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eCOMPACT4BT
ANALOGUE PREAMPS AND MIXERS
4-channel Bluetooth® mixer
USER MANUAL
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CONTENTS
1. IMPORTANT WARNING .......................................................................................... 3
2. IMPORTANT SAFETY INSTRUCTIONS ....................................................................... 4
3. IMPORTANT NOTE ................................................................................................. 5
4. INTRODUCTION ...................................................................................................... 5
5. INSTALLATION ....................................................................................................... 7
5.1. Location, set up and ventilation ............................................................................... 7
5.2. AC connection and powering on .............................................................................. 7
6. FRONT PANEL ........................................................................................................ 8
7. BACK PANEL ......................................................................................................... 10
8. CONNECTIONS ..................................................................................................... 11
8.1. Audio Input Connections ........................................................................................ 12
8.2. Bluetooth® connection ............................................................................................ 15
8.3. Audio output connections ...................................................................................... 16
8.4. Other connections .................................................................................................. 19
9. OPERATION AND USE ........................................................................................... 19
9.1. Start-up .................................................................................................................. 19
9.2. Monitoring ............................................................................................................. 20
9.3. Channel gain and equalization .............................................................................. 20
9.4. Channel indicators ................................................................................................. 21
9.5. Talkover function ................................................................................................... 21
9.6. Outputs .................................................................................................................. 21
10. CONSIDERATIONS ................................................................................................ 22
10.1. Ground loops ........................................................................................................ 22
10.2. Background noise ................................................................................................. 22
11. BLOCK DIAGRAM ................................................................................................. 23
12. TECHNICAL SPECIFICATIONS ................................................................................. 24
13. PACKAGE CONTENTS ............................................................................................ 25
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1. IMPORTANT WARNING
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): terminals marked with the " " symbol may be of
sufficient magnitude to constitute a risk of electric shock. The external cables
connected to the terminals require installation by qualified personnel or the use of
pre-assembled cables.
WARNING: to prevent fire or shock hazard, do not expose this equipment to rain or
moisture.
WARNING: apparatus with Class I construction shall be connected to a mains
socket outlet with a protective earthing connection.
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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 apparatus 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, stoves or other
apparatus that produce heat, including amplifiers.
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
plugs, convenience receptacles, and the point where they exit from the
apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Unplug this apparatus during lightning storms or when unused for long
periods of time.
13. Refer all servicing to qualified service personnel. Servicing is required when
the apparatus 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
apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
14. Mains disconnection: turning off the POWER switch stops all the device
functions and indicators from operating, but complete disconnection is
achieved by disconnecting the mains power cable from its connector. For
this reason, it shall remain readily operable.
15. The unit is connected to a protective earthing plug via the power cord.
16. Part of the product labelling is located at the base of the product.
17. This apparatus should not be exposed to dripping or splashing and no
objects filled with liquids, such as vases, should be placed on the apparatus.
WARNING: this product must not be disposed of as unsorted household
waste under any circumstances. Go to the nearest electrical and electronic
waste recycling facility.
NEEC AUDIO BARCELONA, S.L declines any responsibility for damages caused to
people, animals or objects due to failure to comply with the above warnings.
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3. IMPORTANT NOTE
Thank you for choosing our 4-channel Bluetooth® eCOMPACT4BT mixer. 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.
The eCOMPACT4BT comes with a 3-year warranty.
4. INTRODUCTION
The eCOMPACT4BT is a desktop and 19" rackmount 4-channel mixer with
Bluetooth® for professional installation. Simple to operate, suitable for both
experienced and novice users. Features 4 microphone inputs, 6 stereo line inputs,
USB charging port, Bluetooth® wireless connection and a mini-jack input for
external devices. All microphone inputs have a switchable high-pass filter. 3-band
tone control and ALT Send (sub-mix channel) on all channels. Balanced main
output (XLR connector), SUB OUT output for sub bass (XLR connector) and
alternative ALT output (RCA connector). Stereo/mono switch for main output,
allowing various configurations: 2 stereo outputs (MAIN and ALT) or 2 mono
outputs (MAIN) and one stereo output (ALT), plus one mono output (SUB). The
SUB OUT also features a low-pass filter for connecting a subwoofer or using it as a
monitor output (filter disabled). One channel Talkover function for front panel
microphone input (48 V phantom power available for all microphone inputs), and
front panel mini-jack headphone output.
