Ecler WARM4 User manual

50-0438-0101 WARM4 EN
WARM4
DJ MIXERS
Four Channel Analogue Rotary Mixer
USER MANUAL
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION

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PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
TABLE OF CONTENTS
1. PRECAUTIONS.............................................................................................................................3
1.1 Important Remark ................................................................................................................... 3
1.2 Important Safety Instructions.............................................................................................. 4
1.3 Cleaning ..................................................................................................................................... 4
2. PACKAGE CONTENTS ...............................................................................................................5
3. WARM4 and ECLER HISTORY.................................................................................................5
4. DESCRIPTION & FEATURES ....................................................................................................7
4.1 Main Features ........................................................................................................................... 7
5. PANEL FUNCTIONS....................................................................................................................8
6. SETUP...........................................................................................................................................10
6.1 Audio Input Connections.....................................................................................................10
6.1.1 Phono Inputs ........................................................................................................................10
6.1.2 Line Inputs.............................................................................................................................11
6.1.3 Microphone Inputs..............................................................................................................11
6.2 Audio Output Connections.................................................................................................11
6.2.1 HOUSE Output....................................................................................................................11
6.2.2 BOOTH Output....................................................................................................................12
6.2.3 Record output ......................................................................................................................12
6.2.4 FX Send/Return effects loop...........................................................................................12
6.2.5 Headphones .........................................................................................................................12
7. QUICK START.............................................................................................................................13
8. OPERATION................................................................................................................................15
8.1 Start-up ....................................................................................................................................15
8.2 Control Description...............................................................................................................15
8.2.1 Input selector .......................................................................................................................15
8.2.2 Channel TRIM ......................................................................................................................15
8.2.3 Equalization ..........................................................................................................................15
8.2.4 Isolator ...................................................................................................................................16
8.2.5 Analogue Subharmonic Synthesizer ............................................................................16
8.2.6 Monitoring System.............................................................................................................18
8.2.7 Sending to external effects units FX Send/Return ..................................................19
8.2.8 Potentiometers....................................................................................................................19
8.2.9 HOUSE and BOOTH output levels...............................................................................19
8.3 Further Considerations ........................................................................................................20
8.3.1 Ground loops........................................................................................................................20
8.3.2 Background noise...............................................................................................................20
8.3.3 Audio connections..............................................................................................................20
9. TECHNICAL DATA ....................................................................................................................21
9.1 Technical Specifications ......................................................................................................21
9.2 Mechanical Diagram.............................................................................................................24
9.3 Configuration Diagram ........................................................................................................25

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PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
1. PRECAUTIONS
1.1 Important Remark
The lightning flash with arrowhead symbol, within an equilateral triangle, is
intended to alert the user to the presence of uninsulated “dangerous voltage”
within the product’s enclosure that may be of sufficient magnitude to constitute
a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user
to the presence of important operating and maintenance (servicing) instructions
in the literature accompanying the appliance.
WARNING (If applicable): The terminals marked with symbol of “ ” may be of sufficient
magnitude to constitute a risk of electric shock. The external wiring connected to the terminals
requires installation by an instructed person or the use of ready-made leads or cords.
WARNING: To prevent fire or shock hazard, do not expose this equipment to rain or moisture.
WARNING: A device with Class I construction shall be connected to a mains socket-outlet
with a protective earthing connection.
WARNING: This product must not be discarded, under any circumstance, as
unsorted urban waste. Take to the nearest electrical and electronic waste treatment
centre.
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential area
is likely to cause harmful interference in which case the user will be required to correct the
interference at his own expense.

