AUDISON VRx 4.300EX User Manual

Owner’s manual

Power amplification integrated system for cars

2000

EDITION

62018 Potenza Picena (MC) Italy • Tel. ++39.0733.870870 • Fax ++39.0733.870880 • http://www.audison.com • e-mail: [e-mail]

is a division of

AUDISON’S MEASUREMENT STANDARDS

Power measures taken according to audison standard 1998 edition.

- 12 VDC and 13.8 VDC.

- 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.

- 69 -

12 12 24 HI-PASS 12/LO-PASS 24

✓✓✓✓

HI-PASS; LO-PASS; BYPASS HI-PASS; BYPASS LO-PASS; BYPASS HI-PASS; LO-PASS; BYPASS BYPASS

CROSSOVER SLOPE

CONTINUOUS ADJUSTMENTS

PRE-OUT FUNCTION

TERMINALS FOR PROTECTING CONNECTIONS; IT IS POSSIBLE TO INVERT THEIR FRONT
PANEL IN ORDER TO FIX THEM WITH HIDDEN SCREWS.

RACCORDS BETWEEN TWO AMPLIFIERS FOR PROTECTING CONNECTIONS; PROVIDED
WITH A 24K GOLD PLATED BRASS PLATE WHICH CAN BE PERSONALISED.

ANALOGUE PHASE CONTROL. CONTINUOUSLY ADJUSTABLE PHASE BETWEEN 0˚ AND 360˚, SELECTION ON THREE FREQUENCY RANGES (40-200 HZ; 200-800 HZ; 800­4500 HZ). BY-PASS SWITCH.

ONE BAND PARAMETRIC EQUALISER WITH CONTINUOUS CONTROLS FOR: FREQUENCY (SELECTABLE IN THREE STEPS, FROM 20HZ TO 20KHZ), GAIN (-9DB, +9DB), BAND
WIDTH (Q FROM 1 TO 4). BY-PASS SWITCH.

ADDITIONAL MODULE FOR CONTROLLING SEVERAL CHANNELS. IF IT IS MOUNTED IN A FURTHER BTX2, IT CONTROLS ALSO REAR CHANNEL WITH ONLY ONE VCRDK.

GRADUAL INTERVENTION COOLING SYSTEM CONTROLLED BY THE AMPLIFIER TEMPERATURE. MIN. STARTING THRESHOLD TEMPERATURE: 44˚C; MAX. EFFICIENCY TEMPERATURE:
74˚C. IT CONSISTS OF TFC CONTROLLER MODULE TO MOUNT INSIDE THE AMPLIFIER AND TWO FANS GROUPS, TO PLACE INTO A TERMINAL OR A RACCORD.

TRM4
TRM6
RC08
RC10
RC12

MULTICHANNEL

EXTENSIONS

HI/LO-PASS BAND/HI-PASS LO-PASS MONO

BALANCED PRE OUT

HL12 BH12

LM24

HL24 BSA1

PRM3
SM24
PC36
DSC1
VCRDK
VCA1D
BTX2
MAC2

CONTROL EXTENSIONS

AMPLIFIERS

VRx 1.500

VRx 2.150 VRx 2.250 VRx 2.400 VRx 4.300 VRx 6.420

POWER @ 13,8V

HOUSING DUCTS FOR MAC2 FANS.

24DB/OCT. MONO SUBSONIC FILTER. CONTINUOUSLY ADJUSTABLE FREQUENCY BETWEEN 14 AND 36HZ. BY-PASS SWITCH.

