Phoenix ILA-450 User manual

ENGLISH
Instruction manual
Phoenix Professional Audio GmbH
Gewerbepark Conradty 12
D-83059 KOLBERMOOR
Tel. [phone]
Fax. [phone]-25
www.phoenix-pa.com
shop.phoenix-pa.com
[email protected]
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„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.
ILA-450 Version 010814
DOC-010814
Made in EU
For systems
according to
EN 60118-4
IEC 118-4
INDUCTION LOOP AMPLIFIER (LOOP AMPLIFIER) ILA-450
Now new with „MLC“-control to correct frequency errors, COMPRESSOR, control
of the loop impedance and SPEAKON output socket.

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Instruction manual
1. Read this manual carefully.
2. Keep this manual well.
3. Consider all warnings.
4. Follow all instructions.
5. ATTENTION: to avoid fires and electric shocks, this system may not be exposed to rain and humidity. Do not use
this device close to any waters.
6. Only clean it with a dry cloth.
7. Do not cover any air vents.
8. Do not put the device close to heat sources like radiators, hot air dampers, ovens or other devices (including am-
plifiers), which emit warmth.
9. Do not override the safety function of the inverse-polarity protection or the safety plug. A plug with inverse-polarity
protection has two pins, and one of them is wider than the other (only for USA/Canada). A safety plug has two pins and
one ground pole. When the included plug does not fit into your socket, the socket is obsolete and has to be replaced
by an electrician.
10. Pass the power cable in a way, that nobody can step onto it and that it cannot be jammed. This is especially valid
for plugs, sockets and the place where the cable comes out of the device.
11. Only use products and accessories specified by Phoenix Professional Audio GmbH.
12. Let maintenance operations only be carried out by qualified maintenance staff. The device has always to be
maintained, when it has been damaged in any way, f.i. when the power cable or the mains plug is damaged, if liquids
have been spilt onto the device or objects have been fallen into it, if the device has been exposed to rain or humidity,
if it does not work normally or if it has been fallen down.
The exclamation mark in a triangle shall advise the user of the existence of important
operating- and maintenance instructions in this manual.
The symbol consisting of a flash with an arrowhead in a triangle shall advise the user
of the existence of non-isolated, dangerous voltages within the housing, which can
be strong enough to give an electric shock.
ATTENTION: TO REDUCE THE RISK OF AN ELECTRIC SHOCK, DO NOT REMOVE
THE COVER. USE QUALIFIED STAFF FOR ALL MAINTENANCE OPERATIONS.
Important safety precautions and symbol explanation
EXPLANATION OF THE GRAPHIC SYMBOLS
2.
„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.

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Instruction manual
GENERAL
3.
The new redesigned ILA-450 is a loop amplifier as professional solution for the installation to loop amplifiers.
The ILA-450 loop amplifier for audio transmission is used extensively to supply hearing devices by inductive
audio signals.
The ILA-450 Phoenix induction loop amplifier has been developed as a high quality LOOP-amplifier for
medium induction loops.
The system is characterized particularly easy installation, customer-oriented operation and easy use of the
device at optimum performance.
Induction loop amplifiers are very often used in churches, cinemas, theaters, sales agencies, counters,
interpreter systems or DRIVE IN / DRIVE-THROUGH, so that hearing aid users under difficult acoustic
conditions (background noises, reverberation etc.) can hear much better without disturbing noises.
Advantages of the system:
By the inductive coupling of hearing devices the wanted signal (audio transmission) can be heard much
better without disturbing noises. By the transmission of an audio signal via the induction loop an acceptable
wanted signal/interference signal ratio is reached.
Useful information:
A purely acoustic, direct sound transmission (between speaker and hearing device) by reverberation and
background noises significantly deteriorates the perception of the wanted signal by the hearing device wearer.
Receiver ILA-E:
With the induction loop receiver ILA-E a loop system can be checked or maintained easily, fast and uncom-
plicated.
The device is especially suitable for responsible staff wherever the induction transmission is installed, or for
people who need a high quality „wireless“ hearing device without hearing aid, f.i. with channel interpreter
systems.
Planning of the loop design:
Not in every place where it would be desirable, acceptable resp. good conditions for installing the induction
loop can be found. Therefore in the planning phase it is necessary to examine a suggested place regarding
the following conditions:
- The magnetic interference fields of electric systems, f.i. heating systems in the floor or the roof area and
the electronic controls of lighting systems (particularly in cinemas, theaters etc.)
- The influence of magnetical or electrically conducting materials in the building structure, particularly in the
place where the loop shall be installed.
- The presence of further induction loops in the neighbourhood, which signals could interfere the planned
loops.
„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.


