Ecler PKUB250 User manual

USER MANUAL

MANUAL DE INSTRUCCIONES

NOTICE D'UTILISATION

BEDIENUNGSANLEITUNG

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INSTRUCTION MANUAL

1. IMPORTANT REMARK 04

1.1. Safety Precautions 04

2. INTRODUCTION 04

3. INSTALLATION 06

4. INPUTS 06

5. OUTPUTS 07

6. INFRARED REMOTE CONTROL 08

7. CONSIDERATIONS 08

7.1. Starting up 08

7.2. Gain and input levels 08

7.3. Equalization 08

7.4. SIGNAL indicators 08

7.5. CLIP indicators 09

7.6. VOLUME control knob 09

7.7. Auto-Standby function 09

7.8. MUTE - REMOTE LED indicator 10

7.9. Ground loops, background noise 10

7.10. Cleaning 10

8. FUNCTION LIST 11

9. FUNCTION DIAGRAM 11

10. CONFIGURATION DIAGRAM 39

11. TECHNICAL CHARACTERISTICS 40

12. BLOCK DIAGRAM 41

All numbers subject to variation due to production tolerances. ECLER SA reserves the right to make

changes or improvements in manufacturing or design which may affect specifications.

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1. IMPORTANT REMARK

Thank you for trusting us and choosing our PKUB amplified mixer. In order to obtain the

best performance and efficiency it's VERY IMPORTANT to carefully read and follow all

considerations specified in this manual before connecting the product.

In order to guarantee the optimum operation of this unit, we strongly recommend that its

maintenance be carried out by our Authorised Technical Services.

1.1. Safety Precautions

This apparatus must be earthed through its mains cable.

Do not expose the unit to rain or water splashes, and do not place liquid containers or

incandescent objects like candles on top of the unit.

Any change in the configuration of the unit must be carried out by a qualified technician.

Should any connection / disconnection task be done, always disconnect the unit from the mains

supply.

There are no user serviceable parts inside the unit.

2. INTRODUCTION

The PKUB is a professional two channel amplified mixer in a tabletop format, incorporating a

powerful Class-D stereo amplifier and a universal power supply.

The PKUB is a professional and compact solution for sound equipments of which end user

is not necessarily expert in audio equipment usage, since it offers simple power up and operation, like

those of domestic audio equipment. Also, its absolutely quiet operation as well as its particular format

and design make it perfect for use in obvious places, where classic professional equipment with a rack

format would not be suitable.

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These are its main features:

• Two-channel input mixer, with one MIC/LINE input and one LINE only input

• Class-D stereo integrated amplifier, 2 x 50W RMS @ 4 Ω

• Direct AUX IN (Channel 2) line input via a front panel mini-jack, ideal to connect iPod

®

type

players, mp3 players, multimedia players, etc. The same stereo connection is duplicated on

back panel for Channel 2 (RCA connectors)

• A Type A USB connector supplies power to charge batteries of iPod

®

type players, mp3

players, multimedia players, etc.

• Includes a Talkover function assigned to Input 1, with an internal recovery time selector

(see configuration diagram)

• Microphone sensitivity level can be adjusted with a back panel trimmer

• Internally switchable phantom power supply (+15V DC) for MIC (Channel 1)

• Level control for each input channel

• 3-Band tone controls on the back panel, independent for each input channel and adjustable

with a screwdriver

• Main output level rotary knob also working as a MUTE push button

• Output volume and mute remote control by means of the supplied infrared remote handset

• Line-level auxiliary output for a reinforcement subwoofer or another audio equipment

• Direct MIX IN input to the mixing "bus", allowing to connect external equipment, e.g.

another PKUB or a SAM type mixer

• General "MUTE" remote control by external contact closure, ideal for connection of fire

detection systems or any other safety device. Internally selectable as "NO / NC" (normally

open / normally closed).

• Back panel MONO/STEREO mode selector

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3. INSTALLATION

The PKUB is a professional mixer specially designed to be operated by non-technical users

and for tabletop usage. For this reason, its adjustments for microphone input sensitivity and tone

controls on each input are located on the back panel, and tone controls are adjustable with a

screwdriver only, therefore preventing the risk of unwanted operations.

