OBJECTIVES OF VRx PROJECT
VRx project was conceived in order to solve the problems which derive from the installation of a high quality
car audio system. The long and constant work made with professional installers and the use of the most
advanced, currently available technology allowed audison’s designers to attain totally new results in terms of
power, reliability and exceptional versatility above all. “VRx SYSTEM” derived from this: it is a complete line of
integrated electronic circuits made by amplifiers, active crossovers and signal processors, characterised by a
common conceptual system called Open Deck Construction.
Open Deck Construction
It’s the heart of VRx SYSTEM. It indicates the “totally open construction” of VRx SYSTEM. A sophisticated pre
section can accept several modules (MODULAR EXTENSIONS) which are put before the amplifiers and allow
their functioning configuration. The integration between amplifier and signal processors permits to reduce
signal paths as much as possible and to obtain performances which are not commonly attained through
separate units.
Modular Extensions
They are divided into:
• CONTROL EXTENSIONS: signal processing and control modules and cooling modules. They can be used
into all VRx.
• MULTICHANNEL EXTENSIONS: crossover modules which can be employed in one and two channel
amplifiers (VRx1 and VRx2). Multichannel VRx (VRx4 and VRx6) are already supplied with a sophisticated, re-
configurable crossover.
• COOLING DUCT EXTENSIONS: terminals and raccords which allow air ducting inside and outside the heat
sink, directing its flux in order to improve cooling. If cooling modules are not used, Cooling Duct Extensions
can be employed for esthetical purposes.
ABS
®
- AUDISON BALANCED SYSTEM
All VRx amplifiers have balanced inputs and, if supplied with integrated crossover or Multichannel Extensions,
they also have balanced outputs. They use audison cable ABS connectors, which allow balanced connection
through an exclusive panel connector which is as big as standard RCA ones. They can accept signals up to 5V,
in order to be as compatible as possible with all sources which can be found into the market.
VRx AMPLIFIER
While developing VRx project, utmost attention was paid to the following aspects:
• dynamics, which involves power supply and amplifying stage
• reliability and, thus, protection and cooling
• sound quality.
VRx amplifiers have high power, which can guarantee very good dynamics even in car. In order to be able to do
this, power supply is oversized and has the same structure as HV series one.
Power supply is protected from overloads and excessive voltages (due to the car voltage controller breakdown or
to the battery charger fault, for instance). Protection against short circuits or against too low loads onto speakers
outputs were also introduced, as well as in case there is direct current on power signal.
Thermal protection is double: it traditionally controls heat sink temperature but also power supply transformers one.
In order to achieve the best sound quality, VRx use totally symmetrical, pure A class refined drivers made with
discrete components. These are mounted onto separate printed circuit boards with heat sink; this solution
guarantees optimal thermal stability.
Final stages use complementary inverted triplets of bipolar transistors. These components were judged better than
mosfets since they permit to obtain more linearity with the same power.
The accurate calibration of all these designing elements allowed the limitation of feedback factor below 15dB and,
thus, the achievement of outstanding sound features.
- 2 - - 67 -
TPC VRx6 power supply
controller. It must not
be removed.
TFC
(supplied with MAC2)
CONTROL
EXTENSIONS
PRM3 for A channels
CONTROL
EXTENSIONS
DMRX socket for a
future extension. Do
not put any modules
into it.
Socket for:
- VCA1D, given
with VCRDK
CONTROL
EXTENSIONS
VCA
PRM3 for B channels
PRM3 for C channels
SM24
CONTROL
EXTENSIONS
PC36
CONTROL
EXTENSIONS
LD1 VRx6 driver stages.
They must not be
removed.
Canali A
Canali B
Canali C
VRx6.420
Controls under
wooden strip
BYP08 bridge: 4+4 Pins
Modular Extensions
Serial modules
BYP12 bridge: 6+6 Pins
VRX6CD-S VRx6
controls. They must not
be removed.
WHERE TO PUT MODULAR EXTENSIONS