Instruction manual
4.
GENERAL
„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.
Unfortunately it is still common practise to assemble the 100 V power amplifiers with the additional audio
transformer.
Such systems are generally inaccurate as they show a disadvantageous frequency response. Such a system
configuration can increase the inductance with increasing frequency, so the high frequencies which are
important for the speech intelligibility cannot be radiated anymore.
Induction loop amplifiers do not have this disadvantage, therefore they are ideal to produce a constant field
strength by the use of dynamics processors and a special amplifier technology (constant current source).
Control
All important functions of the induction loop amplifier are controlled.
That means the ILA-450 induction loop amplifier controls its internal power amplifier, the functional effici-
ency of the connected induction loop with a pilot-tone pulse. Should a controlled function fail, the yellow
LED at the front side of the induction loop amplifier does not light and the fault contact „INFO LOOP OK“
[15VDC] will be currentless.
Compatibility according to EN 60118-4:
The most important feature with the redesign was the system compatibility to the standard EN 60118-4, so
a loop assembly based upon a „LOOP-SEGMENT“ system is possible.
In a „LOOP-SEGMENT“ system always two ILA-450 which form a magnetic field work together, thereby
on the entire area always a constant field strength of the magnetic field is reached.
The magnetic field outside the intended area quickly loses strength and drops to ZERO. This is done by
coupling a phase shift FS-1 which is connected between both ILA-450, which in turn produces a signal
phase difference of 90 degrees in the electric current by two adjoining induction loops.
Further instructions for loop installation by using a phase shifter FS-1 are described detailed in the further
chapter.

5.

Instruction manual
„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.
Before starting the amplifier ILA-450 we ask you to read the safety instructions carefully.
We ask you to carry out the installation according to the following guidelines:
In a clearly visible position a sign „INDUCTIVE COUPLING“ should be placed near the entrance to
the area where an induction loop is installed.
1 - Always put the amplifier onto a smooth and stable surface.
2 - Choose dry surroundings and do not put any liquids onto the amplifier.
3 - Avoid the proximity to heat sources.
4 - Never open the amplifier´s housing without pulling the mains plug out of the socket before.
5 - Only connect the device to 230 VAC mains voltage.
SAFETY INSTRUCTIONS
- Cooling element with a temperature-controlled fan control (internal)
- Short circuit protection - abnormal temperature protection - open circuit protection - overload protection
- LED level display „compressor“
- LED level display „output level“
- LED display loop detector „ERROR“
- LED display system monitoring „PROTECT“
- LED display „system POWER ON“
- SOFT START
- Balanced microphone/line inputs
- INSERT PORT in-/output
- SPEAKON connection for LOOP line
- Phönix connection for LOOP CONTROL
- Separate volume control for all inputs
- Countersunk volume controls, LF/HF-EQ controls
- MLC control at the front side ( „METAL LOSS CORRECTION“)
- Compression LED display 0 to 18 dB
- Output level LED display -12 to 0 dB
- Phantom power for inputs MIC.-1 and MIC.-2 and shiftable phantom power for input MIC./LINE3
- 19“ brackets can be demounted for table version
- Space saving 1 U housing version
- Monitoring of the loop impedance in the range from 0.5 Ohm to 3.0 Ohm
MAIN FEATURES

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Instruction manual
FRONT SIDE
6.
„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.
1 2 3 4 5 6 789 10 11
1.- MIC.-1
This control determines the sensitivity of the „MIC-1“ input.
2.- MIC.-2
This control determines the sensitivity of the „MIC-2“ input.
3.- MIC.-3/LINE
This control determines the sensitivity of the „MIC.-LINE-3“ input.
4.- COMPRESSOR
LED display (0 dB to 18 dB)
5.- LOW-EQ Filter (+-12dB)
Separate LF-control of the particular microphone- resp. LINE inputs.
Please select the DIP switch for input 3 between MIC.- and LINE sensitivity at the rear side.
6.- HIGH-EQ Filter (+-12dB)
Separate LF-control of the particular microphone- resp. LINE inputs.
Please select the DIP switch for input 3 between MIC.- and LINE sensitivity at the rear side.
7.- MASTER
With this control the electrical current flow of the loop can be adjusted.
8.- MLC-„METAL LOSS CORRECTION“
Control to correct frequency response errors which are caused by metals close to the induction loop.
Useful information:
Turn the MLC-control to reach the best tone (audio signal) on the induction loop, simultaneously listen to
the audio signal with ILA-E receiver via the headphones.
Repeat the measurement process for all induction loop amplifiers resp. induction loops ILA-450 which
are bound in the system.


Instruction manual
„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.
FRONT SIDE
1 2 3 4 5 6 789 10
9.- OUTPUT LEVEL
Output level LED display (-12 dB bis 0 dB) shows the current MASTER output level.
10.- PROTECT LOOP OK POWER
System fault indication with red LED.
When the PROTECT control display lights without input signal, possibly there are system oscillations or
other disturbances (f.i. the amplifier´s temperature is too high).
Disconnect the load and reduce the amplification to zero. If the LED continues to light, possibly the amplifier
has to be maintained.
IMPORTANT:
At system FAULT (PROTECT-LED lights) no output level and LOOP OK is displayed!
LOOP OK
Fault indication for loop impedance; should the LED light, the impedance of the induction loop is not within
the measuring range of 0.5 -4.0 Ohm).
IMPORTANT:
After elimination of the fault please always reset the loop amplifier ILA-450 by switching the amplifier off
with the POWER button, wait for 3 seconds and switch it on again with the POWER button.
POWER operation display.
LED lights, LOOP amplifier ILA-450 is activated.
11.- ON/OFF mains switch
11
7.


