AUSTRALIAN MONITOR KLA Bedienungsanleitung

Australian Monitor

Ktu

K snnlns LooP AMPLIFIERS

Introduction

Australian Monitor is proud to introduce to you its range of lnduction Loop amplifiers. Modelled on

the successful K-Series range, these amplifiers utilise our unique impedance and phase sensing

system to provide a constant cunent into a single turn lnduction Loop, resulting in clarity and

detail whilst maintaining total stability.

Hosting most of the features and protection networks of the K-series Audio Amplifiers the KLa

loop amplifiers offer some additional circuitry, controls and lndicators to assist in the conect set-

up of an lnduction loop system.

These include: lntemal limiter with 250mV threshold and front panel indication

10dB into compression indicator

lnput Level Control for adjusting input signal for the ideal operating window

Dual level output cunent indicators

Low frequency output current limiting (and indication)

, Loop disable relay at turn on

Loop open / voltage too high indication

Binding Post and Speakon loop connections

Active Balanced lnputs

Signal Ground "LlFT" switch.

Additional features include: Custom designed - heavy duty chassis, open modular

construction for ease of servicing, well regulating high current power supply, lnput signal

strapping connectors, massive heatsinking, Front to back cooling and a dual speed axial fan.

Protection features include: Mainrs inrush cunent suppression, lnput muting at tum on, lnput

over-voltage protection, RF interference suppression, Short-circuit protection, Mains Circuit

Breaker, lndependent DC supply rail Fuses.

The layout, grounding, decoupling and componentry have been optimised to provide the user with

stability, reliability and longevity.

ltu Austdlan Monitor

KLa Loop Amplifiers 2

Front Panel Controls and Indicators

Your KLa loop amplifier is furnished with simple controls and indicators to assist in the set up of

the amplifier for driving a properly calculated lnduction Loop. The indicators provide visual detail

to show the proper operating levels of input signals and output current.

1 Input Level Control.

A "lnput Level" attenuation control is provided so as to adjust your incoming signal to a level

suitable for processing by the internal limiter. The circuit is based on a fixed gain and thus the

lnput Level Control provides attenuation only. The input of the unit can deal with Gain Levelled

lnput Signals between -10 and +10d8 but OdB (.775v) is preferable.

2 Operating Window Indicator.

This Bi-Colour LED indicates signal level to the unit's limiter circuitry.

Green indicates the threshold of the limiter and is factory preset for 250mV (-10dB). Any

applied signal should be illuminating this LED with the lnput Level control in the appropriate

position.

Red indicates that the signal is 10dB or more into compression. This led should not be

illuminated all the time but should flash with programme peaks. ldeal signal level will cause a

continuous toggle between the LED illuminating green and red.

3 Output Voltage Clip Indicator.

This LED is provided and will illuminate amber when the output voltage of the amplifier is

driven into clipping. ldeally this LED should never illuminate and implies that the output level is

too high, that the loop has gone open circuit and/or the loop impedance is too high.

4 Output Drive Control.

The "Output Drive" level control dictates current drive to the loop. lts position will be dictated by

the peak current level required to properly drive the loop as indicated by the chart on page 8.

/tu Australlan Monitor

KLa Loop Amplifier.s 3

5 Current Level Indicator.

The "Cunent Level" LED is provided as indication to show the peak cunent in the loop.

KLa I - Green = 3Amps, Red =6Amps.

KLa2 - Green = 5 Amps, Red = 10 Amps

see chart for loop calculations.

6 Fault / Current Limit Indicator.

This amber coloured LED will illuminate when load cunent exceeds a safe value. The led

indicates limiting of the cunent into the load and will flash with programme peaks. The

infrequent flashing of this LED on peaks at lower frequencies is quite acceptable. Constant

illuminating of this LED requires the output drive to be reduced.

The LED will also illuminate with other faults such as blown negative rail fuse and short circuits

on the output.

7 On lThermal Indicator

This is a Bi-Colour LED which will normally illuminate green and indicates that the amplifier is

on and receiving mains power.

ln the advent of a Thermal Overload this LED will tum red indicating that the intemal operating

temperature of the amplifier has exceeded a safe level of operation and that the amplifier has

shut down and isolated itself from the loop. The fan will continue to run and once the amplifier

has had a cool down period the unit will restart automatically providing inrush current

suppression, input muting and the loop relay isolation will be bypassed.

