r in DJ Te chnology  
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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  
 

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