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PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
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1.2 Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this device near water.
6. Clean only with dry cloth.
7. Do not block any ventilation
openings. Install in accordance with
the manufacturer’s instructions.
8. Do not install near any heat sources
such as radiators, heat registers,
stoves, or other device (including
amplifiers) that produce heat.
9. Do not defeat the safety purpose of
the polarized or grounding type
plug. A polarized plug has two
blades with one wider than the
other. A grounding type plug has
two blades and a third grounding
prong. The wide blade or the third
prong are provided for your safety. If
the provided plug does not fit into
your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cord from being
walked on or pinched particularly at
the plugs, convenience receptacles,
and at the point where they exit
from the device.
11. Only use attachments/accessories
specified by the manufacturer.
12. Unplug the device during lightening
sorts or when unused for long
periods of time.
13. Refer all servicing to qualified
personnel. Servicing is required
when the device has been damaged
in any way, such as power supply
cord or plug is damaged, liquid has
been spilled or objects have fallen
into the device, the device has been
exposed to rain or moisture, does
not operate normally, or has been
dropped.
14. Disconnecting from mains: When
switching off the POWER switch, all
the functions and light indicators of
the unit will be stopped, but fully
disconnecting the device from mains
is done by unplugging the power
cable from the mains input socket.
For this reason, it always shall
remain easily accessible.
15. Equipment is connected to a socket-
outlet with earthing connection by
means of a power cord.
16. The marking information is located
at the bottom of the unit.
17. The device shall not be exposed to
dripping or splashing and that no
objects filled with liquids, such as
vases, shall be placed on device.
1.3 Cleaning
Clean the unit with a soft, dry clean cloth or slightly wet with water and neutral liquid
soap only, then dry it with a clean cloth. Be careful that water never gets into the unit through
any hole. Never use alcohol, benzine, solvents or abrasive substances to clean this unit. We
suggested removing all sweat stains after use.
NEEC AUDIO BARCELONA, S.L. accepts no liability for any damage that may be caused to
people, animal, or objects due to failure to comply with the warnings above.

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PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
Thank you for choosing our device Ecler WARM4!
We appreciate your trust.
It is VERY IMPORTANT to carefully read this manual and to fully understand its
contents before any connection in order to maximize your use and get the best
performance from this equipment.
To ensure optimal operation of this device, we strongly recommend that its
maintenance be carried out by our authorised Technical Services.
Ecler WARM4 comes with a 5-year warranty.
2. PACKAGE CONTENTS
•1x WARM4 Analogue Rotary Mixer Unit
•IEC Main Connector
•8x RCA Protection Caps
•First Steps Guide
•Warranty card.
3. WARM4 and ECLER HISTORY
Although the origins of the company date from 1965, ECLER presented its first mixer back in
the 70s: the A4, a simple 4 channel mixer oriented to Super 8 film sound edition. The company
grew in the 70s with the boom of disco and tourism.
It was the era of the AM 4 and AC 4, the first mixers tailored to DJs. The AC 4 was a high-
fidelity mixer designed to meet the most demanding sound requirements in discos, theatres,
cinemas, recording studios, conference rooms… The electronic circuits and the extreme
selection of all components and transistors used, made the AC 4 a professional high quality
mixer.
Milestones as SCLAT modular mixers, MAC Series High Standard Club mixers, AC-6 High-End
Installation mixer (recognize as a legendary mixer by Hispasonic), the HAK Series battle mixers
Designed and manufactured with expert consultation from DMC and ITF champions all over
the world, or the award-winning Eternal contactless magnetic crossfader are Ecler constant
innovation examples.
Ecler DJ Division Pro Team selected artists with a diverse and deep music background to share
its inputs looking for the perfect mixing devices. From minimal to deep house, from techno to
hip hop, from breaks to electro… all of them share our passion for music and technology. Dj’s

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PRECAUTIONS
PACKAGE
CONTENTS
WARM4
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ECLER HISTORY
DESCRIPTION
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PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
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OPERATION
like Michael Mayer, Pastaboys, Luciano, Antoine Clamaran, Funk D’Void, Dj Hell, Ricardo
Villalobos, Savas Pascalidis (to name a few). When it comes to gear, they need the maximum
quality, reliability and tools to express their creativity.
Ecler mixers was installed in prestigious clubs worldwide, such as Pacha (Marrakech) or Café
del Mar (Ibiza).
WARM4 is Ecler's newest rotary analogue mixer, inspired by New York's Paradise Garage,
described by François Kevorkian as the "temple of music" and whose influence has significantly
shaped some of today's best clubs.
Designed and manufactured in our Barcelona facilities, WARM4 is a mixer that keeps in mind
the classic Ecler mixers structure, with completely redesigned circuitry and mechanics. This
goes from the new PCB board that further improves noise level and dynamic range, to the
front-plate screw potentiometers, carefully hand-assembled by our production team.
Keeping alive its innovative spirit since the first A4 mixer in 1971, Ecler introduces a dj tool
never included in a mixer before: an analogue subharmonic synthesizer. Inspired by the original
device installed in the Paradise Garage booth, we have created our own circuit that allows the
subharmonic generator to be tuned to different frequencies so that the dj can adapt it according
to the recorded song and the features of the sound system.
In WARM4 you will also find the 4th order Isolator filter already included in WARM2, as well
as 4 mixing channels, 3-band full EQ cut per channel and Alps metal shaft high quality
potentiometers. Using your favourite external effects module has never been easier. WARM4
offers you the opportunity to send the PRE/POST fader signal, as well as regulate and pre-
listening to the amount of effects return.
WARM4 is specially designed for sound systems capable of reproducing this type of subsonic
frequencies, clubs, festivals and events where subwoofers are of vital importance. Bring to
your audience an unprecedented experience on the dancefloor and a different way of feeling
the music.

