Aeta Audio Systems MIX2000 Manual de usuario

55 000 015 – Ed. E Mix2000 – User Manual

This document is the property of AETA and can not be duplicated without authorisation February 2001 Manuel Mix2000 (E) - Ed. E.doc

MIX2000

4 inputs portable mixer

User Manual

AETA AUDIO

361, avenue du Général de Gaulle – 92140 Clamart – FRANCE

Tél. +33 (0)1 41361212 – Fax +33 (0)1 41361213 – Telex 631178

Web : http://www.aetausa.com

55 000 015 – Ed. E Mix2000 – User Manual

This document is the property of AETA and can not be duplicated without authorisation February 2001 Manuel Mix2000 (E) - Ed. E.doc

Table of contents

1. Introduction .......................................................................................................................1

2. Functions ............................................................................................................................1

2.1. Input stages ................................................................................................................................... 1

2.2. Input channel processing .............................................................................................................. 1

2.3. Main channels (MASTER)........................................................................................................... 1

2.4. Outputs (MAIN and SUB)............................................................................................................ 2

2.5. Monitoring .................................................................................................................................... 2

2.6. Internal oscillator.......................................................................................................................... 3

2.7. Slate .............................................................................................................................................. 3

2.8. Monitor (MON) ............................................................................................................................ 3

2.9. Power supply ................................................................................................................................ 4

2.10. Miscellaneous ............................................................................................................................. 4

2.11. Digital output (option) ................................................................................................................ 4

3. Operating mode – Detailed description...........................................................................5

3.1. Left panel: “Inputs” ...................................................................................................................... 5

3.2. Front panel.................................................................................................................................... 6

3.3. Adjusting the bar-graph display.................................................................................................... 9

3.4. Right panel: “Outputs” ............................................................................................................... 10

3.5. Replacing the batteries................................................................................................................ 11

3.6. Using L/R <-> M/S matrixing .................................................................................................... 12

4. First level maintenance – Internal configuration .........................................................14

4.1. Internal description ..................................................................................................................... 14

4.2. Internal configuration (switches and jumpers) ........................................................................... 15

4.3. Internal adjustments.................................................................................................................... 18

5. Technical characteristics ................................................................................................21

5.1. Interface characteristics .............................................................................................................. 21

5.2. Internal characteristics................................................................................................................ 27

5.3. System performance ................................................................................................................... 27

5.4. Power supply .............................................................................................................................. 28

5.5. Dimensions and weight............................................................................................................... 28

5.6. Environment ............................................................................................................................... 28

5.7. Versions – Options ..................................................................................................................... 29

5.8. Accessories ................................................................................................................................. 29

6. Annexes ............................................................................................................................30

6.1. Overview of the M/S stereo technique .......................................................................................30

6.2. General synoptic diagram ........................................................................................................... 32

6.3. Gain and level diagram............................................................................................................... 33

55 000 015 – Ed. E Mix2000 - User Manual 1

This document is the property of AETA and can not be duplicated without authorisation February 2001 Manuel Mix2000 (E) - Ed. E.doc

1. Introduction

The MIX2000 is a portable mixer designed especially for outdoor recording (ENG). It is adequate for

cinema production as well, thanks to its audio performance and its M/S format handling capabilities.

The mixer features four symmetrical microphone/line inputs with microphone powering, and a stereo

output with limiter/compressor.

As noticeable highlights, the mixer features:

• Low weight and size (2 kg, 240 x 190 x 43 mm)

• Ultra-low noise (-126 dBu)

• Outstanding input headroom (56 dB)

• Fully M/S compatible

• VCA controlled master stage with selectable compressor and limiter

• 4 symmetrical inputs with selectable high-pass filters

• Wide scale LED bar-graphs with adjustable brightness

• High performance headphone amplifier with source and listening mode selection

2. Functions

The general synoptic diagram shows the functions of the mixer. It can be found in annex 6.2, General

synoptic diagram (page 32).

2.1. Input stages

Each input is symmetrical, transformer coupled.

Microphone powering can be inserted, in phantom mode or “ton-adder” mode1(12V). In phantom mode,

the power supply is 12V or 48V (internally configurable).

Line level is supported thanks to a –26 dB pad. For a microphone input, the input gain is adjustable by

6 dB steps over a 42 dB range.

2.2. Input channel processing

Each channel can be applied a selectable 12 dB/octave high-pass filter (Off / 80 Hz / 120 Hz cut-off

frequency), and phase inversion.

