Phoenix ILA-450 User manual

™
ILA-450 —INDUCTION LOOP AMPLIFIER
Instruction manual
ILA-450
INDUCTION LOOP AMPLIFIER
Now with „MLC“ correction for frequency errors, COMPRESSOR, loop impedance monitoring
and SPEAKON output jack.
ENGLISH
DOC-050718
Made in EU
For Systems
according to
EN 60118-4
IEC 118-4
Phoenix Professional Audio GmbH
Gewerbepark Markfeld 5
D-83043 Bad Aibling / Germany
Tel.: [phone]
Fax: [phone]
www.phoenix-pa.com
www.phoenix-pa.com/shop
© Copyright 2018 Phoenix Professional Audio GmbH
www.phoenix-pa.com / www.phoenix-pa.com /shop
Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners

The exclamation mark in a triangle is intended to alert the user to the presence of
important operating and maintenance instructions in this manual.
The symbol consisting of a lightning bolt with an arrowhead in a triangle is intended to
alert the user to the presence of non-isolated, dangerous voltages within the housing
that may be strong enough to give off an electric shock.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE
COVER. USE QUALIFIED PERSONNEL FOR ALL MAINTENANCE WORK.
EXPLANATION OF GRAPHIC SYMBOLS
1. Read this manual carefully.
2. Keep this manual in a safe place.
3. Observe all warnings.
4. Follow all instructions.
5. WARNING: To reduce the risk of re or electric shock, do not expose this equipment to rain or moisture.
Do not use this device near water.
6. Clean only with a dry cloth.
7. Do not cover any ventilation openings.
8. Do not install near heat sources such as radiators, air vents, stoves or other equipment (including ampliers) that
radiate heat.
9. Do not override the safety function of the polarity reversal protection or earthing contact plug. A connector with polarity
reversal protection has two pins, one wider than the other (USA / Canada only). A safety plug has two pins and a ground
terminal. If the supplied plug does not t into your outlet, it will be outdated and must be replaced by an electrician.
10. Route the power cord so that nobody can step on it or get caught. This particularly applies to plugs, sockets and the
point where the cable exits the device.
11. Use only Phoenix Professional Audio GmbH products and specied accessories.
12. Have maintenance performed by qualied service personnel only. The device must always be serviced if it has been
damaged in any way, for example, if the power cord or plug is damaged, liquids have been spilled on the product, or objects
have fallen into the product, the product has been exposed to rain or moisture, is not working normally, or has been dropped.
© Copyright 2018, Phoenix Professional Audio GmbH, www.phoenix-pa.com
Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
IMPORTANT SAFETY INSTRUCTIONS & SYMBOL DECLARATION
ILA-450
Instruction manual
- 1 -
™

© Copyright 2018, Phoenix Professional Audio GmbH, www.phoenix-pa.com
Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
GENERAL INFORMATION
Instruction manual
- 2 -
ILA-450
™
The ILA-450 Induction Loop Amplier for audio transmission is widely used to provide hearing aids with inductive
audio signals.
The ILA-450 Phoenix Induction Loop Amplier was developed as a high-quality LOOP amplier for medium
induction loops.
The system is characterized by its easy installation and customer-oriented operation with optimal performance.
Induction loop ampliers are very often used in churches, cinemas, theaters, outlets, bank counters, interpreting
systems or DRIVE-INs or DRIVE-THROUGHs so that hearing aid wearers can hear much better in severe acoustic
conditions (background noise, reverberation etc) without disturbing noises.
System advantages:
Due to the inductive coupling of hearing aids, the useful signal (audio transmission) can be heard much better
without disturbing noises. By transmitting an audio signal through the induction loop, an acceptable signal-to-
noise ratio is achieved.
Useful Information:
A purely acoustic, direct sound transmission (between loudspeaker and hearing aid) due to reverberation and
background noises considerably worsens the perception of the useful signal by the hearing aid wearer.
Receiver ILA-E:
The ILA-E Induction Loop Receiver makes it easy to quickly and easily check or maintain a loop system.
The ILA-E loop receiver is used wherever an induction transmission is installed or particularly suitable for peo-
ple who need a high quality „wireless“ hearing aid without having to use a real hearing aid, such as in channel
interpreter systems.
Planning the loop design:
Not everywhere where it would be desirable acceptable or good conditions for the installation of the induction
loop can be found. Therefore, it is necessary in the planning phase to examine a proposed location in terms of
the following conditions:
- Magnetic interference of electrical systems, for example, heating systems in the oor or in the roof area and
electronic controls of lighting systems (especially in cinemas, theaters, etc.).
- Inuence of magnetically or electrically conductive materials in the building structure, especially where the loop is
to be laid.
- Presence of other induction loops in the neighborhood whose signals can interfere with those of the scheduled loops.