DEPENDENT ADJUSTMENTS
INDEPENDENT ADJUSTMENTS

AMP-OUT/PRE-OUT SWITCHING

✓✓✓✓

CUT OFF FREQUENCIES 40-5k

BAND-PASS LO 40-2k

BAND-PASS HI 150-5k

HI-PASS 150-5k

40-90

LO-PASS 40-90

HI-PASS 40-120

500x1

75x4+85x2

560x1
1080x1
2000x1

0.02
100

8-4-2-1

✓

75x2

110x2
180x2
240x2
360x1
480x1

0.02
100

✓

8-4-2-1

8-4-2

✓

125x2

160x2
280x2
420x2
560x1
840x1

0.02
100

✓

8-4-2-1

8-4-2

✓

200x2

250x2
450x2
580x2
900x1

1160x1

0.02
100

✓

8-4-2-1

8-4-2

✓

65x4+80x2

120x4+150x2
75x4 (4Ω)+165x2 (2Ω)
75x4 (4Ω)+250x2 (1Ω)

75x4+330x1

75x4 (4Ω)+500x1 (2Ω)

110x4+430x1

0.02
100

✓

Ch.A & Ch.B: 8-4-2; Ch.C: 8-4-2-1

Ch.A & Ch.B: 8-4; Ch.C: 8-4-2

✓✓✓

75x4

110x4
175x4
220x4

102x2+380x1

90x2 (4Ω)+530x1 (2Ω)

350x2
440x2

0.02
100

✓

Ch.A & Ch.B: 8-4-2-1

Ch.A & Ch.B: 8-4-2

✓✓

Nominal Power @ 12V

6 ch. mode - 4Ω

1222 4 6

Number of channels

Distortion - THD (1 KHz)
A weighed S/N ratio

0.15-1.5/0.5-5 0.15-1.5/0.5-5 0.15-1.5/0.5-5 0.15-1.5/0.5-5 0.15-1.5/0.5-50.15-1.5/0.5-5

Hi-Lo input sensitivity
Use in bridge

✓✓✓ ✓✓

Use in tri-mode
Stereo load impedance
Mono/bridge load impedance
PRM3 option

✓✓✓✓ ✓✓

SM24 option

✓✓✓✓ ✓✓

PC36 option

✓

DSC1 option

✓✓✓✓ ✓✓

BTX2 option

✓✓✓✓ ✓✓

VCRDK option

✓✓✓✓

HL12 option

✓✓✓

BH12 option

✓✓✓✓

LM24 option

✓✓✓✓

HL24 option

✓✓✓✓

BSA1 option

✓✓✓✓ ✓✓

MAC2 option - with TRM or RC

✓✓✓✓ ✓✓

RC08 - RC10 - RC12 option

NP - Nominal Power (+10%, -5%) @ 4Ω - 12V - 0,3% THD.

AUTOMATIC DYNAMIC PROCESSOR FOR SUBWOOFER RESPONSE CONTROL.
SYSTEM FOR MASTER VOLUME REMOTE CONTROL IF USED IN BTX2 OR FOR LEVEL CONTROL OF ANY WAYS IN A MULTIAMPLIFIED SYSTEM IF USED IN VRX. BASED ON

VCA1D WITH DIGITAL CONTROL.

ABS BALANCED LINE TRANSMITTER. THREE STEP GAIN CONTROL (0DB, +3DB, +6DB) AND PEAK LED. OPTIONAL VCA MODULE FOR LEVEL CONTROL. YOU CAN REALISE
MASTER VOLUME IN FRONT/REAR SYSTEMS USING TWO BTX2, ONE VCRDK AND ONE VCA1D.

Ω
Ω

dBA

VRMS

*

*

6 ch. mode - 2Ω
6 ch. mode - 4/2Ω
6 ch. mode - 4/1Ω
5 ch. mode - 4Ω
5 ch. mode - 4/2Ω
5 ch. mode - 2Ω
4 ch. mode - 4Ω
4 ch. mode - 2Ω
4 ch. mode - 1Ω
3 ch. mode - 4Ω
3 ch. mode - 4/2Ω
2 ch. mode - 4Ω
2 ch. mode - 2Ω
2 ch. mode - 1Ω
1 ch. mode - 4Ω
1 ch. mode - 2Ω
1 ch. mode - 1Ω

W

W

W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W

%

dB/oct.

