Audison LRx 6.SR Direct User Manual

CAR POWER AMPLIFIER

22

INTRODUCTION

INTRODUCTION
Audison thanks you for preferring this product and compliments you on your choice since it was

designed in order to insure outstanding musical and instrumental performances.
Before use instructions, please carefully read the safety norms you have to respect in order to avoid
unpleasant inconveniences and to enjoy this product at best.

Safety precautions

•

The vehicle electric system

must have 12VDC voltage with negative to ground. Make sure your car has it

in order to avoid any damages to your amplifier and to the car itself.

•

Suitably fix the amplifier

with the screws given with it; pay utmost attention if you install it into the
driver’s compartment. Use extra fixing systems if you install it inside the bonnet. If the amplifier
detaches itself while you are driving,it can severely damage people and other vehicles.

•

Power supply cable

must have mechanically resistant and self-extinguishing insulation.Its section has to
comply with what is indicated in this manual.When placing it, avoid to press it against cutting parts or
close to mechanical moving objects. Make sure it is suitably fixed all along its length. Put a clamping
screw between positive and negative cable just close to the amplifier power supply terminal block.

•

Put a fuse holder

close to the battery positive terminal;connect one end of the power supply cable to it
after connecting its other end to the amplifier.The fuse value mustbe the same as the amplifier built-in
one. In case the cable supplies several amplifiers, the fuse value will have to beequal to the sum of the
values of all other fuses in the system.

•

For safer driving,

we recommend to adjust volume not to drown external traffic sounds.

•

WARN ING.

When the amplifier works in particularly hard conditions,it can reach 90°C (194°F).Make sure

its temperature is safe before touching it.

Functioning precautions

•I

nstall the amplifier

in locations where temperature is between 0°C (32°F) and 55°C (131°F).

•

Don’t connect –L and –R power outputs one to the other.

If you use an external stereo crossover, make sure

that its negative poles are not connected one to the other.

•

When installing speakers

and the cables that connect them, make sure that non-insulated parts don’t

touch the car chassis.If they do, the amplifier protection intervenes.

•

Listening level calibration

is made by adjusting the source volume up to 3/4 of its maximum level; then,

adjust the amplifier levels until you can hear distortions.

Maintenance precautions

•

Periodically clean the amplifier

avoiding to use aggressive solvents that might damage plastic or painted
parts. Dampen a piece of cloth with water and soap, wring it and clean the amplifier with it. Then,
clean the amplifier by using a piece of cloth dampened with water only; eventually clean it with a dry
piece of cloth.

23

CONTENTS

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 24

In-Out panel

Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Power supply panel

Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Fuse replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Controls panel

Functions and controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Setting panel

Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Subsonic filter activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Subsonic filter cut-off frequency modification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

VCA-VCA1D modules insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Technical features

Size for fixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

LRx 6.SR Direct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Accessories

VCRAK and VCRDK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

CLK2 - LRx Cooling Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Configurations

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Controls panel diagram and subsonic filter switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Configuration example

Front+Rear+Center+Sub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Installation

Logo rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Amplifier fixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Electric connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

audison cable products for electric connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

audison measurement standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

24

DESCRIPTION

Audison LRx 6.SR Direct:

Six channel car power amplifier characterised by excellent musical performances, small size and
outstanding energy reserve.
Its PWM power supply stage is made with two pairs of 70A MOSFETs; it is stabilised and oversize.
Input stage is provided with a special circuit (LNS) which allows the system disturbances rejection,
reducing noise that is usually due to the vehicle electric parts (alternator, electronic injection, etc.),
without altering musical signal quality.
Driver stage is characterised by a very linear circuitry; it has coupled differential transistors and an A Class
complementary voltage amplifier. Power section has Darlington configuration with high gain and SOA
(Safety Operation Area) BJT TO247.Thanks to its great capacity to supply current, this amplifier can easily
drive even the hardest loads and satisfy whatever power needs.It can give 55W on Front, Rear and Center
channels and 150W on sub with 4 Ohm load, 80W on Front, Rear and Center channels and 220W on sub
at 2 Ohms in continuous mode. Differently from what occurs with other amplifiers, LRx 6.SR Direct is not
blocked by protection systems immediately below these load values. Its exclusive “Overload Limiter”
circuit allows it to go on working,limiting output power and pointing out how hard the applied load is by
the “Limit” LED blinking.
Its big power reserve, its constant control at low frequencies and its exquisite timbre qualities make it an
ideal amplifier to realise systems designed to attain outstanding musical features and very high sound
pressures (SPL).
LRx 6.SR Direct has a bypass subsonic filter (24dB/Oct.) with adjustable frequency, pre-set at 20Hz.

In case LRx amplifiers are used in extremely difficult conditions (very low loads) or in installations where
space is too narrow and their heat sink cooling is not enough,they can be employed together with CLK2
cooling system (optional).It is a system made of two units to apply onto the amplifier sides;each of them
is provided with an electronically controlled fan that allows the amplifier thermal stabilisation (see “CLK2
– LRx Cooling Kit”).

