LRx 2.500 - Receiver AUDISON - Free user manual and instructions

Product Type	Car Stereo Power Amplifier
Model	Audison LRx 2.500
Power Supply Voltage	11-15 VDC
Idling Current	1.1 A
Consumption @ 13.8 VDC (Max Musical Power)	23.5 A (4 Ohms) / 44 A (2 Ohms)
Nominal Output Power (RMS) @ 12 VDC, THD 0.3%	160W x 2 (4 Ohms)
Output Power (RMS) @ 13.8 VDC, THD 1% - 2 Ch Stereo	200W x 2 (4 Ohms) / 330W x 2 (2 Ohms)
Output Power (RMS) @ 13.8 VDC, THD 1% - 1 Ch Mono Bridge	660W x 1 (4 Ohms)
Distortion (THD @ 1 kHz)	0.009%
Bandwidth (-3dB)	4 Hz - 85 kHz
Signal-to-Noise Ratio (A-weighted @ 1V)	105 dB
Damping Factor (1 kHz, 4 Ohms)	240
Input Sensitivity	0.2 - 5 VRMS
Input Impedance	15 kOhms
Load Impedance	4-2 Ohms (stereo), 4 Ohms (mono bridge)
Filters	Hi-Pass/Lo-Pass 12dB/Oct, non-independent frequencies; Bypass option; Frequency range: 40-500 Hz (x1) / 400-5000 Hz (x10)
Protections	RGP, short circuit, DC output, thermal, overload limiter, internal fuse
Fuse Rating	50 A (internal strip fuse)
Remote IN Voltage	7-15 VDC (1 mA)
Remote OUT Capability	12 VDC (10 mA)
PPS (Phantom Power Supply)	±12 VDC, 300 mA
Dimensions (L x H x D)	176 x 56 x 370 mm
Weight	3.7 kg
Optional Accessory	CLK2 Cooling Kit (two fans with thermal control)

Frequently Asked Questions - LRx 2.500 AUDISON

What is the recommended power supply cable size for LRx 2.500?

For lengths of 4-5 meters, use 9 A.W.G. for 4 Ohm load and 6 A.W.G. for 2 Ohm load (or 4 Ohm mono). Always use strip fuse near battery.

How do I configure the amplifier for bridged mono mode?

Connect speaker to +L and -R outputs, set MODE switch to Mono, and ensure input is connected to right (R) channel only. The amp will deliver up to 660W RMS at 4 Ohms.

What does the orange LIMIT LED indicate?

It indicates the Overload Limiter circuit is active. This protects the amplifier from very low impedance loads. The amp continues functioning with reduced power. If LED flashes frequently, check for a load below 2 Ohms.

How can I rotate the Audison logo?

Remove the transparent cover and metal plate, take out the logo strip, turn it 180 degrees, and reassemble. This allows flexible mounting orientation.

What should I do if the red SAFETY LED stays on?

Switch the system off and on after at least 10 seconds. If LED remains on, check all connections. If problem persists, contact an authorized Audison service center.

Can I use LRx 2.500 with 1 Ohm speakers?

No, the minimum load impedance is 2 Ohms in stereo and 4 Ohms in bridged mono. Using lower loads may trigger the Overload Limiter or cause thermal protection.

How do I replace the main fuse?

Open the transparent cover on the power supply panel, remove the screws holding the fuse, replace with a 50A strip fuse of the same type, and tighten screws evenly. Always disconnect battery before servicing.

What is the purpose of the Remote IN and Remote OUT terminals?

Remote IN receives a turn-on signal (7-15V) from the head unit. Remote OUT passes this signal to another amplifier or device, allowing simultaneous power-on.

How do I set the crossover frequency?

Use the F1 control to adjust the crossover point between 40-500 Hz (x1 range) or 400-5000 Hz (x10 range). The HI-PASS and LO-PASS switches activate or bypass each filter. The AMP: HI/LO-PASS switch selects which filter applies to the speaker output.

Why is the amplifier turning off intermittently?

Possible causes: thermal protection (heat sink too hot), overload (very low impedance), or short circuit (outputs to chassis). Ensure proper ventilation, check speaker impedance, and inspect wiring. The protection resets after switching off and on again (wait 10 seconds).