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PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
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PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
4. DESCRIPTION & FEATURES
WARM4 is a professional four channel analogue rotary DJ mixer, designed and manufactured
by ECLER in Barcelona. Featuring 4 phono/line channels, 2 MIC inputs, classic sharp filters and
a 4th order Isolator. WARM4 includes an unique feature, an Analogue Subharmonic
Synthesizer selectable per channel, specially designed to generate and reinforce ultra-low
frequencies.
4.1 Main Features
•4 Mixing channels.
•4 PHONO inputs.
•4 LINE inputs.
•2 MICRO inputs.
•Master Output on XLR and RCA
connectors.
•Booth Output on XLR and RCA
connectors.
•Headphone Monitor Output on 6.3mm
Jack and 3.5mm mini-jack.
•3 band isolator full cut EQ.
•3 band isolator (300Hz and 4KHz, -
∞/+12dB, 4th order 24dB/oct ).
•Analogue Subharmonic Synthesizer
for sub-bass frequency reinforcement
selectable per channel.
•Maximum Output without distortions:
21dBV (23dBu).
•FX Send control and Pre/Post fader
selector per channel.
•FX Return control and PFL.
•Alps metal shaft high quality
potentiometers.
•Mechanized from a solid block of
aluminium knob, without visible screw.
Ecler Unique design.
•Wooden side panels included.

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PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
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FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
5. PANEL FUNCTIONS

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PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
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PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
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OPERATION
1. LED indicator ON
2. Input Selector (PHONO, LINE MIC)
3. Input sensitivity adjust, TRIM
4. Treble control, HIGH
5. Midrange control, MID
6. Bass control, BASS
7. Subharmonics activation button
8. Send switch to effect bus, PRE/POST
9. Effect Send controller, FX SEND
10. Pre-Fader listening control, PFL
11. Isolator control
12. Isolator activation button
13. Channel volume control
14. MIC Channel 4 balanced input
15. LED VU Meter Mix/House/Booth
16. LED VU Meter switch
17. Pre-Fader FX listening control, PFL
18. FX Return monitoring control
19. Subharmonic frequency selector
20. Subharmonic LED VU Meter
21. Subharmonic level control
22. Subharmonic activation button
23. Unbalanced REC output
24. Master volume control, HOUSE
25. Monitoring volume control, BOOTH
26. L+R Mono booth activation button
27. Booth balance PAN control
28. PFL/MIX monitoring control,
SOURCE
29. Monitor Headphones Volume control
30. Stereo Jack Headphones
31. LED VU meter Channel 1
32. Phono Input, PHONO 1
33. Line Input, LINE 1
34. Phono Input, PHONO 2
35. Line Input, LINE 2
36. Phono Ground Pin
37. Phono Input, PHONO 3
38. Line Input, LINE 3
39. Microphone Balanced Input, MIC 3
40. Phono Input, PHONO 4
41. Line Input, LINE 4
42. Phono Ground Pin
43. XLR Monitoring Balanced Output,
BOOTH
44. RCA Monitoring Unbalanced Output,
BOOTH
45. XLR Master Balanced Output,
HOUSE
46. RCA Master Unbalanced Output,
HOUSE
47. External FX send Output, FX SEND
48. External FX return Input, FX RETURN
49. Power Switch
50. Mains Socket