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Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
Instruction manual
- 3 -
ILA-450
™
Unfortunately, it is still common practice to equip 100 V power ampliers with the additional audio transformer.
Such systems are fundamentally wrong, since they have an unfavorable frequency behavior. Such a system
conguration increases the inductance with an increasing frequency, so that the high frequencies important
for speech intelligibility can no longer be radiated.
Induction loop ampliers do not have this disadvantage. Therefore, by using dynamic processors and special
amplier technology (constant current source), they are best suited for generating a constant eld strength.
Monitoring
All important functions of the ILA induction loop amplier are monitored.
This means that the ILA-450 induction loop amplier monitors its internal power output stage, the functiona-
lity of the connected induction loop with a pilot tone pulse. If a monitored function fails, the yellow LED on the
front of the induction loop amplier will not light up and the error contact „INFO LOOP OK“ [15VDC] will be
de-energized.
Compatibility according to EN 60118-4:
The ILA-450 induction loop amplier has been designed to be compliant with the EN 60118-4 standard, so
that a loop construction according to a „LOOP SEGMENT“ system is made possible.
In a „LOOP SEGMENT“ system, two ILA-450s always work together to form a magnetic eld. As a result, a
uniform eld strength of the magnetic eld is always achieved over the entire area.
The magnetic eld outside the intended range loses strength rather quickly and drops to zero. This is done by
coupling a phase shifter FS-1, which is connected between the two ILA-450, which in turn generates a signal
phase difference of 90 degrees in the electrical ow through two adjacent induction loops.
Further notes on loop laying with the use of a phase shifter FS-1 are described in detail in the following chap-
ters.
GENERAL INFORMATION

Before putting the induction loop amplier ILA-450 into operation, we ask you to carefully read the safety
instructions.
We ask you to perform the installation according to the following guidelines:
In a highly visible position, an INDUCTIVE COUPLING sign should be located near the entrance to the area
where an induction loop is installed.
1 - Always place the amplier on a at and stable surface.
2 - Choose a dry environment and do not put liquids on the amplier.
3 - Avoid the proximity of heat sources.
4 - Never open the case of the amplier without disconnecting the power plug from the socket.
5 - Only connect the device to 230 VAC mains voltage.
- Heat sink with a temperature-controlled fan control (internal)
- Short Circuit Protection - Overheat Protection - Open Circuit Protection - Overload Protection and
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 Input/Output (PORT for PHASES SHIFTER FS-1)
- SPEAKON connection for LOOP line
- Phoenix connection for LOOP CONTROL
- Separate volume control for all inputs
- Recessed volume controls, LF/HF EQ controls
- MLC control on the front („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 switchable phantom power for input MIC./LINE3
- 19“ brackets can be removed for table version
- Space-saving 1 U housing version
- Monitoring the loop impedance with audio signal
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Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
Instruction manual
- 4 -
ILA-450
™
SAFETY INSTRUCTIONS
KEY FEATURES

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-3“ input.
4.- COMPRESSOR
LED display (0 dB to 18 dB)
5.- LOW-EQ lter (+-12dB)
Separate LF control of the individual microphone or LINE inputs.
Please select on the back the DIP switch for input 3 between MIC and LINE sensitivity.
6.- HIGH-EQ lter (+-12dB)
HF-EQ control in the range (+/- 12 dB), HF control of the individual microphone or LINE inputs.
7.- MASTER
This control adjusts the electrical current ow of the loop.
8.- MLC-„METAL LOSS CORRECTION“
Regulator for correcting frequency response errors caused by metals near the induction loop.
Useful information:
Rotate the MLC control to get the best playback / transmission of the audio signal on the induction loop while
monitoring the audio signal via the headset with the ILA-E receiver.
Repeat the measurement procedure for all ILA-450 induction loop ampliers or induction loops bound in the
system.
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All trademarks are the property of their respective owners
Instruction manual
- 5 -
ILA-450
™
FRONT