8 Power Switch

Press the switch down for ON and up for OFF. Like any other power amplifier in any system it

should be the last piece of equipment you tum on and the first piece of equipment you tum

ofr.

At tum-on a number of events happen during the power-up of the amplifier.

a) Mains inrush cunent suppression is provided,

b) A relay isolates the lnduction Loop until the amplifier has established itself,

c) lnput signal to the main amplifier is muted (>30d8) for approx'2 to 3 seconds.

/tu Aushalian lYonitor

KLa Loop Amplifters 4

Rear Panel

I Balanced Input & Strapping Connection

A female 3-pin XLR connector is provided as input connection. A male XLR connector is

provided as a strapping connector wired in parallel with the input XLR allowing

strapping/looping between multiple amplifiers.

Pin allocation is: Pin-l = Signal Ground, Pin-2 = Cold (reverse phase), Pin-3 = Hot (in phase).

2 Signal Ground Lift Switch

When this switch is engaged it disconnects signal ground from the amplifier. lt is intended to

be used when "HUM" is caused by earth loops or stray magnetic fields.

The amplifier should be tumed off before engaging this switch.

Loop Outputs.

Your Kla Loop Amplifier is provided with 2 options for output termination of the loop. Heavy

cunent Binding Post outputs are provided as well as a Neutrik "Speakon" connector.

The Speakon connector is wired 1+ = positive & 1- = negative.

Mains Lead

Your amplifier is supplied with a heavy duty mains lead (power cord) appropriately rated for the

mains supply voltage marked on the rear panel of your amplifier. The wires in the mains lead

are coloured in accordance with the following code.

Brown = Active, Blue = Neutral, Green/yellow = Earth.

Your unit must always be earthed!

Mains Circuit Breaker

A "push to reset" thermal circuit breaker is supplied to provide overall protection of

amplifiers power supply. lt will isolate the "active" mains conductor in the event of a

current internal fault or in continued overload conditions,

D.C. Rail Fuses

3AG "fast bloy/' type fuses are provided and are in series with the positive and negative supply

rails for your amplifiers output stage. These fuses provide overall protection of the output

stage.

The fuses must be replaced with the same type fuse.

KLal = 8 Amps, l(La2 ='10 Amps.

your

high

,//Ll< r-;a*

l"^ffi.*.74rz

I\lll sm.G.xmd \ ro7'e!.o/.oh,/

/tu Aushalian Monitor

KLa Lpop Amplifiers 5

To set up your KLa Loop Amplifier:

Once all connections have been made:

I Make sure all the controls are down before you tum the amplifier ON.

2 npply signal (applied signal should be gain levelled and be around odB - 0.775 volts )

3 Turn up'INPUT LEVEL'knob until 'OPERATING WINDOW" LED is flashing between green

and red illuminations.

NOTE: The red LED should not be on constantly, but should flash with programme peaks.

4 Tum up 'OUTPUT DRIVE" control to the desired cunent level.

KLa 1 Green = 3Amps, Red = 6 Amps.

KLa2 Green = 5 Amps, Red = 10 Amps.

NOTE: These LEDS are to illuminate on peaks only.

5 Use a field strength meter or loop listening device to monitor level and coverage in the loop.

The do's and don'ts

There are a few precautions you need to consider when installing your lnduction Loop System.

As there is a strong field radiating from the cable it can interfere with other electronic equipment

thus your loop should be restricted (as far as possible) to a defined listening area.

Do:

Always ensure the installation of your Loop is in accordance with wiring regulations.

As far as possible have your loop at the same elevation as the listening position, 1 to 2 metres

above or below this is acceptable but more cunent drive may be required.

Run balanced signals / cables wherever possible.

Do Not:

Do not install the loop with other cable runs - never run the loop cable in parallel with other cables

- and always cross other cables at right angles.

Do not run your Loop cable in conduit or in / or near shielded trays as this may effect its

performance.

