Audison LRX 4.300 manual Description, Amplifier Fixing Electric Connections, LRx 4.300 Fuse 30A

DESCRIPTION

Audison LRx 4.300:

Four 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 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 its great capacity to supply current, this amplifier can easily drive even the hardest loads and satisfy whatever power needs. It can give 65W per channel on 4 Ohm load and 105W per channel at 2 Ohms in continuous mode. Power increases up to 210Wx2 at 4 Ohms in mono (bridged); it is 65Wx2 and 220Wx1 at 4 Ohms in three channel configuration (3-Ch). Differently from what occurs with other amplifiers, LRx 4.300 is not blocked by protection systems immediately below 2 Ohms. 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 4.300 has a bypass subsonic filter (24dB/Oct.) with adjustable frequency, pre-set at 20Hz. It also has a HI-PASS (12dB/Oct.) and a LO-PASS (12-24dB/Oct.) Butterworth crossover with independent frequencies; they can be bypassed through a switch under the setting panel, in the amplifier bottom. Another switch under the setting panel permits to configure the preamplified output (OUT) as additional input (IN B), in order to accept the source second output for Rear system.

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 – Three kits for subwoofer volume remote control:

•VCR01 and 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.

INSTALLATION

AMPLIFIER FIXING

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.

LRx 4.300 FUSE: 30A

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