1 2 3 4 5 6 789 10
9.- OUTPUT LEVEL
Output level LED indicator (-12 dB to 0 dB) indicates the current MASTER output level.
10.- PROTECT LOOP OK POWER
System fault indicator with red LED. If the PROTECT control indicator lights up without an input signal, there
may be system vibration or other interference (for example, the amplier temperature is too high). Disconnect
the load and reduce the gain to zero. If the LED remains lit, the amplier may need to be serviced.
IMPORTANT:
In the event of a system malfunction (PROTECT LED burning), no output level and „LOOP OK“ are displayed!
LOOP OK
Fault indication for loop impedance; if the LED is lit, the impedance of the induction loop is out of range (from
0.5 to 3.0 ohms) or there is no input signal.
IMPORTANT:
The loop impedance measurement only takes place when the input signal is inserted.
After removing the fault, always „reset“ the loop amplier ILA-450 by switching off the amplier with the
POWER button, wait 3 seconds and then turn it on again with the POWER button.
11.- ON/OFF power switch
POWER power indicator.
LED lights up, LOOP amplier ILA-450 is activated.
11
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All trademarks are the property of their respective owners
Instruction manual
- 6 -
ILA-450
™
FRONT

1 2 3 4 5 6 7 8 9 10
1.- POWER INPUT 230VAC/50-60 Hz
230VAC power input. For connecting the ILA-450 to the mains using the power cord.
2.- LOOP CABLE
SPEAKON socket 2-pin, the loop cable should be connected to the terminals (+ pin) and (- pin).
3.- LINE OUTPUT [LINE-OUT]
Balanced audio signal output to JACK socket (0 dB maximum).
4.- INSERT
The INSERT socket is unbalanced. It is used to connect external signal processing equipment such as additional
EQ‘s or FS-1 phase shifter. If the plug is not plugged in or if no additional device is connected to INSERT, the
signal path is bridged.
5.- AMPLIFIER/LOOP CONTROL
Fault signaling output 15VDC. The contact remains potential-free, if the amplier and the induction loop are
working without interruption. The contact is supplied with 15VDC voltage as long as there is a system fault or
loop fault.
6.- DC OUTPUT (+15VDC/-15VDC)
Symmetrical output voltage +/- 15VDC, used to connect a phase shifter FS-1.
7.- PHANTOM POWER SUPPLY / MIC.-LINE SWITCH
MODE-SWITCH PHANTOM.
DIP- (ON) —The MIC .- / LINE 3 input is supplied with 15VDC phantom power for condenser microphones.
DIP- (OFF) —Phantom power is disabled.
MODE-SWITCH MIC.-LINE. This switch determines the sensitivity of the MIC .- / LINE 3 input, switchable between
microphone level -50 dB and line level -10 dB.
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Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
Instruction manual
- 7 -
ILA-450
™
REAR SIDE / CONNECTIONS

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All trademarks are the property of their respective owners
Instruction manual
- 8 -
ILA-450
™
8.- MIC.-/LINE 3 INPUT
The input is balanced (+2), (-3), (1-shielding).
The input sensitivity is set on the front panel with separate MIC.- / LINE 3 control and MODE SWITCH no. 7.
Useful information:
Always set the correct input sensitivity, otherwise the input signal level will be too high (setting on MIC and
input signal with LINE level) so that the amplier can not process the signal properly and the signal is distorted
at the loop output.
9.- MIC.2 INPUT
The input is balanced +2, -3, 1-shield. The input sensitivity of input 2 is set on the front of the device with separate
controller MIC. 2.
10.- MIC.1 INPUT
The input is balanced +2, -3, 1-shield. The input sensitivity of input 1 is set on the front of the device with separate
controller MIC.1.
Unbalanced inputs: Strip the wire conductors by 6 mm and
connect them to the terminals as shown. The center pin
must be connected to the shielding pin as shown. Tighten
the screws.
1 GND
2 +IN
3 -IN
1 GND und wire bridge to 3
2 +IN
Balanced inputs: Strip the wire conductors by 6 mm
and connect them to the terminals as shown. Tighten
the screws.
REAR SIDE / CONNECTIONS
1 2 3 4 5 6 7 8 9 10

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All trademarks are the property of their respective owners
Instruction manual
- 9 -
ILA-450
™
In order to also provide users of hearing aids with a perfect sound signal, so-called induction loops are laid. In
this case, the signal is transmitted by inductive means of a laid-in-space loop in a receiver coil located in the
hearing aid.
The induction loop must be laid in such a way that it encloses the intended area of use. The impedance of the
loop is approximately equal to the direct current resistance.
When laying the loop in concrete, PVC protective pipe should be used, UNDER NO CIRCUMSTANCES STEEL
TUBE. In the case of difcult structural conditions, a test loop must rst be designed and the supply checked.
NOTE:
Directly above the loop wires the reception is worst, because the eld lines run horizontally there.
CONSTRUCTION SIMPLE LOOP SYSTEM
A simple induction loop system consists of a LOOP amplier ILA-450 and one or more equal size induction
loops, see drawing.
ILA-450 LOOP- AMP ILA-450 LOOP- AMP
Figure 1.1 shows single loop Figure 1.2 shows double loop
Wire cross-section Min. cable length Max. cable length
0.5 mm215 meters 90 meters
1.0 mm230 meters 130 meters
1.5 mm242 meters 160 meters
2.5 mm271 meters 180 meters
4.0 mm2115 meters 190 meters
TECHNICAL APPENDIX