Protection includes:

• RGP (Resettable Ground Protection) circuit; in case a short circuit occurs between loudspeakers outputs
and car chassis, it detects a high current flow in the pre-input ground and acts by putting the amplifier in
stand-by, protecting its circuitry;

• a device against short circuits and against DC in the outputs, to protect loudspeakers;

• a device that detects the amplifier temperature excessive increase and stops its functioning until
optimal conditions occur again.

Once the causes which implied protection circuits intervention have been checked and solved, the
amplifier is reset by switching it off and on again.
The amplifier is also provided with another general protection which is insured by an internal strip fuse,
very easy to reach.

Optional:

The following devices are available upon request:
1- Two kits for subwoofer volume remote control:

• VCRAK (analogue and specific for subwoofer);

• VCRDK (digital;it can be used for master volume control or for level control of any ways in a multichannel
system).
2 - CLK2 cooling system.

25

IN-OUT PANEL

FUNCTIONS

26

POWER SUPPLY PANEL

FUNCTIONS

27

POWER SUPPLY PANEL

1 - Open the transparent cover by pushing the two teeth in its

lowest corners to the direction indicated by the arrows.

4 - Close the transparent cover.

3 - Check the value of the new fuse to assemble, then fix it by

gradually and alternately fastening the two screws. This will
avoid voltage drops along the line and will make the device
perfect functioning easier.

2 - Remove the screws which fasten the fuse to eliminate
pieces of the broken one; prevent them from going into the
device.

FUSE REPLACEMENT

28

CONTROLS PANEL

FUNCTIONS AND CONTROLS

29

CONTROLS PANEL

SETTING PANEL

30

It permits to reach the resistors to set subsonic filter cut-off frequency, the switch which activates
subsonic filter (SUBSONIC) and to insert VCA modules for the subwoofer volume remote control.

SUBSONIC FILTER ACTIVATION

Subsonic filter is activated through SUBSONIC switch under the setting panel.

• SUBSONIC switch permits to eliminate subsonic frequencies;
these sounds cannot be heard by human ears but cause useless
and damaging stress to amplifier and speakers. When it is on ON,
frequencies below the chosen cut-off one are eliminated.
Subsonic filter cut-off frequency can be adjusted through 4 Hz
steps; this occurs by replacing the special resistors located into a
socket which can be reached through the setting panel in the
amplifier bottom. The amplifier is given with 20 Hz cut-off
frequency.

2 - Once operations have
been carried out, please
close the setting panel.

1 - Remove the setting panel in the
amplifier bottom in order to carry out
operations.

FUNCTIONS

Setting panel

31

SETTING PANEL

SUBSONIC FILTER CUT-OFF FREQUENCY MODIFICATION

Replace FS1, FS2, FS3, FS4 resistors according to
the values in the setting panel table.

Remark: Cut the new resistors
rheophores according to the
size in the picture.

Procedure:

VCA-VCA1D MODULES INSERTION

LRx 6.SR Direct can accept one of the two optional kits which allow the subwoofer volume remote
control: VCRAK or VCRDK.
These kits have a specific module,VCA or VCA1D,to insert into the amplifier through the setting panel.

Installation:

1 - Remove BYP12 bridge.

2 - Insert VCA/VCA1D module.

- Insertion key. It prevents the module from
being inserted in the wrong way.

Subsonic filter is pre-adjusted at 20 Hz. In order to modify this value, please act according to what
follows.

TECHNICAL FEATURES

32

119 mm

412 mm

176 mm

445 mm

Drilling dimensions for fixing

*

SIZE FOR FIXING

LRx 6.SR Direct

POWER SUPPLY

Voltage: . . . . . . . . . . . . . . . . . . . . . . . . . 11 ÷ 15 VDC

Idling current: . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 A

Idling current when off: . . . . . . . . . . . . . . 0.02 mA

Consumption @ 13.8 VDC
(Max Musical Power):

- A config. (see Output Power): . . . . . . . . . 34.5 A

- B config. (see Output Power): . . . . . . . . . . . 51 A

- C config. (see Output Power): . . . . . . . . . 60.5 A

AMPLIFIER STAGE

Distortion – THD (1kHz): . . . . . . . . . . . . . . 0.009 %

Bandwidth (-3dB): . . . . . . . . . . . . . . 4 Hz ÷ 85 kHz

S/N ratio(A weighed @ 1V): . . . . . . . . . . . . 105 dB

Damping factor (1 kHz, 4 Ohms):. . . . . . . . . . . 240

Input sensitivity: . . . . . . . . . . . . . . . . 0.2 ÷ 5 VRMS

Input impedance: . . . . . . . . . . . . . . . . . 15 kOhms

Load impedance:

- Front/Rear/Center/Sub: . . . . . . . . . . 4 - 2 Ohms

Nominal output power (RMS)

NP @ 12VDC; THD 0.3%: . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . 55W x 5 (4 Ohms) + 150W x 1 (4 Ohms)

Output power (RMS) @ 13.8 VDC;THD 1%

- A config.: 55W x 5 (4 Ohms) + 150W x 1 (4 Ohms)

