Ecler WARM4 User manual
2
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 Notice...................................................................................................................... 3
1.2 Key Safety Directions............................................................................................................. 4
1.3 Cleaning Directions................................................................................................................. 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
3
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
1. PRECAUTIONS
1.1 Important Notice
The flashing light with an arrowhead symbol inside an equilateral triangle on it
is intended to alert the user of the presence of non-insulated “dangerous voltage”
within the enclosure, which might be of sufficient magnitude to pose a risk of
electric shock to users.
The exclamation mark within an equilateral triangle is intended to alert the user
of the requirement for important operating and maintenance (servicing), for which
instructions may be found in the literature accompanying the appliance.
WARNING (If applicable): Terminals marked with symbol “ ” may be of sufficient
magnitude to pose a risk of electric shock. The external wiring connected to terminals requires
installation by a technician, or the use of ready-made leads or cords.
WARNING: To prevent fire or shock hazard, do not expose this equipment to rain or humidity.
WARNING: A device with Class I manufacturing ought to be connected to a mains socket
outlet with a protective earthing connection.
WARNING: Ecler products have a long lifetime of more than 10 years. This product
must never be discarded as unsorted urban waste, but must be taken to the nearest
electrical and electronic waste treatment centre.
This equipment has been tested and found to comply with the limits of a Class A
digital device, pursuant to part 15 of the FCC Rules. Such 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 in radio communications. Operation of this equipment in a residential area
might cause harmful interference, in which case, the user will be required to correct the
interference at his own expense.
4
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
1.2 Key Safety Directions
1. Read the following directions.
2. Keep the following directions.
3. Heed all warnings.
4. Follow all directions.
5. Do not use this device in proximity
to water.
6. Clean only with a 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 devices (including
amplifiers) that may release heat.
9. Do not defeat the safety purpose of
the polarized or grounding type
plug. A polarized plug has two
blades, being 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, contact a qualified
electrician for a 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 of 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 damage,
liquid spillage or objects onto the device,
the device has been exposed to rain or
humidity, 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, therefore, it should
always remain easily accessible
15. Equipment is connected to a socket-
outlet with an 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 liquids, and no
liquid-filled objects, such as a filled up
glass, shall be placed on top of the
device.
1.3 Cleaning Directions
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
suggest 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.
5
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
Thank you for choosing our Ecler WARM4!
We greatly value your trust.
It is VERY IMPORTANT to carefully read this manual and to fully understand its
contents before any connecting takes place in order to make the best use of this
equipment, as well as to get the best performance from it.
To ensure optimal operation of this device, we strongly recommend that its
maintenance be carried out by our authorised Technical Services.
All ECLER products are covered by warranty, please refer to www.ecler.com or the
warranty card included with this product for the period of validity and conditions.
Ecler is truly committed with the environment and planet sustainability,
energy saving and CO2emission reduction. Recycling materials and using
non-contaminant components are also top priorities in our green crusade.
Ecler has deeply evaluated and analyzed the environmental impacts of all the
processes involved in the production of this product, including packaging, and has
alleviated, reduced and/or compensated for them.
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 launched its first mixer back in
the 1970s: the A4, a simple 4 channel mixer oriented to Super 8 film sound edition. The
company grew throughout the 70s with the boom of Disco music and the increase of tourism.
It was the era of the AM 4 and AC 4: the first mixers tailored for DJs. The AC 4 was a high-
fidelity mixer designed to meet the most demanding sound requirements in discotheques,
theatres, cinemas, recording studios, conference rooms… Its electronic circuits and a meticulous
selection of all components and transistors used, made of the AC 4 a professional high quality
mixer.
