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FEATURES
VR 404, VR 404XR. 4 channels amplifiers with very high acoustic performances. Every
functional, acoustic and aesthetical aspect has been carefully taken into consideration by using
innovative solutions and high quality components, paying meticulous attention to details and
providing accessory functions which allow the maximum practicality. PWM controlled power
supply uses MOSFET transistors which allow a significant power capacity without slackening
when the battery voltage diminishes. The final stage in the input employs a complementary
couple of constant current polarised differentials (through LED diodes) with clearly
advantageous results in terms of stability and timbre precision. The power stage is made of a
TRIPLE DARLINGTON for the maximum output current linearization, with final transistors
able to bear higher currents than those which are normally required by the most demanding use.
VR 404 has four PRE inputs, a BY-PASS output and an AMBIENT EQUALIZER for the
acoustic front expansion; the two channels couples can work in MONO and they can be driven
by only two PRE inputs.
VR 404XR has also one HI-PASS and one LOW-PASS crossover filters (with a variable “Q”
factor) which can be adjusted separately and which can’t be disactivated, with 12dB/Oct.
slope.
Because of these features your VR amplifier can give you only the very best emotions in
listening to music. Audison thank you for rewarding their work which is always aimed at
reaching the very best results.
PRECAUTIONS
·In order for this device to function properly it's important that it is installed in a spot where
the temperature doesn't fall below 0°C or rise above 55°C.
· It must be installed in a dry and well ventilated spot.
· The power supply voltage is 12 VCC with negative to ground. Make sure that the
characteristics of the vehicle electrical system are compatible with this device.
· For safe driving we advise to listen to music at a volume level that won't drown external traffic
sounds.
INSTALLATION
For mounting use 4 self-threading screws and protective plastic rings, provided. For a very
good result we suggest to use audison cable products to complete your installation. These
include: power cables, signal cables, speaker wires, RCA connectors and all accessories
needed to complete the wiring.
WARNING
· INPUTS: If the radio-cassette player doesn't share the output GND with the chassis, the
braided shield of the shielded cable must be connected to the radio-cassette player chassis.
· OUTPUTS: Never connect the -R and -L outputs to ground or to each other. If a crossover
filter is used be sure that its two channels don't have a common ground.
· REGULATIONS: If you hear distortion phenomena at moderate volume levels, it means that
a distorted signal is coming from the radio-cassette player. Turn radio-cassette player volume
down until there's no longer any distortion. Then adjust the calibration levels of the amplifier
until you hear slight saturation phenomena.
ENGLISH
VR 404
FRONT AND REAR SYSTEM (HI-PASS) AND SUBWOOFER (LO-PASS)
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