Itec MULTIMIX 8/4 DIGITAL Guide

MULTIMIX 8/4 digital
MANUAL VERSION 3.0, AUGUST 2007
PART 1: HARDWARE DESCRIPTION
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Dear customer!
It is the most important goal of our development endeavours to produce practice-orientated
devices that make work easier; this applies, on the one hand, to the end user who needs to
come to terms with the device, and, on the other hand, to the engineer and technician who
install the product and set its functions according to the customer’s requirements. Many
years of experience in the field of sound reinforcement installations have taught us the main
requirement: a multi-functional device allowing all kinds of signal adjustments to the
technician and offering an easy-to-use control surface to the person running the device.
The ITEC-MULTIMIX 8/4 digital fulfils this requirement to perfection. With his PC, the
technician can easily configurate the device as requested and implement a wide variety of
sound effects without using additional devices. The end user receives an easy-to-grasp and
easy-to-use sound system. Adjustments can be made only within the predetermined limits,
thus eliminating operating mistakes to a large extent.
The configuration software ITEC-MixDesign is easy to survey and understand, and can
consequently be operated effortlessly by anybody.
You can store up to 15 different complete configurations in the Multi-Mix’s flash and switch
(load) them externally according to the occasion.
In contrast to comparable products, the ITEC-MULTIMIX 8/4 is an analogue mixer in its
paths (with the exception of the optional DSP output module)! However, it is fully digitally
controlled. The processors control and adjust the VCAs, measure level and transmitter, and
switch the signals.
The analogue basic concept is the decisive factor for the extraordinary quality, particularly in
respect to signal to noise ratios, dynamics, and the distortion factor of small signals.
Please pay attention to the installation and configuration instructions in this manual of the
ITEC-MULTIMIX 8/4 digital, so that you can make the most of this device.
Your ITEC acoustics team

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CONTENTS: PART 1
HARDWARE DESCRIPTION
Dear customer!.......................................................................................................................2
SAFETY PRECAUTIONS........................................................................................................4
SUPPLY EXTENT...................................................................................................................5
PART 1: HARDWARE DESCRIPTION ................................................................................6
FRONT PANEL CONTROLS and DISPLAY.......................................................................6
1) Power indicator:........................................................................................................................... 6
2) Multifunctional LED display:........................................................................................................ 6
3) Potentiometers 1- 8:.................................................................................................................... 7
4) PC interface:................................................................................................................................7
5) Device Status:............................................................................................................................. 7
PLUGS and SOCKETS of the REAR PANEL ....................................................................8
6) Ground Lift:.................................................................................................................................. 8
7) Power supply socket: .................................................................................................................. 8
8) External control inputs:................................................................................................................ 9
8 a) External potentiometer:............................................................................................................ 9
8 b) External configuration switching:............................................................................................ 10
9) Interface for media remote control:........................................................................................... 11
10) Digital Link:.............................................................................................................................. 11
11) Analog Link:............................................................................................................................. 11
12) Inputs:...................................................................................................................................... 12
13) Outputs:................................................................................................................................... 12
14) Optional LAN-module:............................................................................................................. 13
15) Device Status Output: ............................................................................................................. 13
Optional Input Equalizer......................................................................................................13
MULTIMIX 8/4 BLOCK DIAGRAM........................................................................................14
Optional 4x4 DSP-Matrix......................................................................................................15
DSP BLOCK DIAGRAM ....................................................................................................15
Installing and removing Modules .......................................................................................16
Installing the DSP Module................................................................................................16
Removing the DSP Module..............................................................................................17
Installing the Input-Equalizer Module.............................................................................18
Removing the Input-Equalizer Module ...........................................................................19
Installing/Removing the LAN Module .............................................................................19
SPECIFICATIONS:................................................................................................................20