Keep the unit far from noise sources (variable voltage regulators, motors, etc…) as well as

from power cables.

Also, you must not block ventilation opening with obstacles that could interfere with the

airflow of the equipment convection cooling.

The PKUB operates under voltages from 90 to 264 V at 47 to 63 Hz. This device features

an over dimensioned power supply that adapts to the mains voltage in any country of the world with

no need to make any adjustments.

In order to protect the unit from eventual overloads, the PKUB is protected by a timered

power fuse (25) of 4A. If it gets blown up, you must replace it with an identical one. NEVER REPLACE

THE FUSE WITH ANOTHER ONE WITH A HIGHER VALUE.

CAUTION: Fuse substitutions have to be performed by a qualified technician.

4. INPUTS

The PKUB INPUT 1 accepts two types of signal: MIC and stereo LINE. You can select one of

them with the back panel switch (14). On the back panel, a sensitivity knob and a MIC jack connector

handle microphone signals (level range: – 20 dBV to – 50 dBV) whereas stereo line signals are

connected to LINE RCA connectors, also located on the back panel.

INPUT 2 only accepts stereo line signals and has a front mini-jack connector and another

RCA type connector on the back panel.

MIC input allows balanced connection. In this case, the stereo 1/4" jack wiring has to be done

as indicated:

Live or direct signal > Tip

Cold or inverted signal > Ring

Ground/Earth > Sleeve

Microphones must be low impedance (200 to 600Ω) and monophonic. For NON balanced

connections, use monophonic jacks. It is also possible to make a non balanced connection with a

stereo jack connector by shorcircuiting the center ring to ground.

It supplies phantom power in order to use condenser microphones (positive on the tip and the

ring, negative on the sleeve). An internal jumper is used to switch it on/off. See configuration diagram

for more details.

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The AUX IN (INPUT 2) line input on a front panel mini-jack connector (6) is summed in

parallel with the same channel from the back panel. It has the following wiring:

L channel > Tip

R channel > Ring

Ground > Sleeve

Stereo LINE inputs accept line level signals from CD and DVD players, multimedia

devices, iPod

®

, MP3 players, radio tuners, TV receivers, etc. Turntables CAN NOT be directly

connected to this unit, because the PKUB has no RIAA preamp equipped input.

The line MIX INPUT is a direct access to the main mixing "bus". This input with 0dB (1V)

sensitivity is especially useful to interconnect e.g. two PKUB units or a PKUB and a SAM type mixer,

etc., therefore increasing the number of mixing channels and inputs.

5. OUTPUTS

The PKUB has a low impedance main amplified stereo output labelled OUT (20, 21) to

connect loudspeakers: 2 x 50 W RMS @ 4 Ω.

Use special care when setting the mixer general output level, VOLUME (5), so that CLIP

indicators never remain permanently lit in the upper part of the VU-meters bargraphs (9), but only (and

at the most) at the rhythm of the sound sequence lowest frequencies.

The PKUB has a non amplified stereo auxiliary output labeled SUB/AUX OUT (18) with RCA

connectors. Its output level is proportional to the equipment's general volume setting. Next to this

output, a MONO/ST selector allows to choose for this signal and the amplified outputs a monophonic

format (sum of L and R channels).

The PKUB allows to bridge outputs. In order to do this, simply press the back panel MONO

switch and connect the output as silk printed.

The PKUB incorporates a MUTE (22) remote control that can be activated by an external

potential free contact, affecting all inputs. This control is especially designed to connect fire

detection systems or any other safety device. It is internally selectable as "NO / NC" (normally open

/ normally closed) by means of a jumper. See configuration diagram for more details.

The MUTE front panel red LED indicator lights up whenever the unit is muted by the MUTE

external contact or by the user operating the MUTE control on the front panel or on the remote handset.