Hz

HI-PASS STEREO
LO-PASS MONO

COOLING DUCT EXTENSIONS

✓✓✓✓ ✓✓

TRM4 - TRM6 option

- 1 -

- Objectives of VRx project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 2

- General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 3

- VRx - MODULAR EXTENSIONS: CONTROL EXTENSIONS

- PRM3 stereo parametric equaliser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 6

- SM24 24 dB/oct. mono subsonic filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 6

- PC36 360° phase controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 7

- DSC1 sub dynamic control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 8

- VCRDK digital remote volume control kit (VCRD + VCA1D) . . . . . . . . . . . . . . . . . . . . p. 8

- MAC2 forced air modulated cooling system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 9

- Insertion of fans group into Terminals and Raccords . . . . . . . . . . . . . . . . . . . . . . . . . p. 10

- BTX2 stereo balancer/preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 11

- VRx - MODULAR EXTENSIONS: MULTICHANNEL EXTENSIONS

- HL12 12 dB/oct. HI/LO-PASS crossover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 14

- BH12 12 dB/oct. BAND/HI-PASS crossover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 15

- LM24 24 dB/oct. LO-PASS mono crossover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 16

- HL24 12 dB/oct HI-PASS - 24 dB/oct. LO-PASS crossover . . . . . . . . . . . . . . . . . . . . . p. 17

- BSA1 Stereo balanced pre-out repeater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 18

- Updating of short guide under wooden strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 19

- VRx - MODULAR EXTENSIONS: COOLING DUCT EXTENSIONS

- Terminals and Raccords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 22

- Terminals: Installation of TRM4 - TRM6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 23

- Raccords: Installation of RC08 - RC10 - RC12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 24

- Wooden strip removal - Logo rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 25

- VRX INSTALLATION

- General recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 28

- Cables size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 29

- External fuse size and location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 30

- Internal fuse replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 31

- VRx size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 32

- VRx - 1.500

- Technical features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 34

- Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 35

- Controls and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 36

- Short guide under wooden strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 37

- Where to put modular extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 38

- VRx 1.500 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 39

- VRx - 2.150 - 2.250 - 2.400

- Technical features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 42 - 44

- Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 45

- Controls and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 46

- Short guide under wooden strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 47

- Where to put modular extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 48 - 49

- VRx 2.150 - 2.250 - 2.400 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 50

- VRx - 4.300

- Technical features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 52

- Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 53

- Controls and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 54

- Short guide under wooden strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 55

- 12dB/oct. Sub filter slope configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 56

- 24dB/oct. Mono Sub filter slope configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 57

- Where to put modular extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 58

- VRx 4.300 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 59

- VRx - 6.420

- Technical features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 62

- Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 63

- Controls and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 64

- Short guide under wooden strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 65

- Configurations: front/rear, multichannel, A-B-C amplifiers in bridge . . . . . . . . . . . . . p. 66

- Where to put modular extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 67

- VRx 6.420 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 68

- Audison’s measurement standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 69

VRx6.420 connections

Inputs and outputs: connection with C

amplifiers in bridge

Power supply, remote and accessories Inputs and outputs:

stereo connection

Inputs and outputs: connection with A, B

and C amplifiers in bridge

- 68 -

Please see “Technical
Features” and “External
fuse size and location” in
order to choose the
proper external fuse.

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, re­configurable 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

GENERAL FEATURES

Conformity with “E” norms

VRx models have a RF filter which makes them suitable to the new norms about radio-frequency disturbances
emission inside cars before any others. A “common mode”, adequately dimensioned filter choke was inserted
next to power supply input in order to prevent sudden voltage drops which commonly occur in similar circuit
typologies.

Thermal limiter onto transformers

A very effective protection circuit was put onto transformers to prevent them from exceeding temperatures
which might be dangerous for the amplifier integrity. This circuit intervenes by having VRx stop; the amplifier
will start to function again only after the necessary cooling and reset operation (on and off again) will have to
be carried out.