Do not have dynamic type microphones, which may be a part of the signal source, inside or near

- the loop. The coil may pick up the radiated field from the loop and cause feedback to occur in

the system.

' Do not run unbalanced signals / cables as they may be affected by the Loop and cause

feedback.

/tu Ausbdan Monitor

KLa Loop Amplifiers 6

Why An Induction Loop system.

Usually, an lnduction Loop system is installed as an aid to provide audio for the hearing impaired.

The system is driven by an amplifier which can provide a constant cunent into a wire loop

encompassing the listening area. A field is radiated from the cunent flowing in the loop, and this

radiated field induces cunent to flow (more often than not) in a "T-Coil" in the hearing aid device

of the hearing impaired.

Because a length of wire is used as the load from which the signal is radiated, it makes special

demands on the amplifier driving it.

The wire will exhibit a very low impedance at low frequencies and exhibit a higher impedance as

the frequency rises. To maintain a constant radiation from the piece of wire (through the audio

bandwidth) you must maintain a constant cunent into the load. Normally encountered amplifiers

are a constant voltage type and will not drive an lnduction Loop System properly as their voltage

output is constant (regardless of load variations) and fidelity will be lost in the system as radiation

will reduce as the frequency rises.

The graphs below show the transfer characteristic of a Klal into 50 metres of 2.00 mm2 cable.

This Loop exhibits an impedance of 0.5 ohm at 200H2 and an impedance of 4 ohms at lokHz.

Power into the loop @ 2O0Hz = 12.5 VA but @ 10kHz the power = 1O0 VA. A constant voltage

type amplifier diving the same loop at 5 amps @ 200H2 would be down 1$dB @ 10kHz.

Also the amplifier is driving a virtual short circuit for the lower frequency spectrum and thus would

invoke protection circuitry to continuously operate in constant voltage type amplifiers.

Two traces are shown above. The KLa Loop Amplifiers have an internal adjustment (RV-1)

which allows for the higher frequency response to be extended. The upper trace on the graphs

show a fully- compensated high frequency response. This adjustment would normally be left at the

factory pres'et (no compensation), but could become useful in circumstances where the loop was

not properly calculated.

The hearing impaired can detect more detail in the programme if dynamic range is reduced. For

this reason lnduction Loop Systems should be fed with gain levelled signal. The KLa amplifiers

have a built in limiter to further reduce transients in the applied programme source.

iii '-i

\ \i

\i\

.,* ' '"']

*r0

0t( __ll t* l0 lo t(

OutDut Voltase Vs Freouencv Current OutDut Vs Freouencv

The above graph (lowest trace) shows the output

voltage variation of e KLal required to maintein e

constant current of 5 amDs into the lnduction LooD.

The above graph (lowest trace) shows the

Frequency Response relative to cunent output of the

KLal. odB reference = 5amps @ 200H2.

/tu Ausbalian Monitor

KLa Loop Amplifiers 7

Calculating the Induction Loop.

The following information is provided as a guide for the proper calculation of your lnductive Loop

installation. You will need to know the size of your loop to ascertain the peak drive cunent

reguired and to select the appropriate gauge of the wire for the loop.

LOOP

H|GH cuRRENr TERMTNA-floN ",o"" I

')c-

OUTPUT TFRMINAI S : LENGT H

LOOP FEED

PARALLELING LINKS

IIF REOUIRED}

.- BREADIH -.....*

First we need to calculate the Peak cunent required in the loop. The lnduction Loop Peak Cunent

Chart (page 8) shows the relative cunent required for different size loops - Pick the closest

cunent (Ampere) curve. lf your loop is a circle, simply approximate it to a square.

Then we need to determine the length of cable required (length + breadth) x 2. this will give us

the perimeter of the loop. To this add the loop feed distance, for a total wire length.

Now we need to calculate the gauge of the wire. lt is recommended that the total D.C. resistance

of the loop is between 0.5ohm and 1.0 ohm. We also recommend that you ensure the cunent

rating of the cable is well above the peak cunent required into the loop (>2 times) and that the

insulation is of a heavy duty type with a good dielectric strength and high thermal capacity.