An LED indicates possible channel overload.

The channel feeds the two mixer buses through a channel fader and a panoramic potentiometer.

Each channel pair (1-2 or 3-4) can be coupled so that the even-numbered channel fader simultaneously

controls the level for both channels.

2.3. Main channels (MASTER)

The mixer buses feed the main outputs through VCA-based fader and balance adjustments.

1Not available on some equipment versions

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A limiter or compressor can be inserted in the Master channel. This limiter/compressor features two

selectable operating modes:

• Normal stereo mode, where the limiter/compressor applies same gain to both mixing buses;

• “Independent” mode, where each channel is processed separately, to be used when the main

outputs are used as two mono outputs. This mode can be selected by changing the internal

configuration (for such change, refer to chapter 4.2).

2.4. Outputs (MAIN and SUB)

The Master channels are available in symmetrical format on the MAIN outputs, with a –60 dB pad

separately selectable on each output.

The mixer buses are available in asymmetrical format on the SUB outputs, with a selectable –60 dB pad.

The output gain is adjustable in 6 dB steps thanks to a 6 position switch (0 to –30 dB attenuation from

normal gain).

It is possible to encode the MAIN outputs in M/S format (or decode to L/R stereo if the mixer is used for

recording with M/S stereo microphones). In such case, matrixing is applied as follows:

“Left” MAIN output = MAIN L + MAIN R (where MAIN L/R are the signals before matrixing)

“Right” MAIN output = MAIN L - MAIN R

2.5. Monitoring

A signal in the mixer can be selected for stereo monitoring on a headphone and a programme level meter.

The monitored signal can be selected among the following sources:

• Inputs 1 and 2;

• Inputs 3 and 4;

• SUB outputs;

• MAIN outputs;

• Return signal (from the “Monitor” interface).

In addition, a Solo push-button on each input channel enables direct pre-fader listening of this input.

When pressing the Solo button, the signal is monitored in mono mode (signal sent to both ears and both

meter channels).

The level meter is a wide scale (-40 to +8 VU) two-channel bar-graph display, on 16 LED per channel.

Depending on the internal configuration of the mixer, the level detection has VU or PPM ballistics. In

both cases, two level display modes are available:

• In the standard mode, the level is displayed in bar-graph (“thermometer”) mode, and the last peak

is held for a while on a separate dot (“peak-hold” function);

• In the “dot-only” mode, only the last peak is displayed (peak-hold). This mode can be used e.g.

for getting a more discreet display.

The level display also has adjustable brightness.

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Various listening modes are available on the headphone output:

• Normal stereo or reverse stereo;

• Right signal only or left signal only on both ears;

• Mono (left/right summing) mode, for checking mono compatibility, phase coherence, etc.

Last, M/S↔L/R matrixing can be used for monitoring. This is used for listening to a normal stereo signal

in the headphone while using M/S microphones1. As an alternate use, when the mixer is operated in

normal L/R stereo mode, M/S encoding of the monitored signal can be used for checking the stereo

correlation (checking the “S” signal level in relation with the “M” signal level).

Whenever used, matrixing is applied as follows:

“Left” matrix output = SIG L + SIG R (SIG L/R are the monitored signals before matrixing)

“Right” matrix output = SIG L - SIG R

2.6. Internal oscillator

An internal stereo oscillator is available for sound checking and alignment. The oscillator frequency is

1000 Hz on the left and 400 Hz (intermittent) on the right. By internal configuration, it is possible to have

1 kHz both on left and right channels. It is also possible to make the right signal permanent.

2.7. Slate

A talkback microphone, integrated in the mixer, can be used for inserting the operator’s voice on a mixer

output. Depending on the internal configuration of the mixer, the slate signal is inserted on one (or more)

of the following outputs:

• Left MAIN output;

• Left SUB output;

• Output to RF transmitter;

• Left MON output.

2.8. Monitor (MON)

The mixer features a MONITOR interface, typically used for intercommunication with a camcorder or a

control room (outside broadcasting applications, ENG). This interface includes the following signals:

• Stereo “MON OUT” output (MAIN signal);

• Stereo “MON Return” signal (input to the mixer for monitoring);

• Slate signal (output);

• “On-air” control input.

1If the MAIN signal has been applied M/S↔L/R matrixing at the output, the MAIN signal is automatically monitored with M/S

decoding, because the signal is picked up after the M/S↔L/R matrix.