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SAFETY PRECAUTIONS
The installation and configuration of the ITEC-Multimix 8/4 must be carried out solely by
trained experts. For the configuration use exclusively the original software ITEC-MixDesign.
You must only use the original power supply, which has on its primary side an IEC power
inlet C14 and which is to be connected to the mains socket customary in your country (115 –
230V) with an adequate cable.
When installing the device into a closed cabinet, make sure that there is sufficient air
circulation in order to avoid an inadmissible heating of the device.
When connecting other devices (sound sources, PC), make sure you pay attention both to
the right connection as well as to the input and output specifications.
Do not try to open the device forcefully or by undoing the screw joints. It does not contain any
parts that can be repaired by a layman. In case of problems please contact the manufacturer
or your regional sales office.
By no means must the device be exposed to temperatures above 50°C, humidity above 95%
or rain.
Attention: unplug the power supply any time the device is opened by an expert.

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SUPPLY EXTENT
ITEC-Multimix 8/4 digital
Power supply with connection cable
Manual (English or German)
optional:
4x4 DSP-Modul (built in)
Input equalizer (built in)
Accessories:
ITEC-MM-PC-1.5 RS-232 to PC connection cable
ITEC-MM-PC-1.5 opto PC connection cable with a galvanically separated interface
ITEC-MM-RJ-0.5 Analog-Link-Kabel
The standard phantom power of the inputs is 12 Volt. For a higher phantom power you need:
ITEC-MM-Ph-48V plug module for 48 Volt phantom power
ITEC-MM-Ph-24V plug module for 24 Volt phantom power
ITEC-MixDesign configuration software:
You will always find the latest version for a free of charge download under:
http://itec-audio.com/download/mixer/mixersetup.exe

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PART 1: HARDWARE DESCRIPTION
FRONT PANEL CONTROLS and DISPLAY
Hardware 2.1
Hardware 1.0 to 2.0
1) Power indicator 4) PC-Interface
2) LED-Display 5) Device Status
3) POTIS 1-8
1) Power indicator:
A red LED shows that the operation voltages are in order.
2) Multifunctional LED display:
Depending on the configuration (see software description), the 8 LEDs have the
following functions:
Off: LEDs are switched off.
Signal:* input signal at corresponding input (post-fade) is higher than - 60 dB.
Comp:* indicates a Compressor/Limiter activitiy on the corresponding input.
Clip:* input signal at corresponding input (post-fade) is higher than + 3 dB.
Value: level display for one input or output (one LED is equivalent to 10 dB).
*When running on „Auto-switcher“ the LEDs show the active channels (microphones).
If the display if configured to display a Value, you can determine the current level with the
following table:
LED no 1 2 3 4 5 6 7 8
Value greater or equal -55dB -50dB -40dB -30dB -20dB -10dB -0dB +10dB
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3) Potentiometers 1- 8:
A considerable advantage of the ITEC-MultiMix is the manual controllability of the volumes
in a most simple form, namely by means of the potentiometers on the front panel. This is the
only way of realising a really user-friendly stand-alone solution. The 8 volume controls can be
allocated individually; and you can also control several inputs by one control only(e.g. stereo
sources: contro the left and right channel by one pot only).
The potentiometer’s scale shows, apart from the usual 0 - 10 inscription, also dB statements.
The correlation is:
7
These figures refer to an attenuation, in relation to the predetermined maximum
amplification.
Example 1: An input is preset at an amplification of +45 dB (microphone).
The potentiometer is at 7.
The total amplification is: +45 - 15 = +30 dB.
Example 2: several control elements have been chosen for this input (see software
description „basic configuration“):
The potentiometer is at 7.
The external potentiometer is at 8.
Preset is at 9.
The total amplification is: +45 - 15 - 10 - 5 = +15 dB.
4) PC interface:
The 9-pole Sub-Min-D-plug on the front panel (RS 232 PC) is to be used exclusively for
connecting a PC or laptop with ITEC-MixDesign software.
A suitable connection cable is the ITEC-MM-PC-1.5 (available accessory).
You can use any Nullmodem cable, also known as “AT-Link Cable“.
If your Laptop hasn´t got any serial interface, you can also use a “USB-to-serial” converter,
which are full supported by the software. Take a look at
http://www.qbik.ch/usb/devices/showdevcat.php?w=d&id=15
When connecting a laptop supplied with a switching power supply you may get audible
interferences. This can be avoided by using the galvanically separated interface cable
ITEC-MM-PC-1.5-opto.
5) Device Status:
The device continuously monitors itself and indicates a possible device failure caused by
various internal faults. The reason for a device fault can be determined from within
MixDesign. See also Device Status Output
1 ..... -60 dB 6 ….. –20dB
2 ..... -40 dB 7 ….. –15dB
3 ..... -35 dB 8 ….. –10dB
4 ..... -30 dB 9 ….. –5dB
5 ..... -25 dB 10 …. 0dB