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6. INFRARED REMOTE CONTROL

The equipment includes as standard a remote control and its infrared detector to control

general volume and mute. Three keys control these functions:

• VOL UP (upward arrow)

• VOL DOWN (downward arrow)

• MUTE (crossed out speaker symbol)

Always try to point the remote handset directly toward the PKUB front panel REMOTE

detector, within range and preferably in front of it, without obstacles between them. The maximum

response distance for the emitting/receiving system depends on the incidence angle of infrared signals

on the receiver, on the battery load in the remote handset and on the existence of ambient interfering

signals, such as other infrared signals or emissions coming from certain types of fluorescent lamps.

7. CONSIDERATIONS

7.1. Starting up

This is directly done by means of the mains switch (24), the blue ON indicator (8) remaining

lit in blue on the front panel when the unit is powered on.

In a complete audio installation, it is important to start up the equipment in the following

sequence: sound sources, mixer, equalizers, active filters and finally power amplifiers. To turn them

off the sequence should follow an inverse pattern.

7.2. Gain and input levels

The PKUB has an effective adjustment system for the microphone input (channel 1)

sensitivity, allowing a precise matching to input levels. This system uses a back panel trimmer (15) for

this setting.

Also, two front panel rotary knobs (INPUT 1 and INPUT 2) allow to adjust the level of signals

sent from Input 1 and 2 to the mixing bus of the equipment for a later amplification that will be

proportional to the front panel VOLUME control setting.

7.3. Equalization

Tone controls (10, 11, 12) provide ±15 dB gain/attenuation for each of the three bands,

centered on 100Hz, 1.8kHz and 10kHz. Because of the intended applications of this unit, its tone

control system is adjustable by screwdriver, thus preventing unauthorised or unintentional use during its

normal operation.

7.4. SIGNAL indicators

The “SIGNAL” indicator (2) lights up to indicate a signal presence at inputs.

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7.5. CLIP indicators

“CLlP” indicators light up when the signal is near the real clipping (saturation) level. It is

normal for CLIP indicators to be lit at the bass frequencies rhythm for high operating levels, as these

frequencies have the higher energy content. You must take care that these indicators do not remain

continuously lit.

7.6. VOLUME control knob

The front panel VOLUME control knob has three functions:

• Adjusting the unit output volume, when you turn it

• Activating the unit's mute function, when you press it

• Deactivating the unit's mute function, when you press it again or turn it

The MUTE LED indicator lights up in red when the unit is muted.

Last volume setting is stored and at power-on the unit will be set to the same volume level as

when it was last turned off.

NOTE: if the unit is muted by the back panel MUTE external contact closure or opening,

all front panel and remote handset controls are deactivated. If MUTE is externally activated while the

device is already muted, the device remains muted after the end of the external activation.

7.7. Auto-Standby function

The unit automatically enters standby mode (low power consumption) after two minutes of

no input signal. In standby mode, the front panel ON LED indicator has a variable light intensity that

increases and decreases according to a slow cycle. In this mode, the other LED indicators are

permanently switched off.

The PKUB wakes up again in following conditions:

• An audio signal is detected on any input

• Any key of the remote control is pressed. Its assigned command is NOT executed

that time

• The volume is changed (UP/DOWN) or the front panel VOLUME control is pressed.

The assigned command is NOT executed that time

• A status change has been detected at the external MUTE input. The assigned

command IS executed

• Auto Standby can be deactivated with the back panel switch

If the unit was muted before entering the standby mode, the MUTE LED indicator is

switched off in standby mode and lights up when the unit is switched ON again.

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7.8. MUTE - REMOTE LED indicator

The MUTE LED indicator on the front panel also indicates when signals sent with the remote

handset are received by the infrared detector: it lights up in green when infrared signals are received

and in orange when you try to increase or decrease the volume beyond its maximum/minimum limits,

with the remote control or the encoder.

7.9. Ground loops, background noise

You must always avoid interconnected grounds between signal sources. It means grounds

must never arrive by two or more different ways, since this could produce "hum" ("ground loop") that

would even interfere with the sound reproduction quality.

Cable shielding, when connected to the chassis, must never be interconnected, so as to

avoid ground loops.

The PKUB amplified mixer has been conceived to obtain the lowest possible background

noise. Independently of the electronic design the background noise will directly depend on the

correct use and installation of the mixing unit.