To help reduce the variation in wire gauges needed to satisfy every loop we suggest running a

heavy duty figure-8 cable with a termination block (as shown in the above diagram) which will

allow you to parallel the conductors if the resistance of the loop is too high.

Stranded copper conductors to 836360 - 1991

For example: A loop that is 15 metres by 40 metres requires a peak cunent of 8 amps. lts

perimeter = 110 metres and the loop feed is 10 metres long, thus 120 metres of cable is required.

To achieve a D.C. resistance of between 0.5 and 1.0 ohms we would need to use 12 AWG wire

which will give us 0.72 ohms total D.C. resistance and a cunent rating 2.5 times the peak cunent

required (20 amps). Paralleling 16 AWG wire would give us a similar result @ 0.756 ohms for 18

amps.

1.00

1.50

2.OO

2.50

-3.00

32tO.20

30/0.25

40t.o25

50/.025

63tO.25

1.85

1.26

0.98

0.76

0.60

ltu Aushalian Monitor

€

-c

th ,4

-c (5 ..i

I oci

E tD Fl

F =v

- uo

-E' 3U

o E'=

: ou

o !s

o hs

h oh

- *tD

= ECL

E fi€

& bP

cL lo

5 pE

: :s)

J(JE

s *q

E EI

c -O

o(I'o

bat p ru

3 bE -E

E s\ g+

a eE oQ

- oct

E aA gE

q .ES s=

.n v_ CD -c

3 cb 5E,

-9 85 ;_U

- o.=

b 9o

fr tE

! EO

E oE

:- (It (Y

= > r,.j

o e>

-c .ct

o E-c

- o=

E gH

b .co

= o.E

t 9o

E tE

E EE

o oE

E -o

(i 31

.y. o*

E <.E

(L id<

9E E

'? Ul

-c

16l

-cl

trl

0rl

ol 6r

-Yl

0rl

o-l

ol E^

!l F=

cl S'

€l E'

=l :t\

El d

El .z@

oro

(! t

a.l Fr

dccr

'lE'l

t(5v

o(Jo

I .r< tt>

J(5

r0)

lfll

url

S=9ocoNo.otorNre

t N o (. o !t a{ o 6 € !t d o ao lo t N

oooNr{(\r.i6t

Inhaltsverzeichnis

Andere AUSTRALIAN MONITOR Verstärker Handbücher

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR KA1200 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AMIS26 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR SY400V SY800V Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR Digipage JR Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR ACM604P Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR ERA Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR HS250P Kurzanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR HS60 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR PA1500 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AMIS26 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR SY2200 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AMIS AMC60 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR ACM120 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AMC+ SERIES Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR PICOBLU Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AM2200 Tri-Amp Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR KA1500 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AMIS480P Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AMD2100P Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AMIS604 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AMIS60 Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR DCM500 - Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR AM2200NG Bedienungsanleitung

AUSTRALIAN MONITOR

AUSTRALIAN MONITOR CX100 Bedienungsanleitung

Beliebte Verstärker Handbücher anderer Marken

ASTRO

ASTRO HVO V40 P Bedienungsanleitung

Marantz

Marantz SUPERSCOPE BLA-545 Montageanleitung

NAD

NAD CI980 Bedienungsanleitung

Technics

Technics SE-CH770 Bedienungsanleitung

Harman Kardon

Harman Kardon HK6300 Bedienungsanleitung

NAD

NAD T975 Bedienungsanleitung

McIntosh

McIntosh MA6850 Bedienungsanleitung

Electro-Harmonix

Electro-Harmonix ENGLISH MUFF’N Bedienungsanleitung

Viatron

Viatron Autrix Bedienungsanleitung

GME

GME GA9800 Bedienungsanleitung

Atlas

Atlas CP700 Bedienungsanleitung

Roland

Roland KC-1000 Bedienungsanleitung

Pyle

Pyle PFMRA350BW Bedienungsanleitung

Advantage

Advantage S-250 Bedienungsanleitung

IRT Electronics

IRT Electronics DVA-3007 Bedienungsanleitung

Dimavery

Dimavery BA-100 Series Bedienungsanleitung

Sony

Sony XM-S400D Bedienungsanleitung

Schertler

Schertler ROY X Bedienungsanleitung