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DESCRIPTION
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TECHNICAL
DATA
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6. SETUP
WARM4 is conceived as club mixer to be placed between turntables or digital players.
We recommend to place it in a comfortable position for the end user, without placing
it in direct contact with the turntables to avoid transmitting shocks and vibrations during
use.
Because of the high gain of the PHONO and MICRO inputs, always try to place the mixer as
far away as possible from noise sources (dimmers, engines, etc.) and mains wires.
The WARM4 operates with a universal input power supply and can perfectly works without
any internal modification from 90V to 264V –47 to 63Hz. Ensure that the mains-wire is far
away from the signal-cables in order to avoid any possible audio hum.
In order to protect the unit from an eventual electrical overload it carries a T 0.5A fuse. Should
it ever blow up, unplug the unit from mains and replace it with an identical one. If the new fuse
blows again contact immediately with our authorized technical service.
Never short-circuit the security path nor use a higher value fuse.
Fuse substitutions have to be performed by a qualified technician.
6.1 Audio Input Connections
INPUT 1
PHONO
Turntable
INPUT 1
LINE
CD or Digital Deck
INPUT 2
PHONO
Turntable
INPUT 2
LINE
CD or Digital Deck
INPUT 3
MICRO
Microphone
INPUT 3
PHONO
Turntable
INPUT 3
LINE
CD or Digital Deck
INPUT 4
MICRO
Microphone
INPUT 4
PHONO
Turntable
INPUT 4
LINE
CD or Digital Deck
6.1.1 Phono Inputs
Phono Turntables must be fitted with a magnetic cartridge with nominal output level
between -55dBV and -25dBV (1.77 to 56mVrms). The WARM4 PHONO inputs (32, 34, 37,
40) have high headroom (margin before saturation) and they can handle higher output
cartridges than usual. These inputs are supplied with a nominal input sensitivity of ‑40dBV
(10mVrms). Use TRIM control in order to adjust the input sensitivity depending by the
cartridges in use.

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6.1.2 Line Inputs
The sensitivity of the inputs (33, 35, 38, 41) marked as LINE is 0dBV (1Vrms). You can
connect sound sources such as CD or digital players, as well as keyboards, drum machines
and other instruments.
6.1.3 Microphone Inputs
The MIC inputs (39, 14) are ready for a nominal input level of -50dBV (3.16 mVrms). The
connection of balanced signals is as follows:
Hot or direct signal
>
Tip
Cold or inverted signal
>
Ring
Ground
>
Sleeve
Low impedance (200 to 600 ohm) monophonic microphones must be used. For non
balanced microphones we recommend monophonic jack plugs although stereo ones are
also suitable if the ring is short-circuited to the sleeve. The WARM4 includes 18V Phantom
power for condenser microphones. An internal jumper allows disabling the phantom power.
The WARM4 MICRO inputs is delivered with enabled phantom power by default (see the
configuration diagram).
6.2 Audio Output Connections
HOUSE
Main Room power amplifier
BOOTH
Booth/Room2 power amplifier
REC
Recording
FX Send/Return
External effect devices (Input and Output)
Monitor
Headphones
6.2.1 HOUSE Output
This stereo output feeds the PA system through balanced XLR3 connectors (45) and an
unbalanced RCA (46) connector. The nominal level of HOUSE output is set to 0dBV (1Vrms)
by default, but it can be set to +12dBV (4Vrms) using an internal dip-switch (look at
Configuration Diagram). The HOUSE output level is controlled by the HOUSE potentiometer
and can be monitored through the HOUSE VU-Meter (15) when the VU-Meter switch (16)
is set to HOUSE.

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6.2.2 BOOTH Output
Commonly used as an independent local "Booth" output for the DJ. This stereo BOOTH has
balanced XLR3 (43) and unbalanced RCA (44) connections and its level is set at 0dBV
(1Vrms) but can be changed to +12dBV (4Vrms) through internal dip-switch (look at
Configuration Diagram). The BOOTH level is controlled by the BOOTH potentiometer and
can be monitored through the BOOTH VU-Meter (15) when the VU-Meter switch (16) is
set to BOOTH.
6.2.3 Record output
This output pair uses RCA type connectors. REC is placed on the faceplate upper right corner
(23). The nominal level of the REC output is 0dBV (1Vrms). This output is taken post-fader,
before the MASTER signal.
6.2.4 FX Send/Return effects loop
The RCA connectors on the FX SEND output and the FX RETURN input allow creating a
signal loop for external effects processors, samplers or sequencers. The nominal level for
the SEND output, as well as for the RETURN input, is 0dBV (1Vrms).
The signal sent to the FX SEND output can be taken before or behind the fader using the
PRE/POST switch and the send level can be set using the related potentiometer. The FX
Return can be pre-listened with the FX PFL button, and the FX return signal level added can
be set using the FX Return potentiometer.
6.2.5 Headphones
In order to obtain the best performances, Headphones should be high impedance type (200-
600ohm). Plug them in the MONITOR output (30) on the faceplate down right corner: 1/4"
and 1/8” stereo jack are available for connection. Sleeve is Ground, Ring is Right Channel
and Tip is Left Channel.