- B config.: 80W x 5 (2 Ohms) + 150W x 1 (4 Ohms)

- C config.: 80W x 5 (2 Ohms) + 220W x 1 (2 Ohms)

FILTERS/INPUTS

Subsonic: Bypass/ 24dB/Oct. Hi-Pass, 16÷32 Hz

(pre-set at 20 Hz)

Inputs: . . IN Front - IN Rear - IN Center - IN Sub

OTHER FUNCTIONS

Remote IN: . . . . . . . . . . . . . . . . 7 ÷ 15 VDC – 1 mA

Remote OUT (3 Outs): . . . . . . . . 12 VDC – 10 mA

Auxiliary power supply (PPS): ±12 VDC – 300 mA
IN VCR (SUB volume) VCA/VCA1D attenuation:

100 dB

Fuse: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 A

MAX SIZE (L x H x D): . . . . . . 176 x 56 x 445 mm

WEIGHT: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9 kg

33

ACCESSORIES

LRx 6.SR Direct can accept one of the optional kits that allow the subwoofer volume remote control.
VCRAK is analogic and special for sub; VCRDK is digital and can be used for master volume control or for
level control of any ways in a multichannel system.
These kits are available as accessories and consist of three elements:

1) Volume adjuster (VCRA/VCRD);

2) VCA/VCA1D module to put inside the amplifiers;

3) Wire to connect VCRA/VCRD adjusters to the proper sockets in the amplifier rear panel and to the car
lights switch, in order to light it up.
Install VCRA/VCRD adjusters in a place you can easily and comfortably reach, according to the following
connection diagram.

VCRAK and VCRDK

ACCESSORIES

34

This cooling system is specially designed to provide LRx amplifiers with the right working temperature.
CLK2 should be used when LRx amplifiers work in extremely hard conditions (very low loads) or in
installations where space is too narrow and heat sink cooling is not enough. It consists of two units to
apply onto the amplifier sides; each of them is provided with an electronically controlled fan. Its
intervention depends on a thermal sensor that starts the system as soon as LRx heat sink reaches 45°C.
The same sensor is connected to a special circuit which controls the two fans speed progressive
increase when temperature increases, too.
Air flux constant control allows the amplifier very good thermal stabilization and limits noise.

CLK2 – LRx Cooling Kit

35

CONFIGURATIONS

BLOCK DIAGRAM

36

CONFIGURATIONS

CONTROLS PANEL DIAGRAM AND SUBSONIC FILTER SWITCH

FRONT+REAR+CENTER+SUB

CONFIGURATION EXAMPLE

37

INSTALLATION

LOGO ROTATION

1 - Remove the transparent

cover which protects
controls and then the 4
screws which block the
metal plate by using
multispanner.

2 - Remove the plate without damaging the
silkscreen printed panel which will have to
stay on. We suggest that you seize both plate
grips with your hands and pull them by
blocking the silkscreen printed panel with
your fingers against the amplifier chassis at
the same time.This will permit to remove the
plate from the panel without damages.

3 - Remove the strip with
audison logo.

5 - Mount the plate

back by fixing it
through the screws;
then, re-assemble the
transparent cover
which protects
controls.

4 - Put the strip back again after turning it, so
that audison logo is upside down.

38

INSTALLATION

CAUTION
For the system safer protection, we
recommend the use of a strip fuse on
the cable that connects the battery
positive pole to the amplifier POWER
(+) terminal block.This fuse has to be
installed about 10 cm far from the
battery; its value will have to be
equal or slightly higher (+10%
approx.) than consumption @13.8
VDC, according to the different
configurations (see “Technical
features”).
It will have to be equal to the sum of
the values of all fuses in case system
consists of several amplifiers or in
case amplifiers have several fuses.

AMPLIFIER FIXING

COLLEGAMENTI ELETTRICI

LRx 6.SR Direct FUSE: 60A

39

INSTALLATION

audison cable PRODUCTS FOR ELECTRIC CONNECTIONS

PRINTED IN ITALY - Code 10125792

Standard di misura Audison

(Potenze misurate secondo lo standard audison edizione 1998)

- 12VDC e 13.8VDC;

- 1 kHz o frequenza di taglio del crossover;

- 0.3% THD @ potenza nominale; 1% THD @ potenza continua;

- Tolleranza: +10%, - 5%;

- Potenza continua misurata applicando una tensione RMS su carico resistivo;

- Potenza nominale misurata utilizzando una batteria da 12V DC con un carico di 4 Ohm e tutti
i canali in funzione.

Audison measurement standards

(Power measures taken according to audison standard, 1998 edition)

- 12VDC and 13.8VDC;

- 1 kHz or crossover cut-off frequency;

- 0.3% THD @ nominal power; 1% THD @ continuous power;

- Tolerance: +10%; -5%;

- Continous power given by RMS Voltage measured on resistive load;

- The nominal power of the amplifier is measured upon a battery voltage of 12 Volts with
a 4 Ohm load and with all channels in function.

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