6
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
Milestones as SCLAT modular mixers, MAC Series High Standard Club mixers, AC-6 High-End
Installation mixer (branded as ‘legendary’ by Hispasonic), the HAK Series battle mixer,
designed and manufactured following 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 wise music background to share
our inputs in the quest for the perfect mixing devices. DJs who, playing from Minimal to Deep
House, from Techno to Hip-hop, Breaks to Electro… all share our passion for music and
technology. Djs the like of Michael Mayer, Pastaboys, Luciano, Antoine Clamaran, Funk D’Void,
Dj Hell, Ricardo Villalobos, Savas Pascalidis, to name a few, need top quality, reliability and
tools to express their creativity when it comes to gear
Ecler mixers were installed in prestigious clubs worldwide, such as Pachá (Marrakech) or Café
del Mar (Ibiza).
WARM4 is Ecler's latest rotary analogue mixer, inspired by New York's Paradise Garage’s
sound, the club described by François Kevorkian as the "temple of music" and whose influence
has significantly shaped some of today's best venues.
Designed and manufactured in our Barcelona facilities, WARM4 is a mixer that preserves
the classic Ecler mixers’ structure, though its circuitry and mechanics have been completely
redesigned, ranging from the new PCB board that further improves noise levels and dynamic
range, to the front-plate screw potentiometers, carefully hand-assembled by our production
team.
Keeping its innovative spirit alive since the first A4 mixer launched in 1971, Ecler introduces a
DJ tool never included in a mixer before: the 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, both to the recorded song, and to 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 to regulate and pre-
listen to the amount of the effects return.
WARM4 is specially designed for those sound systems capable of reproducing this type of
subsonic frequencies, such as clubs, festivals and events where subwoofers are of vital
importance. It will allow you to deliver your audience with an unprecedented experience on
the dance floor and an overall remarkable way to experience music..
7
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
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 a unique feature: an Analogue Subharmonic Synthesizer
selectable per channel and 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 connectors.
•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.
•Ecler’s unique design includes a
mechanized knob produced from a
solid block of aluminium and free of
any visible screws.
•Wooden side panels included.
9
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
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 activate 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 activate 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
10
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
6. SETUP
WARM4 is conceived as a club mixer to be placed between turntables or digital players.
We recommend placing it in a comfortable position for the user and in no direct contact
with the turntables in order to avoid the transfer of impacts and vibration during use.
Because of the high gain of the PHONO and MICRO inputs, always try to place the mixer as
distant as possible from noise sources (dimmers, engines, etc) and mains’ wires.
The WARM4 operates with a universal input power supply and works flawlessly without any
internal modification from 90V to 264V –47 to 63Hz. Make sure the mains’ wire is far-off from
the signal cables, so as to avoid any possible audio hum.
In order to protect the unit from an eventual electrical overload, a T 0.5A fuse is provided.
Should it ever blow up, unplug the unit from mains and replace it with an identical one. If the
new fuse also blows up, contact our authorized technical service immediately.
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 (allowance 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 in accordance with the
cartridges in use.
11
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
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 and drum
machines, amongst 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 are 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) by using an internal DIP switch (check the
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.
12
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
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 (check the
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’s 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 for a signal
loop for external effects processors, samplers or sequencers to be created. The nominal
level for the SEND output, as well as for the RETURN input, is 0dBV (1Vrms).
The reception of the signal sent to the FX SEND output may occur, either prior, or succeeding
the effect of the fader when using the PRE/POST switch. The issuing level can be set by
using the related potentiometer. The FX Return can be pre-listened to with the FX PFL
button, and the FX return signal added level can be set using the FX Return potentiometer.
6.2.5 Headphones
In order to obtain the best performance, headphones should be high impedance type (200-
600ohm). Plug them into the MONITOR output (30) on the faceplate’s lower 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.
13
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
7. QUICK START
Install and connect the WARM4 mixer as described in the Setup chapter.
This quick start guide offers a simple procedure towards the routing and headphone
monitoring of 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 by
rotating counter-clockwise.
2. Connect your turntable
Connect your turntable to the
PHONO input on channel 1 (32).
Select your favourite record and play
it.
3. Connect the headphones
Connect your headphones to the
related output (30). Set the
headphones’ VOLUME controller (29)
to its 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 at the back of the mixer.