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WARM4
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ECLER HISTORY
DESCRIPTION
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PANEL
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DATA
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7. QUICK START
Install and connect the WARM4 mixer as described in Setup chapter.
This Quick Start guide explains a simple procedure to route and headphone monitoring
a turntable.
1. Set the controllers to their initial
position
Set Channel 1 TRIM, HIGH, MID and
BASS (3, 4, 5 and 6) rotary controls
to their central position. Set the
channel potentiometer (13) to zero
rotating it counter clockwise.
2. Connect your turntable
Connect your turntable to the
PHONO input on channel 1 (32),
choose your favourite record and start
to play it.
3. Connect the headphones
Connect your headphones to the
related output (30). Set the
headphones VOLUME controller (29)
to minimum level and move the
SOURCE selector (28) to PFL
position.
4. Connect the main power cable
Connect the power cable to the power supply input (50) and turn it on using the MAINS
INPUT switch (49). Both elements are located on the mixer backside.
5. Select the input source
Make sure that the channel 1 input switch is placed in PHONO position and press the
PFL button (10). The PFL VU-meter (31) should start to work. If this doesn’t happen,
verify that the turntable is correctly connected and that the record is playing.

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6. Adjust the input level
Move the TRIM (3) control until the VU-meter shows 0dB.
7. Send the signal to the HOUSE
Rotate the channel 1 potentiometer (13) clockwise at its maximum.
8. Monitor the output with your headphones
Adjust the VOLUME controller (29) to obtain a comfortable monitoring volume. Now
you should hear music with your headphones. Turn the SOURCE controller (28)
clockwise to crossfade from the PFL signal to the MIX signal. When this controller is
completely turned to the right, only the MIX signal will be monitored. In this case the
PFL and the MIX signal are both referred to channel 1 so you will listen the same signal
in both positions.
9. Check the EQ operation
Adjust the EQ of the track with the 3-way stereo equaliser (4, 5, 6) and unleash your
creativity with the powerful 3-way isolator (11). Activate the Isolator with the ON
button (12). This 4th order tone control has been designed for a creative sound edition:
each way can be individually isolated and boosted using the big and ergonomic rotary
controllers.

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WARM4
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ECLER HISTORY
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8. OPERATION
8.1 Start-up
Switch on the mixer using the switch (49) located in the mixer back panel. Now the LED ON
(1) indicator will be lit in green. Even if the typical bump noise of audio devices during the start-
up is minimized in the WARM4 thanks to the internal anti-bump circuits, it is always
recommendable to turn on the devices using the following sequence:
1. Sound sources
2. Mixer, sound processors, effects
3. Finally, power amplifiers or active loudspeakers
The shut-down routine should be done by following the exact reverse sequence in order to
avoid any possible damage to the loudspeakers.
8.2 Control Description
8.2.1 Input selector
Each channel provides an input toggle switch selector (2) that allows selecting the PHONO
or LINE inputs for the first and second channels and PHONO, LINE or MIC inputs for the
third and fourth channel.
8.2.2 Channel TRIM
All the WARM4 input channels have an accessible TRIM input sensitivity control (3). These
controls adjust the input level of each channel in order to compensate the level of different
sources connected to the mixer, or different phono cartridges in case of turntables.
The gain adjustments should be done with great care, using the channel VU-meter (31). The
standard level reference used to mix audio signals is 0dBV.
8.2.3 Equalization
The rotary tone controls for each channel provide a +10/-30dB boost/cut at high (4) and low
frequencies (6) and +10/-25dB at the mid range (5). This control allows equalizing the track
in use or it can be used in all the creative ways possible.