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PLUGS and SOCKETS of the REAR PANEL
Hardware 2.1
Hardware 1.0 to 2.0
6) Ground lift 10) Digital link 14) Ethernet Port
7) Power supply 11) Analogue link 15) Device Status Output
8) External control inputs 12) inputs 1 - 8
9) Media remote control interface 13) outputs 1 - 4
6) Ground Lift:
Rocker switch on the housing rear panel, called “GROUNDLIFT”.
Connects/separates the electronics ground with/from the housing ground.
A separation may be necessary to avoid ground loops if the housing already has ground
contact (metal rack, connection with power amplifier).
1 ..... electronics ground and housing are connected.
0 ..... electronics ground and housing are not connected.
7) Power supply socket:
6-pole DIN-socket on the housings rear panel, called ”DC POWER IN“
The original power supply unit is to be connected with the DIN-socket. The connection
diagram is:
1 ....... GND
2 ....... GND
3 ....... + 5 Volt
4 ....... - 12 Volt
5 ....... + 12 Volt
6 ....... phantom power
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The voltage for phantom power on pin 6 is 12 Volt. By using the plug modules
ITEC-MM-Ph-24 and ITEC-MM-Ph-48 respectively you can achieve higher phantom
voltages.
Attention: When using 48 Volt phantom voltage, short-circuiting the input signal wires on
ground must be avoided.
8) External control inputs:
15-pole Sub-Min-D-socket on the housings rear panel, called ”EXT.CONTROL“.
volume remote control:
A simple volume remote control becomes possible by using the control inputs „External“.
The 8 control inputs can be activated with external potentiometers and a control DC of
0 -10V respectively. It is your choice (see software description) which input channels you
decide to control.
Configuration change:
The same socket houses the control inputs for a configuration switch. External switch
contacts activate one of the 15 predetermined settings.
Socket allocation:
1….External1 9 …External2
2….External3 10…External4
3….External5 11…External6
4….External7 12…External8
5.... +10 Volt 13…GND
6....Config.1 14...Config.2
7....Config.4 15...Config.8
8....GND
8 a) External potentiometer:
EXTERNAL POTENTIOMETERS
Ext pot 1
Ext pot 8
9

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Input resistance: 40 kOhm
We recommend the use of linear potentiometers 1 k or 5 k.
With long wirings you need to use shielded cables (as shown in the illustration).
When using linear potentiometers and a scale of 0 – 10, you can determine the influence of
the external controls according to the calculation method mentioned in item 3.
8 b) External configuration switching:
The control inputs for changing the configuration are BCD-coded.
The inputs are preset at 5V with an internal pull-up resistance (4k7), hence their inactive
condition is „logically 1“. The switch takes place by changing to 0 Volt.
config.no conf8 conf4 conf2 conf1 config.no conf8 conf4 conf2 conf1
#1 1 1 1 0 #5 1 0 1 0
#2 1 1 0 1 #6 1 0 0 1
#3 1 1 0 0 #7 1 0 0 0
#4 1 0 1 1 #8 0 1 1 1
The switch will become effective only if and when it is cleared by the software (see software
description „edit“ / „project preferences“ and „tools“ / „enable configuration“ respectively).
With configuration #0 (no switch is activated, all inputs are at „1“) the device chooses the
preset start configuration (see software description). In this condition the switch can be
executed via the PC.
Choosing a non-defined configuration does not cause any changes.
Configuration change with selector switch:
Rota
ry selector switch
10