LNS (Line Noise Suppressor) circuit

LNS circuit allows the system low frequency disturbances rejection, reducing the ordinary noise due to car
electrical parts (alternator, electronic injection, etc.). It does not affect sound and is effective in most cases. The
special switch which is onto all models except VRx 6.420 (where it is not indicated since it is constantly active)
permits to check if its intervention is necessary in case there are several VRx configured in cascade.

TPC.2 (Twin Power Controller) power supply stage handling system

TPC.2 allows to increase power supply stage handling speed (10 times approx.). This implies higher available
impulsive power and lower stress of filter capacitors.

OCN (Off Current Null) and DVP (Damaging Voltage Protection) circuits

Thanks to OCN circuit, VRx models are the only ones to be in conformity with max absorption new standards
when amplifier is off. Their value (0.00005A) makes them be 10 times below the maximum allowed limit. DVP
circuit protects VRx amplifiers from voltage increases and electrostatic discharges.

Synchro-PWM power supply

Power supply stage consists of two totally separate and synchronised sections: one for positive and one for
negative voltages. It is therefore possible to satisfy the final stage current demands more promptly,
guaranteeing higher energy and speed with low frequencies.

Final stage driver modules: LD1.2 and DHF.1

Final stage driver modules (LD1.2 for VRx2-4-6; DHF.1 for VRx1) sum up all audison’s experience of amplified
sound characterisation. Subjected to continuous studies and improvements, they further increase linearity and
acoustic impact with low frequencies in the current VRx version.

DFL (Distortion Frequency Limiter) circuit

DFL circuit is a real electronic protection for speakers. It limits max distortion factor to 6% onto low frequencies
and to 2% onto high ones. This implies constant and systematic control onto all audio range and wide safety
margin for all speakers in the system.

Sub input (VRx6.420)

VRx6.420 PRE OUT output can be used as IN Sub input in order to use this model with the head units which
have a third preamplified output for the subwoofer, exploiting the amplifier internal filter.

RGP input stages protection

(Resettable Ground Protection)

RGP is an electronic protection able to detect high direct current passage onto input ground; it acts by putting
the device in “stand by” condition (safety). The main feature of this circuit is its being able to work even when
the amplifier is off, allowing the interruption of current passage towards input stages in case of power supply
transformers short circuit. It perfectly guarantees the system safety since it consists of several sensors.

Three way, big size terminal block

VRx terminal block can accept cables up to 2 gauge section. A third positive pole houses the external capacitor
(+C) which, thus, directly acts onto power supply voltage seen by the amplifier. This minimises voltage drop
and cable overheating. Fastening screws are protected by a polycarbonate door. Inside the terminal block there
is also a location for a strip fuse which can be inspected through the device bottom, that protects electronic
circuitry and external capacitor. This solution allows the installation to be cleaner and the terminal block-fuse
holder system to have 300A approx. max capacity.

- 3 -- 66 -

Front/Rear configurations

Multichannel Configurations

A, B and C bridged amplifiers configurations

= Released switch.

= Pushed switch.

IN2 = Sub level: Sub is driven by IN1 + IN2. Fader is used to adjust sub level.
IN2 = Not used: Sub and Front driven by IN1.

Channels are driven by PC36 (PC36 always takes signal from IN1)
Sub is driven by IN1 + IN2 NO FADING SUB (with active Constant Bass)

Note:

Channels are driven by PC36 (PC36 always takes signal from IN1).
Sub is driven by IN1 + IN2.

Note:

MA, MB and MC on position 2 (mono)

VRx6.420

=Switch involved

in configurations.

- 65 -

Short guide under wooden strip

It shows internal crossover, outputs configurations and controls meaning

VRx6.420

- PRM3 stereo parametric equaliser

- SM24 24dB/oct. mono subsonic filter

- PC36 360˚ phase controller

- DSC1 sub dynamic control

- VCRDK digital remote volume control kit
(VCA1D module + VCRD adjuster)

- VCA1D VCA1D module VRx - BTX2

- MAC2 forced air modulated cooling system
(2 fans with spacers to put into Terminals and Raccords, plus TFC control module)

- BTX2 stereo balancer/preamplifier

- 5 -

VRx MODULAR EXTENSIONS:

CONTROL EXTENSIONS

WARNING!