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8.2.4 Isolator
In addition to the channel EQ, a powerful 3-way Isolator (11) is available on the main output.
It provides a +12/-70dB boost/cut at high and low frequencies and +12/-40 dB at the mid
range. This great attenuation and boost range is specially designed for creative live
performance.
The isolator can be switched on and off at will via the ON button. When the LED is lit, the
isolator is active. The by-pass of this function is a true by-pass with relays and is designed
as a function not to be used live. With true by-pass, the signal does not pass through the
isolator filters and there is less phase distortion, resulting in a more faithful sound.
Being completely analogue, in the presence of a musical signal and when switching
the isolator on and off, clicks can occur, and this is the reason for NOT using it live.
Use equalization and isolator carefully; by boosting too much the low frequency
range, you can induce an excessive displacement of the loudspeakers membrane. Ecler
is not liable for any failure of third-party devices due to improper use of this
functionality.
8.2.5 Analogue Subharmonic Synthesizer
In the article “State-of-the-Art Discotheque Sound Systems-System Design and Acoustical
Measurement” of AES (Audio Engineering Society) of 1980, Richard Long and Alan
Fierstein, the iconic sound system designers of Paradise Garage, wrote:
“The initial reaction of most audio engineers to the idea of a non-technical person such as a
DJ controlling the frequency response of a very sophisticated sound system is complete
shock and disbelief. In order to explain our concept of a disco system, let us give this
analogy; in a discotheque the sound system can be considered to be the orchestra while the
DJ is the conductor. The conductor’s job is to stimulate and entertain the audience; the DJ
must entertain the dancers. The DJ is not reproducing the works of Bach or Brahms as
performed in a symphony hall but is instead playing music which was created in a multi-
track studio under artificial conditions and mixed by an engineer also attempting to create
the most exciting sound possible.
There can be no doubt that many people, especially those trained in music and the audio
sciences, have been at one time or another to a disco and been totally offended by the
sound. One’s first reaction was probably that the music was too loud, but of course this is
not the whole answer. The quality of the components, particularly speakers is one potential
source of offensive sound, but even more important is the relative loudness of the various
frequency ranges. For example, sub-bass in the range below 100Hz when played at 110dB
SPL is not annoying at all whereas upper mid-range from 2k to 4kHz at 110dB is extremely

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offensive. A prominent mid-range around 500 Hz with a lack of mid bass around 100 to 200
Hz can be very annoying.
In other words, the frequency response must be tailored to be smooth with no prominent
peaks or dips while at the same time de-accentuating certain frequency ranges which can
be offensive at the high sound pressure levels found in most discotheques. When properly
done, the result will be a pleasing and exciting sound with no offensiveness or listener
fatigue even at continuous high sound pressure levels. For this same reason, by giving the
DJ control over the extreme low and the extreme high end but not allowing him any control
over the main full frequency range, he is allowed to create extremely exciting sound effects
without affecting the overall balance.”
Larry Levan was the best conductor of the Paradise Garage orchestra, and Ecler want to
dedicate WARM4 to him, adding a very powerful feature that was part of the Paradise
Garage sound system under the control of the DJ, and that has never been included in a DJ
mixer before: the Analogue Subharmonic Synthesizer.
With Ecler Analogue Subharmonic Synthesizer the dj can colour the lower mixer response
and consequently the tracks feeling, giving more punch to the kicks and to the bass lines, in
a very unusual way. This is perfect, for example, to give new life to a vinyl record from the
1970s that lacks low frequencies.
Yes, because this is not a simple shelf filter or a resonant filter. The Analogue Subharmonic
Synthesizer generates sound waves at half of the frequency of fundamentals between
120Hz and 50Hz, in a quite selective way, generating copies in the range of 60Hz-25Hz.
This same principle has been used during the golden age of Hi-Fi to reconstruct the very
low frequencies lost during the vinyls press process or during tape recordings that, for
different physical reasons, are not supported in these physical audio supports.
Very low frequencies require dedicated loudspeakers, such as subwoofers, to be
appreciated. Using this functionality with speakers that are not capable of reproducing these
range, may be counterproductive or even detrimental to the speakers.
Please do not use the subharmonic synthesizer with small near-field studio
monitors that cannot reproduce frequencies from 25 to 60Hz. Ecler is not responsible for
the misuse of this feature.
In the most recent digital audio supports, the whole audible spectrum can be recorded and
the final effect of the Analogue Subharmonic Synthesizer , depending by the recording, in
some cases can be imperceptible or even annoying. The mastering of each track is unique
and the use of the Analogue Subharmonic Synthesizer leads to a different result for each
track.