USER MANUAL LRx 2.500 AUDISON

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%;
• Continuous 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.

audison

OWNER'S MANUAL

CAR POWER AMPLIFIERS

PRINTED IN ITALY - Code 10125760

Technical illustration of a dual-chamber electronic device labeled 'sulcon' and 'Aubison', showing internal components and mounting points (no text beyond labels)

audison

is a division of elettromedia

62018 Potenza Picena (MC) Italy

Tel. [phone] • Fax [phone] • http://www.audison.com • e-mail: [e-mail]

INTRODUCTION

INSTALLATION

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.

PRECAUTIONS

- Avoid to install the amplifier where temperature is below 0°C or above 55°C and in non ventilated places.

- The amplifier needs 12VDC power supply voltage with negative to ground. Be sure that your car electric system is compatible with the amplifier ordinary functioning.

- For safer driving, we recommend to adjust volume not to drown external traffic sounds.

WARNING!:

While installing the amplifier, make sure that the cable coming from the battery positive pole (+) doesn't touch the amplifier heat sink.

The heat sink is directly connected to the battery negative pole (-) through the screws which fix it to the vehicle chassis. Its contact with the positive pole cable would cause short circuit and, thus, possible fires and battery damages.

Please connect power supply cables to the amplifier terminal blocks (POWER + and -) before and to battery AFTER, to get maximum safety.

CAUTIONS

INPUTS: If the source output signal ground (PRE OUT) is not connected to the source chassis and the system sound is not powerful enough or is distorted, try to solve the problem by connecting the output signal cable braided shield (PRE OUT) to a point of the source chassis.

OUTPUTS: Don't connect -L and -R power outputs to each other or to ground (car chassis). In case you use an external crossover, make sure that channels grounds are not connected one to the other.

audison cable PRODUCTS FOR ELECTRIC CONNECTIONS

audison cable

RING TERMINALS

RECOMMENDED POWER SUPPLY CABLES

Cable must be chosen according to its length and to the system total power.

MODEL	POWER SUPPLY TERMINAL BLOCKS		CABLES		BATTERY + AND GROUND
	4 Ohms	MAINCRIMP 10	For 12 A.W.G.	MAINPOWER 10(red and black)	PR 52.17R A B	RB 6.34.1G f = 6 (.24)RB 8.34.1G f = 8 (.31)
	2 Ohms(4 Ohms mono)	MAINCRIMP 10	For 10 A.W.G.	POWERFLOW 9(red and black)	PR 52.17R A B	RB 6.34.1G f = 6 (.24)RB 8.34.1G f = 8 (.31)
	4 Ohms	MAINCRIMP 10	For 11 A.W.G.	MAINPOWER 10(red and black)	PR 52.17R A B	RB 6.34.1G f = 6 (.24)RB 8.34.1G f = 8 (.31)
	2 Ohms(4 Ohms mono)	MAINCRIMP 8	For 8 A.W.G.	MAINPOWER 8(red and black)	PR 62.19R A B	RB 6.45.1G f = 6 (.24)RB 8.45.1G f = 8 (.31)
	4 Ohms	MAINCRIMP 10	For 9 A.W.G.	POWERFLOW 9(red and black)	PR 52.17R A B	RB 6.34.1G f = 6 (.24)RB 8.34.1G f = 8 (.31)
	2 Ohms(4 Ohms mono)	MAINCRIMP 8	For 6 A.W.G.	MAINPOWER 5(red and black)	PR 80.24R A B	RB 6.58.1G f = 6 (.24)RB 8.58.1G f = 8 (.31)

RECOMMENDED SPEAKERS CABLES

SPEAKERS TERMINAL BLOCKS	CABLE
MAINCRIMP 14	096/20 MV	2 x 16 A.W.G.
MAINCRIMP 14	093/20	2 x 14 A.W.G.
MAINCRIMP 14	092/20	2 x 12 A.W.G.

INSTALLATION

AMPLIFIER FIXING

3D rendering of a rectangular electronic device with labeled ports and connectors (no readable text or symbols)

Fix the amplifier through the self-tapping screws (4.2 x 16) given with it.

ELECTRIC CONNECTIONS

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.

POWER SUPPLY CABLE SIZELength: 4/5 m
Load	4 Ohms		2 Ohms(4 Ohms mono)
Unit of measure	mm 3	A.W.G.	mm 3	A.W.G.
LRx 2.150	3	12	5.1	10
LRx 2.250	3.8	11	7.6	8
LRx 2.500	6.5	9	12	6

CONTENTS

Description p. 4

In-Out panel

Functions 5

Power supply panel

Functions 6

Fuse replacement 7

Controls panel

Functions and controls 8

Technical features

Size for fixing 10

LRx 2.150 10

LRx 2.250 11

LRx 2.500 11

Accessories

CLK2 - LRx Cooling Kit 12

Configurations

Block diagram 14

Configurations table 15

Controls panel diagram 15

Configuration examples

Mono (Front+Sub) 16

Front+Sub 17

Front+Sub (Trimode) 18

Front+Rear+Sub 19

Multichannel 20

Installation

Logo rotation 21

Amplifier fixing 22

Electric connections 22

audison cable products for electric connections 23

audison measurement standards 24

DESCRIPTION

Audison LRx 2.150, LRx 2.250 and LRx 2.500:

Car stereo power amplifiers characterised by excellent musical performances, small size and outstanding energy reserve.