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Instruction manual
- 10 -
ILA-450
™
Please lead parallel lines close together.
A signicantly better result (constant eld strength) than with single loops is achieved by laying LOOP SEGMENT
loops. The individual segments must be the same size, the distances should be between 2 meters and 5 meters.
Application examples: rows of seats in the theater, church, schools, etc.
IMPORTANT:
Disadvantage of a LOOP SEGMENT loop without phase shifter:
Wherever two loop lines run parallel, the eld strength is equal to „0“! The area of the „0“ eld strength can be
between a few centimeters to one meter.
IMPORTANT:
Rooms and areas where an induction loop has been installed should be marked accordingly.
CONSTRUCTION SIMPLE LOOP SYSTEM

The example shows an induction loop with limitation of the induction eld to the adjoining room. The additional
limiting loop is mainly used where a space division by e.g. plaster boards has been performed where two
independent variable loops are to be processed with different audio signals.
The length of the additional turn of the limiting loop should be in the ratio of about 1:11.
Details are referring to a square space!
IMPORTANT:
Rooms and areas where an induction loop has been installed should be marked accordingly.
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All trademarks are the property of their respective owners
Instruction manual
- 11 -
ILA-450
™
LOOP SYSTEM WITH DELETION OF THE MAGNETIC FIELD

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Instruction manual
- 12 -
ILA-450
™
The best result (constant eld strength) is achieved by laying a „DOUBLE LOOP SEGMENT“ with phase shift.
Compatibility according to EN 60118-4.
Such double LOOP SEGMENT induction loops are recommended for large areas and with large induction eld
inuence by metallic objects (walls and oors) in the concrete.
Application examples: large churches, exhibition halls, railway stations, schools, etc.
Since the laying of the double LOOP SEGMENT induction loop is associated with quite a lot of effort, this type
of induction loops is usually only possible in new buildings or with general renovation of buildings.
The advantage of the DOUBLE LOOP SEGMENT induction loop is the up to 4 times lower loss of the induction
eld (low power - large area).
For dual LOOP SEGMENT induction loops, the audio signal is connected to the rst ILA-450 LOOP amplier.
This in turn supplies the rst loop in the system.
Due to the phase modulation, the audio signal is shifted by 90˚ phases and forwarded to the second ILA-450.
The second ILA-450 then has to supply the second parallel induction loop throughout the system. All LOOP
segments should be equal and should not exceed ranges of 2 to 5 meters.
Compatibility according to EN 60118-4
In a „LOOP SEGMENT“ system, two ILA-450s are always working together to form a magnetic eld.
As a result, a uniform eld strength of the magnetic eld is always achieved over the entire surface.
The magnetic eld outside the intended range loses strength rather quickly and drops to zero. This is done by
coupling a phase shifter FS-1, which is connected between the two ILA-450, which in turn generates a signal
phase difference of 90 degrees in the electrical ow through two adjacent induction loops.
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4
f
Re
Im

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All trademarks are the property of their respective owners
Instruction manual
- 13 -
ILA-450
™
Example of a simple LOOP SEGMENT induction loop system with two ILA-450 (MASTER / SLAVE) and
FS-1 90 degree phase shifters. It is important that the induction loops are approximately the same size.
ILA-450 LOOP- AMP
ILA-450 LOOP- AMP
MASTER 0oSLAVE 90o
System with single loops
System with several loops „COMB-SYSTEM“
ILA-450 LOOP- AMP
ILA-450 LOOP- AMP
MASTER 0o
SLAVE 90o
MASTER 0o
SLAVE 90o
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4

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Instruction manual
- 14 -
ILA-450
™
Example of a multiple LOOP SEGMENT induction loop system with (MASTER / SLAVE) conguration to cover
very large areas of constant magnetic eld strength.
Important information:
It is important that the induction loops MASTER and SLAVE are approximately the same size and have a width
of approx. 50 - 66% of the loop length.
System components:
4 x ILA-450 Induction loop amplier
2 x FS-1 90oPhase shifters
ILA-450 LOOP- AMP
ILA-450 LOOP- AMP
ILA-450 LOOP- AMP
ILA-450 LOOP- AMP
MASTER 0o
SLAVE 90o
SLAVE 90o
MASTER 0o
IMPORTANT:
Rooms and areas where an induction loop has been installed should be marked accordingly.
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4