I. e.: setting a channel VOL to "2" and the output to "10" is not the same as the other way

round. In the first case, the signal coming to the mixing amplifier - which has got its own noise - is low,

and so is the signal-to-noise ratio (low signal). When the output amplifier boosts the whole signal we will

get a very high background noise. In the second case - with the channel fader at maximum - the mixing

level is high, and so is the signal-to-noise ratio. When the signal reaches the VOL OUTPUT and is

boosted, it will keep a much better signal-to-noise ratio than in the preceding case.

7.10. Cleaning

The front panel should not be cleaned with dissolvent or abrasive substances because

silk-printing could be damaged. To clean it, use a soft cloth slightly wet with water and neutral liquid

soap; dry it with a clean cloth. Be careful that water never gets into the unit through the holes of the

front panel.

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8. FUNCTION LIST 9. FUNCTION DIAGRAM

1. Channel volume control

2. Visual indication, SIGNAL

3. Visual indication, MUTE

4. Remote control detector, REMOTE

5. Volume control, VOLUME

6. Line input, AUX IN

7. USB power supply, CHARGE

8. Visual indication, ON

9. VU Meter

10. Treble control, TREBLE

11. Mid control, MID

12. Bass control, BASS

13. Line input, LINE

14. Input selector, MICRO LINE

15. Input sensitivity adjustment, ADJ

16. Balanced microphone input, MICRO

17. Standby mode selector, AUTO STBY

18. Auxiliary output, SUB / AUX OUT

19. Mono-stereo switch, ST / MONO

20. Screwable terminal, OUT L

21. Screwable terminal, OUT R

22. Screwable terminal for remote mute, MUTE

23. Mix input, MIX INPUT

24. Mains OFF/ON Switch, O/I

25. Fuse holder

26. Mains socket

27. Unit mute switch

28. Volume up key

29. Volume down key

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10. CONFIGURATION DIAGRAM 10. DIAGRAMA DE CONFIGURACIÓN

10. SCHÉMA DE CONFIGURATION 10. KONFIGURATION

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11. TECHNICAL CHARACTERISTICS 11. CARACTERÍSTICAS TÉCNICAS

11. CARACTÉRISTIQUES TECHNIQUES 11. TECHNISCHE DATEN

Inputs Sensitivity nom/Impedance

LINE 1

0dBV/>10kΩ

MIC (BAL)

-35dBV/>1kΩ

LINE 2

0dBV/>6kΩ

IPod®

-10dBV/>300Ω

MIX

0dBV/>2kΩ

Input sensitivity adjust

MIC ADJ

±15dB

CMRR

MICRO (BAL)

>65dB @ 1kHz

Outputs Level/Minimum Load

SUB AUX

0dBV/10kΩ

Tone control

BASS

100Hz ±15dB

MID

1.8KHz ±15dB

TREBLE

10KHz ±15dB

Signal Noise Ratio

LINE

-80dB

MIC (BAL)

-75dB

Talkover

TIME

2 (1, 3) Seg*

EFFECT

-30dB

Phantom voltage

+15VDC/4mA max.

POWER 1kHz 1% THD

1 Channel @ 4Ω

52W

1 Channel @ 8Ω

31W

2 Channels @ 4Ω

33W

2 Channels @ 8Ω

27W

Bridged @ 8Ω

68W

Frequency response

20Hz - 25kHz (-1dB)

THD+Noise @ 1kHz Full Pwr.

<0.07%

S+N/N 20Hz -20kHz @ 1W/4Ω

>92dB

Damping factor 1kHz @ 8Ω

>140

Channel crosstalk @ 1kHz

>50dB

Mains

90-264VAC 47-63Hz

Power consumption (pink noise, 1/8 power @ 4ohm)

52VA

Power consumption (pink noise, 1/3 power @ 4ohm)

81VA

Dimensions WxDxH

132.5x155X142.5mm

Weight

1.5kg

*Internally selectable

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ECLER Laboratorio de electro-acústica S.A.

Motors 166-168, 08038 Barcelona, Spain

INTERNET http://www.ecler.com e-mail: inf[email protected]

50.0191.01.02

Ecler PKUB250 User manual

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