55 000 015 – Ed. E Mix2000 - User Manual 4

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2.9. Power supply

The mixer operates from disposable or rechargeable batteries (8 AA-size batteries). It can be operated

from an external DC source as well.

The mixer can automatically switchover from one power source to the other, with no interruption or

noise.

2.10. Miscellaneous

The mixer includes a dedicated output for feeding a wireless RF transmission device, including power

supply for the RF transmitter.

Lastly, extension interfaces are available for coupling two (or more) MIX2000 mixers together, for e.g.

increasing the number of inputs.

2.11. Digital output (option)

The MIX2000 can be optionally1equipped with an analogue to digital converter (24 bit resolution). This

module converts the MAIN output signals and outputs a stereo digital signal, selectable in AES/EBU

format or SPDIF (IEC958).

The analogue MAIN outputs are still available when the “digital output” option is installed.

1This option is not displayed on the synoptic diagram

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3. Operating mode – Detailed description

3.1. Left panel: “Inputs”

This panel includes the input connectors and input settings. The “Monitor” interface is also available on

this side, including the interface connector and a potentiometer for adjusting the Monitor Return gain.

Figure 1 - Left panel – Inputs and Monitor interface

The following elements are available for each input:

• Input connector: female XLR;

• Microphone power selection switch: Dyn (dynamic microphone or line level); Ph. (phantom

power supply), T12V1(“Tonadder”);

• Pad switch;

• Input gain selection switch, with 8 positions.

Figure 2 - Input settings

1This selection is not available on some versions

55 000 015 – Ed. E Mix2000 - User Manual 6

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3.2. Front panel

The front panel includes the following zones, starting from the left:

• Input channels;

• Master section;

• Monitoring section

3.2.1. Input channels

The following picture shows the elements for channels 3 and 4, as an example.

Figure 3 - Input channels (3 and 4)

Notes:

• When the fader coupling switch is set in the rightmost position, channel fader #4 sets the gain for

both channels simultaneously, and channel fader #3 is inoperative. Of course, the same holds for

the “1+2” fader coupling switch with (respectively) fader #2 and fader #1.

• When pushing the SOLO button on a channel, the corresponding input signal is sent to both

monitoring channels, overriding the current monitoring source selection.

• The coloured text on the bottom reminds the panning of the input, depending whether the mixer is

operated in normal stereo mode (L/R green text) or in M/S mode (M/S red text).

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3.2.2. Master section

Figure 4 – Master section

Notes:

• The oscillator produces a continuous 1 kHz sine wave on the left channel and an intermittent

400 Hz sine wave on the right channel1. The oscillator can be activated either temporarily by

sliding up the oscillator switch (“On” position), or permanently by moving down the switch

(“Lock” position).

• When the master fader is set at the reference gain point (and the limiter/compressor is off), the

MAIN output has a 0 VU level when the internal oscillator is set on.

• Note that the master fader is located after the limiter/compressor on the signal chain (see general

diagram on page 32).

• The limiter/compressor is a stereo processor, but it is possible (internal configuration) to select

independent processing of the two channels.

• The MAIN output mode indicator switches to red when L/R↔M/S matrixing is activated on the

MAIN output, while it is green when no matrixing takes place.

1By changing the internal configuration, the right channel can be set at 1 kHz, and it can be permanent (instead of intermittent).

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3.2.3. Monitoring section

Figure 5 – Monitoring section

Notes:

• The “ON AIR” indicator is activated by the “On-air” control signal from the “Monitor” interface

(refer to 2.8, Monitor (MON));

• The M/S switch can be used for optionally matrixing the signal for monitoring, typically for

listening in normal stereo when using M/S microphones (see 2.5, Monitoring). A red LED is on

when the switch is activated. In such case, the action of the mode selector is indicated by red

coloured text near the selector.

• The LED above the power switch lights green when the unit is on. However, the LED flashes red

whenever the batteries are low (less than 8.8 V, or 1.1 V per battery), or the external DC power is

low (less than 12.8 V1).

• The Slate button can be used for activating the talkback microphone. The microphone is located

behind a small cavity in the front panel, just besides the “Slate” button.

• The button below the bar-graphs is used for adjusting the display mode and/or the display

brightness. The following chapter describes the instructions for using this button.

1Note that the threshold is different for the external power

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