Apply to Audison’s specialised installation centres for the installation and

configuration of modular extensions described in this section

2000

EDITION

K1 - Bal/Unbal inputs

switch.

K2 -It selects sensitivity

range of all inputs.

K3 - In Sub/Pre Out

switch. ABS sockets,
normally used for Pre
output, can be also
employed as additional
input for Sub.

K4 - Bal/Unbal switch for

PRE output. It is

possible to have a
balanced output
signal even with an
unbalanced input one.
Put K4 on B (Balanced)
only if K3 is on O (Out)

M1, M2, ..., M6 - Switches

to select the amplifier
functioning modes. M1,
M2 and M3 act on
crossover and on inputs
connection; M4, M5
and M6 act on outputs.
Please see the manual
in order to use them; it
indicates VRx6 main
functioning modes.

F1- Mono LO-PASS filter

for sub, 24dB/oct.
slope.

F2, F3, F4, F5, F6 - 12dB/oct. stereo crossover

filters. The pairs (F4, F5) and (F3, F6) form two
band-passes.

LA,LB, LC - Input sensitivity adjustment of A and

B amplifiers pairs respectively.

MA, MB, MC - Mono/Stereo switches of A, B and

C amplifiers respectively.

VRx6.420

Controls description

ON - Green led

It indicates the amplifier is on.

SAFETY - Red led

It indicates protection intervention:
excessively high temperature or
output anomalies (direct current,
short circuit or dangerously low load
impedance). Protection intervention
stops the amplifier functioning.
Switch the amplifier off; when
anomaly is eliminated, switch the
amplifier on again.

PEAK CHANNELS LA - LB - RA ­RB - Orange leds

They light up when one or more VRx
amplifiers are about to attain
distortion threshold. They are useful
to adjust inputs sensitivity.

- 64 -

Short guide

Leds

Controls under

wooden strip

Short guide

A Channels

B Channels

C Channels

Controls and functions

- 6 - - 63 -

Block diagram

VRx6.420

Optional modules

Controls panel

Functions diagram

WF - Frequency adjustment.
WB - SM24 ACTIVE (ON)/BYPASS (OFF) switch.

Controls description

VRx1 and VRx2 amplifiers can use one PRM3
module; VRx4 amplifiers can use two; VRx6
amplifiers can use three. This allows the insertion
of a parametric equalisation on each way of a
multiamplified system made with VRx amplifiers.

Warning: There is a DIP Switch to be set on
ON into PRM3.1 modules.

DIP Switch

VRx Control Extensions PRM3

Stereo parametric

equaliser

Gain: ± 9 dB

Frequencies ranges: 20Hz÷200Hz; 200Hz÷2KHz; 2 kHz÷20KHz

Controls panel

Functions diagram

Q adjustment: 1÷4

Controls description

SM24 is monophonic since it was designed in
order to be used with subwoofer.
It only acts on the Right channel of
preamplified signal, therefore:

• the amplifier it drives must be configured in
mono;

• if its output is sent to an external amplifier
(possible solution with VRx4 and VRx6), only the

Right Channel of pre output must be used.

VRx Control Extensions SM24

Mono subsonic filter

Frequency range: 14 Hz ÷ 36 Hz

24dB/oct. HI-PASS

Short guide

Short guide

One band stereo parametric equaliser with
frequency, gain and bandwidth (Q) control.

Monophonic subsonic filter for subwoofer.

JF - Frequency adjustment.
JM - Switch for activating frequency ranges multiplier.
JB - Active (ON)/BYPASS (OFF) switch.
JX - Frequency ranges switch.
JL - Level adjustment.
JQ - Q adjustment.

PC36 frequency range must be set according to the cut-off frequency chosen for HI-PASS filter it must be used with.