5. Select the input source
Make sure the channel 1 input switch is placed in PHONO position and press the PFL
button (10). The PFL VU-meter (31) should start working. If this is not the case, verify
the turntable is connected correctly and the record set to be properly played.
14
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
6. Adjust the input level
Rotate the TRIM (3) control until the VU-meter shows 0dB.
7. Send the signal to the HOUSE output
Rotate the channel 1 potentiometer (13) clockwise to its maximum level.
8. Monitor output through your headphones
Adjust the VOLUME controller (29) to obtain a comfortable monitoring volume. You
should now be able to hear the music through your headphones. Turn the SOURCE
controller (28) clockwise to crossfade from the PFL signal to the MIX signal. Once this
controller is turned entirely to the right, only the MIX signal will be monitored, in which
case, the PFL and the MIX signal are both referred to channel 1, and you will listen to
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-band Isolator (11). Activate the Isolator with the ON
button (12). This 4th-order tone control has been designed for creative sound edition:
each band can be individually isolated and may be boosted using large ergonomic
rotary controllers.
15
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
8. OPERATION
8.1 Start-up
Turn the mixer on by using the switch (49) located at the mixer’s back panel. The LED ON
(1) indicator light will turn green. Even though the typical bump noise of audio devices when
started is minimized in the WARM4, resulting from the internal anti-bump circuits, it is always
recommended to turn devices on according to the following sequence:
1. Sound sources
2. Mixer, sound processors, effects
3. Lastly, power amplifiers or active loudspeakers
The shut-down routine should be done by following the exact reverse sequence, in order to
avoid possible damage to 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 channels.
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 to allow to compensate the level of different
sources connected to the mixer or, in the case of turntables, of different phono cartridges.
The gain adjustments should be made with great care through the diligent usage of 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 mid range (5). This control allows for the equalizing of
the track in use, though it may also be employed in endless creative ways.
16
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
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 mid
range. This exceptional attenuation and boost range is specially designed for creative live
performances.
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 an actual relaying device, and it is not
intended for its usage in live performances. Being a true by-pass, the signal does not pass
through the isolator filters, so there is a lesser degree of phase distortion, resulting in a more
faithful sound.
Since WARM4 is a completely analogue device, in the presence of a musical signal
and when switching the Isolator on and off, clicking sounds may occur, this being the
reason NOT to use it in live performances.
Use both equalization and the Isolator with great care. By over-boosting the low
frequency range, an excessive displacement of the loudspeakers’ membrane may occur.
Ecler shall not be held liable for the 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) from 1980, Richard Long and Alan
Fierstein, 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
17
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
SPL is not annoying at all whereas upper mid-range from 2k to 4kHz at 110dB is extremely
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 wants to
dedicate the WARM4 model to him, adding a very powerful DJ-controlled feature, which
was a component of the Paradise Garage sound system, and has never been included in a
DJ mixer before: the Analogue Subharmonic Synthesizer.
Ecler Analogue Subharmonic Synthesizer enables the DJ, to “colour” the lower mixer
response in a unique fashion and, consequently, to enhance the tracks’ feeling by providing
more punch to the kicks and bass lines. This is the perfect manner to, for instance, confer a
vinyl record from the 1970s lacking low frequencies with a newfound vitality to it.
We are not referring to basic shelf or resonant filters: the Analogue Subharmonic
Synthesizer generates sound waves at half the frequency of fundamentals (which oscillate
between 120Hz and 50Hz) in a fairly selective way, generating copies in the range of 60Hz-
25Hz. The same principle used to be applied during the golden era of Hi-Fi to reconstruct
the very low frequencies, lost during the vinyl record press process or during tape
recordings. Due to a number of assorted physical reasons, these frequencies were not
compatible with the aforementioned physical audio formats.
Very low frequencies require dedicated loudspeakers, such as subwoofers, to be
appreciated. Using this functionality with speakers unable to reproduce this specific range
of frequencies, may be counterproductive or even detrimental to the speakers.
Please do not use the Subharmonic Synthesizer feature with small near-field studio
monitors that cannot reproduce frequencies from 25 to 60Hz. Ecler will not be held
responsible for its misuse.