Their power supply stage is made with 70A MOSFETs (one pair in LRx 2.150, two pairs in LRx 2.250 and three pairs in LRx 2.500); It is PWM, stabilised and oversize.

Input stage is provided with a special circuit (LNS) which permits 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 stages are characterised by a very linear circuitry. They have coupled differential transistors and an A Class complementary voltage amplifier. Power sections have Darlington configuration with high gain and SOA (Safety Operation Area) BJT TO247. Thanks to their great capacity to supply current, these amplifiers can easily drive even the most difficult loads and satisfy whatever power needs. They can give powers between 80 and 200W per channel with 4 Ohm load and between 110 and 330W per channel at 2 Ohms in continuous mode. Powers range increases in mono mode (bridged) and it is between 220 and 660W on 4 Ohms. Differently from what occurs with other amplifiers, LRx 2 are not blocked by protection systems immediately below 2 Ohms. Their exclusive "Overload Limiter" circuit allows them to go on working, limiting output power and pointing out how hard the applied load is by the "Limit" LED blinking.

Their big power reserve, their constant control at low frequencies and their exquisite timbre qualities make them ideal components to realise systems designed to attain outstanding musical features and very high sound pressures (SPL).

LRx 2 have two bypass HI-PASS and LO-PASS filters with non independent frequencies. Their configuration is Butterworth, 12dB/Oct.

A switch permits to decide whether to send the HI-PASS section or the LO-PASS one to power stages.

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").

LRx 2 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:

- CLK2 cooling system is available upon request.

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.

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

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

CONFIGURATION EXAMPLES

MULTICHANNEL

graph TD
    A["Pre Out"] --> B["Front"]
    A --> C["Rear"]
    B --> D["Subwoofer"]
    B --> E["Subwoofer"]
    C --> F["LRx 1.400 Config. 4"]
    C --> G["LRx 2 Config. 5"]
    C --> H["LRx 2 Config. 7"]
    C --> I["LRx 2 Config. 1/3"]
    C --> J["LRx 2 Config. 1/3"]
    D --> K["Woofer"]
    E --> L["Woofer"]
    F --> M["Midwoofer"]
    G --> N["Midwoofer"]
    H --> O["Midwoofer"]
    I --> P["CX"]
    J --> Q["CX"]
    K --> R["Midrange Tweeter"]
    L --> S["Midrange Tweeter"]
    M --> T["CX"]
    N --> U["CX"]
    O --> V["CX"]
    P --> W["CX"]
    Q --> X["CX"]
    R --> Y["Midrange Tweeter"]
    S --> Z["Midrange Tweeter"]
    T --> AA["CX"]
    U --> AB["CX"]
    V --> AC["CX"]
    W --> AD["CX"]
    X --> AE["CX"]

20

IN-OUT PANEL

FUNCTIONS

LEFT/RIGHT

Power outputs of the amplifier left and right channels. Connect the speakers cables to these outputs according to polarity. Terminal blocks accept cables up to 9 A.W.G. max (see "audison cable products for electronic connections" as far as their size is concerned). We recommend the use of audison cable products.

Please use +L and -R terminal blocks called mono in order to connect the amplifier in bridge and exploit the maximum power insured by this configuration.

PPS (Phantom Power Supply) Power supply socket for audison external audio accessories.

OUT

Left (L) and right (R) channels preamplified outputs (PRE OUT), to send to an additional amplifier. Please see "Configurations table" in order to check the type of signal.

IN

Amplifier left (L) and right (R) channels inputs (PRE IN). The preamplified outputs (PRE OUT) of a source (head unit, CD player, DAT, etc.) or of an external electronic crossover must be connected to them.

Connect only the right (R) channel input in order to use the amplifier in mono.

5

POWER SUPPLY PANEL

FUNCTIONS

REMOTE IN

Terminal to connect Remote cable, which comes from the source and which controls the amplifier switching on. Applied voltage must be between 7 and 15VDC.