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Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
Instruction manual
- 15 -
ILA-450
™
Due to the phase modulation, the audio signal is shifted by 90˚ phases and forwarded to the second ILA-450 or
to the second induction loop. The second ILA-450 then has to supply the second parallel induction loop in the
entire inductive hearing aid system.
The rst LOOP amplier of the entire induction loop system works without phase shift with 0˚.
The rst ILA-450 supplies the rst parallel induction loop in the entire inductive hearing aid system.
In a „LOOP SEGMENT“ system, two ILA-450s are always working together to form a magnetic eld. As a result,
a uniform eld strength of the magnetic eld is always achieved over the entire area.
The magnetic eld outside the intended range loses strength rather quickly and drops to zero.
This is done by coupling a phase shifter FS-1, which is connected between the two ILA-450, which in turn cau-
ses a signal phase difference of 90 degrees in the electrical ow through two adjacent induction loops.
LOOP 0oLOOP 90o
ILA-450
MASTER
ILA-450
SLAVE
FS-1
PHASE SHIFTER
AUDIO
INPUT
+/-15VDC
INSERT
INSERT
INSERT „A“
INSERT „B“
Phased Array System
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4

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Instruction manual
- 16 -
ILA-450
™
MASTER 0o
SLAVE 90o
FS-1 network side
SIGNAL INPUT
Phased Array System
LOOP SYSTEM WITH 90 DEGREES PHASE SHIFT according to EN 60118-4

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Instruction manual
- 17 -
ILA-450
™
MATHEMATICAL CALCULATION OF INDUCTION LOOPS
Induction loop type calculation: double LOOP SEGMENT
1.- First the room length is set (less 10-20 cm of the total length for other installations).
2.- Please set the preferred segment width (between 2 meters and 5 meters, depending on eld loss).
3.- Now the coefcient „X“ can be calculated.
„L“= room length
„S“= preferred segment width
From the table in column „G“, please take the value closest to the calculated value „X“.
The coefcient values P 1 and P 2 indicate the number of segments for both loops.
Calculation of segment width „A“
„L“= room length
„G“= value closest to the calculated value „X“
Calculation of the distance between two segments „B“
Calculation of the shift between the two loops „C“
X= L
S
A= L
G
B=1.6 xA
C= B
2
2.6
3.4
4.2
5.0
5.8
6.6
7.4
8.2
9.0
9.8
10.6
11.4
12.2
13.0
13.8
14.6
15.4
16.2
17.0
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
G P 1 P 2

Calculation example:
Space measuring 25 meters x 8.0 meters; the preferred segment width is 3.0 meters.
„X“ should be calculated:
From the table in column „G“ we take a value of 8.2
The coefcient values P 1 and P 2 show:
P 1 =5
P 2 =5
„A“ should be calculated:
Now the exact distance at the beginning of the two loop segments „B“ / „A“ should be calculated:
Calculation of the shift between the two loops „C“:
X=L
S=25
3 =8.3
A=L
G=25
8.2=3.05 (meters)
B=1.6 xA=1.6 x3.05=4.88 (meters)
C= B
2=4.88
2 = 2.44 (meters)
2.6
3.4
4.2
5.0
5.8
6.6
7.4
8.2
9.0
9.8
10.6
11.4
12.2
13.0
13.8
14.6
15.4
16.2
17.0
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
G P 1 P 2
Instruction manual
- 18 -
ILA-450
™
© Copyright 2018, Phoenix Professional Audio GmbH, www.phoenix-pa.com
Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
MATHEMATICAL CALCULATION OF INDUCTION LOOPS

Drawings show the laying of the two calculated induction loops from the example calculation.
Induction loop no. 1 (the rst ILA-450)
Induction loop no. 2 (the second ILA-450)
Induction loop „total“ (the rst ILA-450 and the second ILA-450 induction loop ampliers in the system)
Instruction manual
- 19 -
ILA-450
™
© Copyright 2018, Phoenix Professional Audio GmbH, www.phoenix-pa.com
Phoenix logo is registered with the DE Patent and Trademark Ofce (TM)
All trademarks are the property of their respective owners
MATHEMATICAL CALCULATION OF INDUCTION LOOPS