Most recent digital audio formats allow for the recording of the whole audible spectrum
and, in certain recordings, the final effect of the Analogue Subharmonic Synthesizer may 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 in each track.
18
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
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, by means of the subharmonic level control (21), it is possible to choose the
amount of low frequency signals to be added to the original content, which can be
monitored with 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 on
the original content, the low end spectrum level can be increased to up to +12dBV.
The ON button (22) switches on the harmonic generation circuit and it acts as a
general activation button for the function.
Make use of the Analogue Subharmonic Synthesizer with extreme care, and always
check the Subharmonic VU-meter level before activating the ON button. By over-
boosting the low frequency range, you might induce an excessive displacement of the
loudspeakers membrane. The combined use of the Isolator and the Subharmonic
Synthesizer functions, if not done properly, can result in damage to the loudspeakers.
Ecler will not be liable for the failure of third-party devices due to improper use of this
functionality.
The subharmonic function does not change the spectrum of musical content outside the
indicated frequencies. Additionally, WARM4 includes an HP anti-rumble filter at 20Hz that
ensures the mitigation of resonance coupling problems with turntable needles.
8.2.6 Monitoring System
WARM4 is equipped with a flexible and user-friendly monitoring system that allows
performers to finely tune PFL (Pre-fader listening) and mixing levels of each input through
the channel VU-METER (31) and the HEADPHONES. Each channel can be monitored
visually and pre-listened to by pressing the dedicated PFL (10) button.
For HEADPHONES monitoring, the SOURCE rotary potentiometer (28) allows the blending
of a selected PFL alongside the main MIX Program. The VOLUME rotary potentiometer (29)
controls the level of headphones output.
19
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
8.2.7 Sending to external effects units FX Send/Return
All 4 channels of WARM4 are equipped with rotating potentiometers (9) which allow for
the signal to be sent to an external effects unit, sampler, etc. These potentiometers enable
to accurately adjust the signal level sent from each channel.
The FX SEND output (47) ought to be connected to the effects processor’s input, and its
output, to the RETURN input (48) or to any input LINE. FX Return can be pre-listened to
with the FX PFL button (17), and the signal level may be adjusted via the FX Return
potentiometer (18).
The signal sent can be arranged, either PRE or POST fader, operating 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, which offer extremely soft and smooth transitions for both, 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.
Check the Configuration Diagram chapter to adjust the output level to be adapted 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, therefore, the unbalanced level always matches
the balanced level.
WARM4 has extended headroom: its maximum output without distortion can reach 21dBV
(23dBu)!
Protect devices connected to the mixer outputs by checking the VU-meters and
please, try to avoid the red-light zone!
20
PRECAUTIONS
PACKAGE
CONTENTS
WARM4
&
ECLER HISTORY
DESCRIPTION
&
FEATURES
PANEL
FUNCTIONS
SETUP
TECHNICAL
DATA
QUICK
START
OPERATION
8.3 Further Considerations
8.3.1 Ground loops
Avoid sources connected to the mixer and devices connected to its output having their
ground reference interconnected. This will result in the ground reference never having two
or more different paths, thus hums and noise shall not affect the sound quality. In order to
avoid ground loops, make sure the sheadings of cables, if connected to the chassis, are never
in contact with one another.
8.3.2 Background noise
Depending on what the configuration is, the use of active circuitry can generate a significant
noise level. The WARM4 has been specifically designed to include a very reduced noise
figure. However, noise levels will always depend on the correct use and installation of the
mixer, as well as on the correct gain chain. Setting the channel potentiometer up at "2" and
the HOUSE level at "10" is very different to doing it contrariwise. 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 to "2". As a result, the
background noise will be greater in the first case.
8.3.3 Audio connections
As a general guideline, make the signal connections as short as possible and use the best
connectors and cables available. Cables and connectors are frequently looked down upon,
overlooking the fact that a bad connection might result in poor sound quality.
Other manuals for WARM4
1
Table of contents
Other Ecler Dj Equipment manuals