REMOTE OUT

Terminals to repeat the switching on control (Remote IN) coming from the source. They are used to switch on another amplifier or device in the system simultaneously. Available voltage is the same as the one applied on Remote IN.

FUSE (LRx 2.150: 20A - LRx 2.250: 30A - LRx 2.500: 50A)

Strip fuse. It insures the amplifier general protection. In case the fuse breaks down, please replace it by respecting its original value.

CAUTION: If you want to protect the system even more, please put a strip fuse onto the cable which connects the battery positive pole to the amplifier POWER (+) terminal block (see "Electric connections").

POWER

Terminal blocks for the amplifier power supply cable connection. Connect positive and negative poles according to indicated polarities. Holes have 8mm diameter and accept cables up to 3 A.W.G. max. In order to get the best current transfer, please use power supply cables with as big a section as possible. audison cable catalogue offers you a complete range of such products which can satisfy whatever demands; you can also find Maincrimp terminals in it. We strongly recommend their use because they contain the cable non protected end and allow the terminal block to fasten all its useful section.

CONFIGURATION EXAMPLES

FRONT+REAR+SUB

graph TD
    A["Pre Out"] --> B["Front"]
    A --> C["Rear"]
    B --> D["LRx 2 Config. 3"]
    C --> E["LRx 2 Config. 5/7"]
    D --> F["CX"]
    D --> G["CX"]
    F --> H["Woofer"]
    G --> I["Woofer"]
    D --> J["Subwoofer"]
    D --> K["Subwoofer"]
    E --> L["Rear"]
    E --> M["Rear"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#ccf,stroke:#333
    style D fill:#cfc,stroke:#333
    style E fill:#cfc,stroke:#333
    style F fill:#fcc,stroke:#333
    style G fill:#fcc,stroke:#333
    style H fill:#cff,stroke:#333
    style I fill:#cff,stroke:#333
    style J fill:#ffc,stroke:#333
    style K fill:#ffc,stroke:#333

CONFIGURATION EXAMPLES

FRONT+SUB (TRIMODE)

FREQUENCY Hertz	SPEAKERS IMPEDANCE
	4 Ohms		8 Ohms
	L (mH)	C ( µF )	L (mH)	C ( µF )
60	10.6	660	21.0	330
80	7.9	495	15.9	245
100	6.4	400	12.7	200
120	5.3	330	10.6	165
150	4.3	265	8.5	132

CX PASSIVE CROSSOVER

18

POWER SUPPLY PANEL

FUSE REPLACEMENT

Illustration of a hand inserting a card into a stack of documents (no text or symbols visible)

1 - Open the transparent cover by pushing the two teeth in its lowest corners to the direction indicated by the arrows.

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

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.

4 - Close the transparent cover.

Illustration of a hand inserting a stack of documents into a folder (no text or symbols visible)

7

CONTROLS PANEL

FUNCTIONS AND CONTROLS

LIMIT (orange LED)

It indicates the Overload Limiter circuit is on.

Caution:

When this led is on (although sporadically), it means the applied load is a hard one. The activation of Overload Limiter circuit (output power limiter) will anyway allow the amplifier to function without distortions. In case Overload Limiter gets on too frequently (at every power peak), you will need to check if there are any failures or a too difficult load (that's to say impedance is about 50% lower than the minimum recommended one). The amplifier can go on functioning in these conditions but power will inevitably decrease.

AMP: HI/LO-PASS (Pre Out: Lo/Hi-Pass)

It permits to choose which type of signal (Lo-Pass or Hi-Pass) to send to the amplifier stage. The unselected signal will, thus, be on the PRE OUT output.

Amp: Hi-Pass → Preout: Lo-Pass

Amp: Lo-Pass → Pre Out: Hi-Pass.

(see "Configurations table").

8

CONFIGURATION EXAMPLES

FRONT+SUB

CX PASSIVE CROSSOVER

17

CONFIGURATION EXAMPLES

MONO (FRONT+SUB)

graph TD
    A["Pre Out"] -->|Sub| B["LRx 2 Config. 7 mono: Mode"]
    A -->|Front L| C["LRx 2 Config. 1/3 mono: Mode"]
    A -->|Front R| D["LRx 2 Config. 1/3 mono: Mode"]
    B --> E["Subwoofer"]
    C --> F["Front L"]
    D --> G["Front R"]
    H["Wooler Midrange Sweeter"] --> I["CX"]
    J["Wooler Midrange Sweeter"] --> K["CX"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#ccf,stroke:#333
    style D fill:#ccf,stroke:#333

CONTROLS PANEL

MODE

It permits to switch the amplifier functioning mode between Stereo and Mono (bridged).

LEVELS

It adjusts the input sensitivity of both amplifier channels and sets their output level.

F1

It permits to set Lo-Pass and Hi-Pass crossover point between 40 and 500 Hz.

RANGE: x1/x10

Frequencies range switch.

It permits to select the preset frequencies ranges within which to realise the crossover point between Lo-Pass and Hi-Pass through F1.

x1 → 40÷500Hz
x10 → 400Hz ÷ 5kHz

HI-PASS

It permits to activate (On) or bypass (Bypass) the HI-PASS filter. In this way, a HI-Pass signal or a full range one will be on the output, that is selected by AMP: HI/LO-PASS switch.

LO-PASS

It permits to activate (On) or bypass (Bypass) the LO-PASS filter. In this way, a Lo-Pass signal or a full range one will be on the output, that is selected by AMP: HI/LO-PASS switch.

SAFETY (red LED)

It indicates that the amplifier protection circuits are on. In order for the amplifier to work again, you need to switch the system off and then on after 10 seconds at least. We recommend to check all connections before switching the amplifier on again.

If LED stays on, please contact Audison authorised after sale centres.

TECHNICAL FEATURES

SIZE FOR FIXING

LRx 2.150

LRx 2.250

LRx 2.500

* Drilling dimensions for fixing

LRx 2.150

POWER SUPPLY

Voltage:	11÷15 VDC
Idling current:	0.5 A
Idling current when off:	0.02 mA

Consumption @ 13.8 VDC
(Max Musical Power):
- A config.(see Output Power):....11 A
- B/C config.(see Output Power):....18.5 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:	15kOhms

Load impedance:

- 2 Ch. stereo:....4-2 Ohms - 1 Ch. mono in bridge:....4 Ohms

Nominal output power (RMS)

NP @ 12VDC; THD 0.3%: ..... 70W x 2 (4 Ohms)

Output power (RMS) @ 13.8 VDC; THD 1%
-A config: 80W x 2 (4 Ohms)
- B config: 110W x 2 (2 Ohms)
- C config: 220W x 1 (4 Ohms)

FILTERS/INPUTS

IN L/R: Bypass/ 12dB/Oct. Hi-Pass/Lo-Pass.(40÷500 Hz/400÷5000 Hz)

Pre Out: Bypass/12dB/Oct. Hi-Pass/Lo-Pass.

(40÷500Hz/400÷5000Hz)

Inputs:

IN L-R

OTHER FUNCTIONS

Remote IN:	7÷15 VDC-1 mA
Remote OUT:	12 VDC-10 mA
Auxiliary power supply (PPS):	±12 VDC-300 mA
Fuse:	20 A

MAX SIZE (L x H x D):

176×56×260 mm

WEIGHT:

2.6kg

CONFIGURATIONS

CONFIGURATIONS TABLE

LRX 2 models can be configured as follows:

Config. 1 = Speaker L-R (HI 12 dB); Pre Out (Lo 12 dB)
Config. 2 = Speaker L-R (Full Range); Pre Out (Lo 12 dB)
Config. 3 = Speaker L-R (HI 12 dB); Pre Out (Full Range)
Config. 4 = Speaker L-R (Full Range); Pre Out (Full Range) Config. 5 = Speaker L-R (10-12 dB); Pre Out (HI 12 dB)
Config. 3 = Speaker L-R (Lo 12 db); Pre Out (Hi 12 db) Config. 6 = Speaker L-R (Full Range); Pre Out (Hi 12 d)
Config. 7 = Speaker L-R (Lo 12 dB); Pre Out (Full Range)

CONFIG.	SPEAKER L/R	PRE OUT	AMP/PRE OUT	HI-PASS	LO-PASS
1			HI/LO	ON	ON
2			HI/LO	BYPASS	ON
3			HI/LO	ON	BYPASS
4			HI/LO	BYPASS	BYPASS
5			LO/HI	ON	ON
6			LO/HI	ON	BYPASS
7			LO/HI	BYPASS	ON

CONTROLS PANEL DIAGRAM

CONFIGURATIONS

BLOCK DIAGRAM

graph TD
    A["INPUT L"] --> B["MONO"]
    B --> C["R"]
    C --> D["OUTPUT R"]
    D --> E["SUBMIT V-0.25"]
    E --> F["OUTR RECOU"]
    F --> G["F1 Fave"]
    G --> H["PREOUT L"]
    H --> I["R"]
    I --> J["OUTPUT R"]
    style A fill:#f9f,stroke:#333
    style J fill:#f9f,stroke:#333

14

NON INDEPENDENT FREQUENCY CONTROL INDIVIDENDENT FREQUENCY CONTROL HI-PASS LO PASS BAND PASS NON INVERTED AMPLIFIER INVERTED AMPLIFIER STEREO SIGNAL

TECHNICAL FEATURES

LRx 2.250

POWER SUPPLYVoltage:...... 11÷15 VDCIdling current:...... 0.7 AIdling current when off:...... 0.02 mAConsumption @ 13.8 VDC(Max Musical Power):- A config.(see Output Power):...... 13.8 A- B/C config.(see Output Power):...... 27.5 A	Nominal output power (RMS)NP @ 12VDC;THD 0.3%:...... 100W x 2 (4 Ohms)Output power (RMS) @ 13.8 VDC;THD 1%- A config.:...... 120W x 2 (4 Ohms)- B config.:...... 210W x 2 (2 Ohms)- C config.:...... 420W x 1 (4 Ohms)
	FILTERS/INPUTSIN L/R:Bypass/ 12dB/Oct.Hi-Pass/Lo-Pass(40÷500 Hz/400÷5000 Hz)Pre Out:Bypass/ 12dB/Oct.Hi-Pass/Lo-Pass(40÷500 Hz/400÷5000 Hz)Inputs:...... IN L-R
AMPLIFIER STAGEDistortion - THD (1kHz):...... 0.009 %Bandwidth (-3dB):...... 4 Hz÷85 kHzS/N ratio (A weighed @ 1V):...... 105 dBDamping factor (1 kHz, 4 Ohms):...... 240Input sensitivity:...... 0.2÷5 VRMSInput impedance:...... 15kOhmsLoad Impedance:- 2 Ch.stereo:...... 4 - 2 Ohms- 1 Ch.mono In bridge:...... 4 Ohms
	OTHER FUNCTIONSRemote IN:...... 7÷15 VDC - 1 mARemote OUT:...... 12 VDC - 10 mAAuxiliary power supply (PPS):±12 VDC - 300 mAFuse:...... 30 A
	MAX SIZE (L x H x D):176X56X300 mmWEIGHT:...... 3.0 kg

LRx 2.500

POWER SUPPLYVoltage:......11÷15 VDCIdling current:......1.1 AIdling current when off:......0.02 mAConsumption @ 13.8 VDC(Max Musical Power):- A config.(see Output Power):......23.5 A- B/C config.(see Output Power):......44 A	Nominal output power (RMS)NP @ 12VDC;THD 0.3%:......160W x 2 (4 Ohms)Output power (RMS) @ 13.8 VDC;THD 1%- A config.:......200W x 2 (4 Ohms)- B config.:......330W x 2 (2 Ohms)- C config.:......660W x 1 (4 Ohms)
	FILTERS/INPUTSIN L/R:Bypass/ 12dB/Oct.Hi-Pass/Lo-Pass(40÷500 Hz/400÷5000 Hz)Pre Out:Bypass/ 12dB/Oct.Hi-Pass/Lo-Pass(40÷500 Hz/400÷5000 Hz)Inputs:......IN L-R
AMPLIFIER STAGEDistortion - THD (1kHz):......0.009 %Bandwidth (-3dB):......4 Hz ÷ 85 kHzS/N ratio (A weighed @ 1V):......105 dBDamping factor (1 kHz, 4 Ohms):......240Input sensitivity:......0.2÷5 VRMSInput impedance:......15kOhmsLoad impedance:- 2 Ch.stereo:......4 - 2 Ohms- 1 Ch.mono in bridge:......4 Ohms
	OTHER FUNCTIONSRemote IN:......7÷15 VDC - 1 mAAutiliary power supply (PPS):±12 VDC - 300 mAFuse:......50 A
	MAX SIZE (L x H x D):176X56X370 mmWEIGHT:......3.7 kg

11

ACCESSORIES

CLK2 - LRx Cooling Kit

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.

Technical line drawing of a mechanical component with heat exchangers and cooling fins (no text or symbols)

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ACCESSORIES

Installation:

graph TD
    A["First fan"] -->|Remote| B["audison"]
    B -->|Remote OUT| C["Battery 12 V"]
    C -->|Ground| D["Second fan"]
    D -->|Remote IN| B
    B -->|Power| C
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333

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