Instruction manual
„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.
REAR SIDE/CONNECTIONS
1 2 3 4 5 6 7 8 9 10
1.- MAINS INPUT TERMINAL 230VAC/50-60 Hz
230VAC mains input terminal. Connect the ILA-450 with the power cable to the network.
2.- LOOP CABLE
SPEAKON bush 2-poled, the loop line shall be connected with the clamps (+ Pin) and (- Pin).
3.- LINE OUTPUT [LINE-OUT]
Balanced audio signal output to JACK bush (max. 0 dB).
4.- INSERT
The INSERT bush is unbalanced connected and is used to connect external signal processing equipments
like f.i. additional EQ´s. When the plug is not inserted resp. no additional device is connected with INSERT,
the signal path is interconnected 1 to 1.
5.- AMLIFIER/LOOP CONTROL
Fault indicator output 15VDC, the contact remains isolated when the amplifier and the induction loop work
failure-free. The contact is supplied with 15VDC voltage as long as a system failure or loop failure is present.
6.- DC OUTPUT (+15VDC/-15VDC)
Balanced output voltage +/-15VDC, is used to connect a phase shifter FS-1.
7.- PHANTOM POWER/MIC.-LINE SWITCH
MODE-SWITCH PHANTOM. DIP- (ON) the input MIC.-/LINE 3 is supplied with 12VDC phantom power for
condenser microphones, DIP- (OFF) phantom power is deactivated.
MODE-SWITCH MIC.-LINE. With this switch you determine the sensitivity of the input MIC.-/LINE 3,
switchable between microphone level -50 dB and the line level -10 dB.
Useful information:
Always adjust the correct input sensitivity, otherwise instead of automated system a too high signal
level is reached at the input (position to MIC. and input signal with LINE level), so that the amplifier
cannot process the signal correctly and the signal can be reproduced distorted at the loop output.
8.


Instruction manual
„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.
REAR SIDE/CONNECTORS
1 2 3 4 5 6 7 8 9 10
8.- MIC.-/LINE 3 INPUT
The input is designed balanced (+2), (-3), (1-shielding).
The input sensitivity is adjusted at the device´s front side with separate control MIC.-/LINE 3 and adjusted
by the MODE-SWITCH No. 7.
9.- MIC.2 INPUT
The input is designed balanced +2, -3, 1-shielding. The input sensitivity of the input 2 is adjusted at the
device´s front side with separate control MIC. 2.
10.- MIC.1 INPUT
The input is designed balanced +2, -3, 1-shielding. The input sensitivity of the input 1 is adjusted at the
device´s front side with separate control MIC.1.
Useful information:
Unbalanced inputs: strip the insulation of the wire liners for
6 mm and connect them as shown with the clamps. The pin
in the middle has to be connected with the screen pin as
shown. Tighten the screws firmly.
1 GND
2 +IN
3 -IN
1 GND and wire link to 3
2 +IN
Balanced inputs: strip the insulation of the wire liners
for 6 mm and connect them as shown with the clamps.
Tighten the screws firmly.
9.


Instruction manual
„Copyright 2014, Phoenix Professional Audio GmbH, www.phoenix-pa.com“
Phoenix logo is registered at the German Patent- and Trademark Office (TM)
All brands are property of their respective owners.
TECHNICAL APPENDIX
To supply a perfect sound signal also to the users of hearing devices, so-called induction loops are installed.
Herewith the signal is transmitted inductively by a loop passed in the middle of the room into a receiver coil
which is located in the hearing device.
The induction loop has to be passed in a way that it encloses the intended area. The impedance of the loop
is approximately equal to the DC resistance.
When installing the loop into concrete, protective PVC pipe has to be used, IN NO CASE STEEL PIPE.
With difficult structural conditions prior to that a test loop has to be constructed and the supply has to be
checked.
INDICATION:
Directly above the loop wires the reception is worst, as there the flux lines run horizontally.
Cable cross-section Cable min. length Cable max. length
0.5 mm215 meter 90 meter
1.0 mm230 meter 130 meter
1.5 mm242 meter 160 meter
2.5 mm271 meter 180 meter
4.0 mm2115 meter 190 meter
CONSTRUCTION SIMPLE LOOP SYSTEM
A simple induction loop system consists of a LOOP amplifier ILA-450 and one or more induction loops of
the same size, see drawing.
ILA-450 LOOP- AMP ILA-450 LOOP- AMP
Drawing 1.1 shows single loop Drawing 1.2 shows double loop
10.