Phoenix ILA-450 Instruction Manual

Phoenix Professional Audio GmbH Gewerbepark Conradty 12 D-83059 KOLBERMOOR Tel. 0049-(0)8031-30425-0 Fax. 0049-(0)8031-30425-25 www.phoenix-pa.com shop.phoenix-pa.com info@phoenix-pa.com

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Made in EU

Instruction manual

ILA-450 Version 010814

Now new with „MLC“-control to correct frequency errors, COMPRESSOR, control of the loop impedance and SPEAKON output socket.

For systems according to

EN 60118-4

IEC 118-4

ENGLISH

INDUCTION LOOP AMPLIFIER (LOOP AMPLIFIER) ILA-450

DOC-010814

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Phoenix logo is registered at the German Patent- and Trademark Ofﬁce (TM) All brands are property of their respective owners.

Instruction manual

Important safety precautions and symbol explanation

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 When the included plug does not ﬁt into your socket, the socket is obsolete and has to be replaced by an electrician.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.

EXPLANATION OF THE GRAPHIC SYMBOLS

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.

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Phoenix logo is registered at the German Patent- and Trademark Ofﬁce (TM) All brands are property of their respective owners.

Instruction manual

GENERAL

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 uncomplicated.

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.

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Phoenix logo is registered at the German Patent- and Trademark Ofﬁce (TM) All brands are property of their respective owners.

Instruction manual

GENERAL

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 efﬁciency 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.

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Phoenix logo is registered at the German Patent- and Trademark Ofﬁce (TM) All brands are property of their respective owners.

Instruction manual

SAFETY INSTRUCTIONS

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.

MAIN FEATURES

- 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

Instruction manual

Phoenix logo is registered at the German Patent- and Trademark Ofﬁce (TM) All brands are property of their respective owners.

FRONT SIDE

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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

Phoenix logo is registered at the German Patent- and Trademark Ofﬁce (TM) All brands are property of their respective owners.

FRONT SIDE

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1 2 3 4

5 6

9 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

+ 16 hidden pages

Phoenix ILA-450 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual