4
DESCRIPTION
Audison LRx 5.600:
Five 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 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, to the use of a
pair of BJT for every channel and of two pairs for the sub, this amplifier can easily drive even the hardest
loads and satisfy whatever power needs. It can give 60W on Front and Rear channels and 180W on sub
with 4 Ohm load, 85W on Front and Rear channels and 240W on sub at 2 Ohms in continuous mode.
Power increases up to 170Wx2 at 4 Ohms and to 240Wx1 at 2 Ohms in mono configuration (3-Ch).
Differently from what occurs with other amplifiers, LRx 5.600 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 5.600 has a bypass subsonic filter (24dB/Oct.) with adjustable frequency, pre-set at 20Hz, and three
Butterworth crossovers with independent frequencies: HI/LO-PASS (12dB/Oct.), HI-PASS (12dB/Oct.) and
LO-PASS (24dB/Oct.). Constant Bass function is also available; it permits to control the subwoofer level
whatever the head unit Fader adjustment is.
Four switches under the setting panel in the amplifier bottom allow to choose:
• functioning configuration: Front/Rear and Multichannel;
• 3/5 channel output;
• the activation of a third input dedicated to subwoofer.
They also permit to configure the preamplified output (OUT) as additional input to accept the source
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.
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INSTALLATION
CAUTION!
For the system safer protection, we
recommend the use of a strip fuse
on the cable that connec ts the
batter y 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
ELECTRIC CONNECTIONS
LRx 5.600 FUSE: 50A