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Main features:
4-channel analogue mixer, one channel with adjustable Talkover
Desktop or 19" rack installation
4 microphone inputs, one of which on front panel with a combo connector
48 V phantom power for microphone inputs (rear panel selector)
6 RCA stereo line inputs, and one stereo mini-jack line input on front panel
Class 1 Bluetooth
®
wireless connection (up to 25 m range under ideal
conditions)
Source selector on each channel
All microphone inputs have a selectable high-pass filter (f
= 100 Hz)
c
All channels have a 3-band tone control (treble, midrange and bass)
Input signal presence and overload indicators on all channels
45 mm faders
ALT OUT (alternative output) send per channel. Sub-mix available
USB port for charging mobile devices
Balanced main output (MAIN OUT), XLR connector
Stereo/mono switch for main output
Signal indicators (LED) with measured output signal selector (MAIN OUT or
ALT OUT)
Unbalanced alternative or sub-mix output (ALT OUT), RCA connector
Sub-bass or auxiliary output (SUB OUT), XLR connector. Mono sum of the
main output signal
Low-pass filter available on SUB OUT (f
= 150 Hz)
c
Front panel headphone output, mini-jack
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5. INSTALLATION
5.1. Location, set up and ventilation
The eCOMPACT4BT has been specially designed to be used both as a desktop
mixer and a 19" rackmount unit, occupying three rack spaces with optional rack
mounting kit 3URMKIT.
The eCOMPACT4BT does not require ventilation due to its low power
consumption, however, it is recommended that the unit not be completely
enclosed or exposed to extreme temperatures. Fresh air should be allowed to pass
through the ventilation holes in the chassis, leaving at least one free rack unit
between each device and those installed above and below it in the rack.
If multiple products are installed in the same rack or in a cabinet with closed
doors, it is highly recommended to install fans in their upper and lower ends for a
forced airflow from the bottom up. This upward air flow will help to dissipate heat
generated inside.
5.2. AC connection and powering on
The eCOMPACT4BT is powered by alternating current (AC) through its external
power supply: 100-240 VAC, 50-60 Hz. This external power supply has several
interchangeable connectors: American, European, British and Chinese.
On the rear panel, the power on/off switch is next to the external power supply
connector. On the front panel, a POWER LED lights up when the unit is running.
To avoid buzzing, do not allow the external power supply cable to intertwine with
and run parallel to the audio shielded cables.
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6. FRONT PANEL
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1. GAIN: gain control of the channel input signal. Available on all 4 mixing channels.
2. TREB: high frequency control. Available on all 4 mixing channels.
3. MID: mid frequency control. Available on all 4 mixing channels.
4. BASS: low frequency control. Available on all 4 mixing channels.
5. ALT OUT SEND: switch to send the channel to the ALT OUT mix bus. Allows to
create a sub-mix of selected channels, with independent volume control.
6. PAIR: pairing switch for Bluetooth
7. BLUETOOTH
®
- LINE: source selector (channel 1 audio source, Bluetooth® or
®
connection
LINE input). The LINE input features a mini-jack connector on front panel.
8. SP: signal presence LED indicator. The green LED lights up or flashes when an
audio signal is present on that channel input. Available on all 4 mixing channels.
9. CLIP: signal clipping LED indicator. The red LED lights up or flashes when the
audio signal selected on that channel is clipping. Adjust the channel GAIN.
Available on all 4 mixing channels.
10. VOLUME: channel volume. Available on all 4 mixing channels.
11. LINE A – MIC – LINE B: audio source selector for channels 2 and 3; LINE A input,
LINE B input or MIC input.
12. HPF: high-pass filter for MIC input, with fixed 100 Hz cut-off frequency.
13. LINE – MIC: audio source selector for channel 4; MIC input or LINE input. The MIC
input features a combo connector (XLR-TRS jack) on front panel.
14. TALKOVER: channel 4 Talkover assign switch - audio signal with priority over the
main mix bus.
15. TIME: signal return time adjustment on the mixing bus. 0.3 to 3 seconds.
16. ATT: signal attenuation adjustment on the mixing bus. From 0 dB (no attenuation)
to 30 dB.
17. ST/MONO: MAIN OUT stereo/mono switch.
18. MAIN OUT VOLUME: MAIN OUT volume control.
19. MAIN OUT – ALT OUT VUMETER: MAIN OUT / ALT OUT signal selector for VU-
meter LED indicators.
20. ALT OUT VOLUME: ALT OUT volume control.
21. POWER: power LED indicator.
22. PHANTOM: phantom power LED indicator.
23. PHONES VOLUME: volume control for the PHONES OUT mini-jack connector on
front panel.