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Operation:
The Analogue Subharmonic Synthesizer function uses a separate bus and can be
activated on each channel using the SUB buttons (7). Once the function is activated in one
of the channels, using the subharmonic level control (21) it is possible to choose the amount
of low frequency signals to add to the original content and it can be monitored using the
subharmonic VU-Meter (20).
•The first LED (Green) indicates an average value of -18dBV and it acts as a signal
present LED.
•The second LED (Yellow) indicates an average value of 0dBV.
•The third LED (Red) starts to blink with an average value of +4dBV. Depending by
the original content, it is possible to increase the low end spectrum level up to
+12dBV.
•The ON button (22) allows to switch on the harmonic generation circuit and it acts as
a general activation button of the function.
Use the Analogue Subharmonic Synthesizer very carefully; Please check the
Subharmonic VU-meter level before activating the ON button. By boosting too much the
low frequency range, you can induce an excessive displacement of the loudspeakers
membrane. The combined use of Isolator and subharmonic synthesizer, if not used
properly, can be very dangerous for the loudspeakers. Ecler is not liable for any failure
of third-party devices due to improper use of this functionality.
In any case, the subharmonic function does not change the spectrum of musical content
outside the indicated frequencies. In addition, WARM4 includes an HP anti-rumble filter at
20Hz that makes sure to reduce resonance coupling problems with turntable needles.
8.2.6 Monitoring System
WARM4 is equipped with a flexible and easy monitoring system that will allow the
performers to finely tune PFL (Pre-fader listening) and Mix levels of each input through the
channel VU-METER (31) and the HEADPHONES. Each channel can be monitored visually
and pre-listened pressing the dedicated PFL (10) button.
For HEADPHONES monitoring, the SOURCE rotary potentiometer (28) allows you to blend
a selected PFL together with the main MIX Program. The VOLUME rotary potentiometer
(29) controls the level of headphones output.

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8.2.7 Sending to external effects units FX Send/Return
The 4 channels of WARM4 are equipped with rotating potentiometers (9) that allow
sending the signal to an external effects unit, sampler, etc. These potentiometers allow to
precisely adjusting the signal level sent from each channel.
The FX SEND output (47) has to be connected to the effects processor’s input and its output
to the RETURN input (48) or any LINE input. FX Return can be pre-listened with the FX PFL
button (17) and the signal level can be adjusted with the FX Return potentiometer (18).
This signal send can be configured either PRE or POST fader with the PRE/POST toggle
switch (8).
8.2.8 Potentiometers
The WARM4 is equipped with original Japanese ALPS blue velvet and RK09L metal shaft
potentiometers that offer extremely soft and smooth transitions both for channels and
isolator controls.
8.2.9 HOUSE and BOOTH output levels
WARM4 features two main output level controls: HOUSE and BOOTH. The master level is
controlled by the HOUSE (24) level knob. The BOOTH level is controlled by the BOOTH
(25) level knob.
Look at Configuration Diagram chapter to adjust the output level to adapt output
levels to your amplifiers or amplified speakers. Use the HOUSE/MIX/BOOTH VU-meter
(15), in order to have a real perception of the signal output. Select the signal you want to
monitor with the switch (16 Front Panel) below the VU-Meter (House-MIX-Booth).
HOUSE output is electronically balanced so the unbalanced level always matches with the
balanced level.
WARM4 has extended headroom: its maximum output without distortion can reach 21dBV
(23dBu)!
Take care of the devices connected to the mixer outputs checking the VU-meters
and please try to stay away from the red-light zone!

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8.3 Further Considerations
8.3.1 Ground loops
Avoid that the sources connected to the mixer and the devices connected to its output have
their ground reference interconnected; it means that the ground reference should never have
two or more different paths, because hums and noise can appear influencing the sound quality.
In order to avoid ground loops, ensure that the shielding of cables, if connected to the chassis,
are never connected with each other.
8.3.2 Background noise
The use of active circuitry can yield, depending on the configuration, to a significant noise level.
The WARM4 have been specifically designed with a very reduced noise figure. Anyway, the
noise level will always depend by the correct use and installation of the mixer and by the
correct gain chain. It is not the same setting up the channel potentiometer at "2" and the
HOUSE level at "10" that vice versa. In the first case you get a poor signal to noise ratio that
will be fully amplified by the master output while on the second we have a good signal to noise
ratio only amplified by "2". As a result, the background noise is greater in the first case than in
the second one.
8.3.3 Audio connections
As a general rule of thumb, make the signal connections as short as possible and use the best
connectors and cable available. Cables and connectors are frequently held cheap, forgetting
that a bad connection can result in a poor sound quality.