24. USB CHARGE: USB connector for charging mobile devices (charge-only port, no
file reading from USB media)
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7. BACK PANEL
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1. POWER: unit's power switch. Next to it is the external power supply
connector and a tab for securely fastening the power supply cable.
2. LPF: SUB OUT low-pass filter switch. Filter with fixed cut-off frequency of
150 Hz.
3. SUB OUT: balanced mono output with XLR connector.
4. ALT OUT: unbalanced stereo output with RCA connectors.
5. MAIN OUT: balanced stereo output with XLR connectors.
6. PHANTOM: phantom power (48 VDC) switch for microphone inputs.
7. INPUTS 1 - 4: mixing channel audio inputs. Balanced XLR connection for MIC
inputs, and unbalanced RCA connection for LINE inputs.
8. RS-232: serial communication port for troubleshooting (technical service
department).
8. CONNECTIONS
We recommend turning off all devices or putting them into standby mode before
making audio connections, whether they are input devices such as audio sources or
devices connected to mixer outputs such as power amplifiers.
When connecting a new audio device to the mixer inputs, if the mixer is turned on, it
is recommended to set the channel volume control to minimum, and to increase this
value until a desired mix level is reached.
Failure to follow these recommendations may result in loud noises that could
damage the connected devices or your hearing.
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8.1. Audio Input Connections
The eCOMPACT4BT features the following audio inputs, with the following
connection types:
INPUT 1: unbalanced stereo line input, with RCA connectors on rear panel
and 3.5 mm stereo mini-jack connector on front panel. Bluetooth® wireless
audio connection (see chapter 8.2 for more information on how to connect a
Bluetooth® device). Use one of the line input connectors to connect the audio
source.
1. Channel 1 audio source selector and mini-jack connector on front panel
o Dual RCA connector: connect your stereo sound source (CD player,
smartphone, radio tuner, streaming player, etc.) directly using a cable
that delivers the left (L) and right (R) channels to the unit's white and
red RCA connectors, respectively.
2. Rear panel input 1 RCA connectors
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INPUT 2 and INPUT 3: unbalanced stereo line inputs with RCA connectors.
Mono and balanced microphone inputs with 3-pin XLR connector. All of them
on the rear panel.
3. INPUT 2 and 3 connections on rear panel
o 3-pin XLR connector:
Hot or direct signal > Pin 2
Cold or inverted signal > Pin 3
Ground > Pin 1
4. 3-pin XLR connector
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INPUT 4: mono and balanced microphone input, with 3-pin XLR connector
on rear panel and COMBO connector on front panel. Unbalanced stereo line
input with RCA connectors on rear panel.
o COMBO connector:
XLR TRS jack
Hot or direct signal > Pin 2 Tip
Cold or inverted signal > Pin 3 Ring
Ground > Pin 1 Sleeve
5. TRS jack connector
On the rear panel of the unit, a PHANTOM ON/OFF switch allows supplying inputs 2
to 4 with phantom power (48 VDC) for microphones that require it, usually
condenser mics.
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8.2. Bluetooth® connection
eCOMPACT4BT has a Bluetooth® wireless audio connection (class 1, range approx.
25 meters in ideal conditions) through which you can connect mobile devices such
as smartphones or tablets for audio playback.
To connect:
1. On channel 1, select the Bluetooth
®
input, indicated by the logo, see
figure1. The PAIR LED will start flashing.
2. On your mobile device, go to the Bluetooth
®
settings, and select the
eCOMPACT4BT device. No PIN required to pair.
3. Once paired, the PAIR LED will stay on.
To unpair a device, press and hold the PAIR button for 2 sec. The Bluetooth®
connection will be available again to pair another device.
If you select the line input with the switch on channel 1 when a Bluetooth®
connection is established, the wireless connection will not be lost. With the switch,
you can re-select the channel 1 Bluetooth® input and the device will remain paired.
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8.3. Audio output connections
The eCOMPACT4BT has the following audio outputs, with the following connection
types:
MAIN OUT: main output. Balanced stereo line outputs with 3-pin XLR
connector on rear panel.
6. MAIN OUT connectors
o 3-pin XLR connector:
Hot or direct signal > Pin 2
Cold or inverted signal > Pin 3
Ground > Pin 1
7. MAIN OUT 3-pin XLR connector
Note: the circuit emulates a balancing transformer, so if you
want to use the MAIN OUT in unbalanced mode, the unused
output pin must be short-circuited to ground. Otherwise, the
output signal will not have the right level or quality.
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ALT OUT: alternative output or sub-mix. Unbalanced stereo line output with
RCA connectors on rear panel.
8. ALT OUT RCA connectors
SUB OUT: sub-bass or auxiliary output (monitor, zone, etc.). Balanced mono
line output with 3-pin XLR connector on rear panel.
9. SUB OUT sub-bass connector
NOTE: the circuit emulates a balancing transformer, so if you want to use the
SUB OUT in unbalanced mode, the unused output pin must be short-circuited
to ground. Otherwise, the output signal will not have the right level or
quality.
PHONES OUT: headphone output (marked with headphone symbol).
Unbalanced stereo output with 3.5 mm stereo mini-jack connector and
volume control for headphone listening. It is especially useful for listening to
the MAIN OUT signal of the unit without disturbing its normal operation.
The headphone volume control is located before the MAIN OUT volume
control.
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NOTE: adjust the headphone output volume to minimum before connecting
11. Balanced and unbalanced connections
the headphones to avoid damaging your hearing.
10. Front panel headphone output
If a balanced output channel is connected to an amplifier or audio device with
balanced input, the + (Pin 2), − (Pin 3) and (Pin 1) terminals must be connected
point to point between the two devices. If you connect a balanced output channel to
an amplifier or device with unbalanced audio input, leave the − terminal (Pin 3)
unconnected.
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8.4. Other connections
USB CHARGE: type-A USB port for connecting mobile devices. This port is
designed for device charging only (5 VDC). Very useful if you are using a
device connected to eCOMPACT4BT using Bluetooth® connection and need to
recharge the battery. This avoids having to connect the Bluetooth® audio
device to a distant power outlet at the risk of weakening the Bluetooth®
audio transmission.
12. USB charging port on front panel
RS-232 port: for troubleshooting by the authorized technical service. It has
no use for the user.
9. OPERATION AND USE
9.1. Start-up
Once all connections have been made, turn on the eCOMPACT4BT by pressing the
power switch located on the rear panel. The POWER LED will light green.
In a complete audio installation, it is important to power on the equipment
according to the following sequence: sound sources (microphones, music players,
etc.), mixers, audio processors and finally power amplifiers. To power off, follow the
reverse sequence. In this order, the transients produced by switching the devices on
or off will not affect the next ones in the chain, remaining inaudible.
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9.2. Monitoring
The eCOMPACT4BT is equipped with an audio and visual monitoring system
through headphones and VU meter.
The PHONES OUT signal is the same as that sent to MAIN OUT and SUB OUT (main
mix bus signal).
You can select the signal to be displayed on the VU meter between the main mix bus
signal (present on MAIN OUT and SUB OUT) and the ALT OUT mix bus signal.
9.3. Channel gain and equalization
These controls allow you to adjust input sensitivity level and tone for each channel
individually.
After connecting the various audio inputs, the GAIN controls of each input should be
used to obtain an optimal signal strength and maximum signal-to-noise ratio, so that
they can be used properly as sound sources in the installation. To do this, try to
maximize the volume controls of the audio players before adjusting the gain on the
eCOMPACT4BT. Use the level indicators on the front of the unit (VU meters) for
correct gain adjustment, ensuring that signal peaks are normally in the area near
0 dB (orange area in VU meters) and very exceptionally above it ("red" area,
saturation or clipping).
GAIN controls provide a ±30 dB adjustment range.
The 3-band tone controls (treble, midrange and bass) provide a ±30 dB range. Be
careful not to overload the speakers.
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9.4. Channel indicators
Each of the 4 input channels has two indicators. The green SP (Signal Present) LED
indicates the presence of a signal at the input selected with the active input selector.
If this LED does not light up when an audio source is delivering a signal, make sure
that the equipment has been properly connected, that the source you want to hear is
selected - channel source selection switches -, and/or that the GAIN control is
correctly adjusted.
The red CLIP LED indicates a risk of saturating the channel if the recommended
signal level is exceeded. This indicator may light up sporadically without risk to the
equipment but should never remain on continuously.
The PAIR button LED indicator shows the device pairing status:
The PAIR LED blinks: Pair mode enabled, the device is visible (from the mobile
device Bluetooth® adjustment settings) and ready to establish connection.
The PAIR LED is on: A Bluetooth® connection already done. The device is
paired.
The PAIR LED is off (but the eCOMPACT4BT device is on): CH1’s line input is
selected.
9.5. Talkover function
When the Talkover function is activated, the input signal selected for channel 4 has
priority over the main mix bus, i.e. when a signal is detected at the priority input
(signal level above threshold), the mix bus signal is attenuated at the MAIN OUT and
SUB OUT. ALT OUT is not affected.
9.6. Outputs
The eCOMPACT4BT has two independent outputs, with their own volume control:
MAIN OUT and ALT OUT. It also has a SUB-OUT sub-bass or auxiliary output, which
delivers a mono copy of the MAIN OUT signal.
The ALT OUT signal is taken from the mix bus before the Talkover function is
triggered, so there is no attenuation by the Talkover function. This output can be
used as a recording output – REC OUT – which may or may not include (using ALT
OUT SEND) the signal that triggers the Talkover function.
When manipulating the main output level of the mixing console, care must be taken
to ensure that the CLIP indicators of the connected power amplifiers are never
permanently lit, but at most at the rhythm of the lowest frequencies that reach them.
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10. CONSIDERATIONS
10.1. Ground loops
Always be careful not to interconnect grounds from the signal sources entering the
mixing console and from all devices connected to its outputs – ground must never
come from different devices, otherwise humming could occur and degrade the
sound quality.
The cable shields, if connected to the chassis, must never be connected to each
other. This prevents the formation of ground loops.
10.2. Background noise
The eCOMPACT4BT mixer has been designed to obtain the lowest possible
background noise. Regardless of the electronic design, the background noise will
directly depend on the correct use and installation of the unit.
Setting for example a channel FADER to "2" and the MAIN OUT VOL to "10" is not
the same as the opposite. In the first case, the signal entering the mixing amplifier is
weak, but even so it contains a background noise, so the signal/noise ratio is low
(low signal). When the output amplifier equally amplifies both parts as a whole, the
output has a very high background noise. In the second case, as the channel FADER
is set to maximum, the signal received by the mixing amplifier has a high level and
therefore also a high (good) signal/noise ratio, so when this signal reaches the
output VOL control and is amplified, the signal/noise ratio remains better than in
the previous case.
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11. BLOCK DIAGRAM
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12. TECHNICAL SPECIFICATIONS
INPUTS
Inputs Sensitivity and Input Impedance
LINE, LINE A, LINE B
MICRO (BAL)
AUX INPUT IN1
BLUETOOTH INPUT
0dBV/50kΩ
-35dBV/>1kΩ
-10dBV/316Ω
-10dBVFS
Frequency Response
LINE, LINE A, LINE B
MICRO (BAL)
AUX INPUT IN1
BLUETOOTH INPUT
10Hz÷30kHz -1dB
10Hz÷30kHz -1dB
10Hz÷30kHz -1dB
10Hz÷30kHz -1dB
Input Selector
INPUT 1
INPUT 2
INPUT 3
INPUT 4 (TALKOVER)
BLUETOOTH, LINE + AUX
LINE A, MICRO, LINE B
LINE A, MICRO, LINE B
LINE, MIC
Aux Input (on INPUT 1)
Connected to INPUT1 LINE
Gain Control
GAIN
± 15dB
Tone Control
BASS
MID
TREBLE
100Hz ±15dB
2kHz ±15dB
10kHz ±15dB
THD+N
LINE
MICRO
AUX
BLUETOOTH INPUT
<0.03%
<0.06%
<0.03%
<0.05%
Signal Noise Ratio
LINE
MICRO
AUX
BLUETOOTH INPUT
>100dB
>90dB
>100Db
>100dB
CMRR
BAL INPUTS
>75dB @ 1kHz
Micro 2-4 High Pass Filter
100Hz, -3dB – 2nd order
OUTPUTS
Output Level
MAIN OUT
SUB OUT
ALT OUT
HEADPHONES
0dBV
0dBV
0dBV
200mV
Output VU-meter
+6dB to -40dB, MAIN OUT or ALT OUT Selectable
Stereo / Mono
Functional only over MAIN OUT, SUB OUT and HEADPHONES
ALT OUT
Selectable by ALT OUT SEND buttons in each channel
SUB OUT
Low Pass Filter Externally
selectable
140Hz, -3dB – 3rd order
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13. PACKAGE CONTENTS
eCOMPACT4BT
3URMKIT included (rack-mount accessory)
External power supply
Adhesive feet for table-top installation
Quick User Guide and Warranty Card
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All product characteristics are subject to variation due to production tolerances.
NEEC AUDIO BARCELONA S.L. reserves the right to make design or manufacturing changes that may
affect these product specifications.
Motors, 166‐168 08038 Barcelona ‐ Spain ‐ (+34) 932238403 information@ecler.es www.ecler.com
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