PC36 module is able to vary relative phase
between two ways of a multiamplified system. Its
purpose is to make the emission of a speakers
system, located in different places in car, more

homogeneous. Generally speaking, PC36
module allows you to put the HI-PASS filtered way with electronic crossover in phase with regards to the one which
is LO-PASS filtered in a bi-amplified system. It is possible to use two PC36 in a three way amplified system: one to
align tweeters with regards to midwoofers and one to align midwoofers with regards to subwoofer.
Used into VRx4 and VRx6, PC36 allows the front system phase alignment with regards to subwoofer. Applied into
VRx2 and VRx1, it permits to put all crosses of a multiamplified system in phase if it is used together with HI-PASS
sections of HL12, HL24, BH12 modules or with BAND-PASS sections of BH12.

Pre-select frequencies ranges through jumpers according
to cut-off frequencies of the HI-PASS filter it is used with.
PC36 is originally set on 40 ÷ 200 Hz.

- 7 -

VRx Control Extensions PC36

Frequencies ranges: 40Hz÷200Hz; 200Hz÷800Hz; 800Hz÷4,5kHz

Phase range: 0°÷360°

360˚ phase controller

Controls panel

Functions diagram

YH - Phase adjustment.
YB - Switch: PC36 ACTIVE (ON)/BYPASS (OFF).

Controls description

Short guide

Freq. range 40Hz÷200Hz

Freq. range 200Hz÷800Hz

Freq. range 800Hz÷4.5kHz

Analogue phase controller acting on the higher
frequencies of a multiamplified audio chain.

WARNING

The use of PC36 into VRx1 and VRx2 depends

on the installation of HL12, BH12, HL24

multichannel extensions, since PC36 acts only

on HI-PASS section.

Where PC36 acts:

VRx6.420

Technical features

POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 ÷ 15 VDC

IDLING CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.6 A

IDLING CURRENT WHEN OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .< 0.04 mA

CONTINUOUS NOMINAL POWER Tol.: (+10%/-5%); 0.3% THD; 12 VDC

A,B,C stereo ch. on 4 Ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2x65W + 2x65W + 2x80 (RMS)

CONTINUOUS POWER 6 CHANNELS Tol.: (+10%/-5%); 1% THD; 12.6 VDC

A,B,C stereo ch. on 4 Ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2x75W + 2x75W + 2x85 (RMS)

CONTINUOUS POWER 6 CHANNELS Tol.: (+10%/-5%); 1% THD; 13.8 VDC

1) A,B,C stereo ch. on 4 Ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . .2x75W + 2x75W + 2x85 (RMS)

2) A,B,C stereo ch. on 2 Ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . .2x120W + 2x120W + 2x150 (RMS)

3) A,B stereo ch. on 4 Ohms, C stereo ch. on 2 Ohms . . . . . . . . . . .2x75W + 2x75W + 2x165 (RMS)

4) A,B stereo ch. on 4 Ohms, C stereo ch. on 1 Ohm . . . . . . . . . . . .2x75W + 2x75W + 2x250 (RMS)

CONTINUOUS POWER 5 CHANNELS Tol.: (+10%/-5%); 1% THD; 13.8 VDC

5) A,B stereo ch. on 4 Ohms, C bridged ch. on 4 Ohms . . . . . . . . . .2x75W + 2x75W + 1x330 (RMS)

6) A,B, stereo ch. on 4 Ohms, C bridged ch. on 2 Ohms . . . . . . . . .2x75W + 2x75W + 1x500 (RMS)

7) A,B stereo ch. on 2 Ohms, C bridged ch. on 2 Ohms . . . . . . . . .2x110W + 2x110W + 1x430 (RMS)

CONTINUOUS POWER 3 CHANNELS Tol.: (+10%/-5%); 1% THD; 13.8 VDC

8) A,B,C bridged ch.on 4 Ohms . . . . . . . . . . . . . . . . . . . . . . . . . . .1x240W + 1x240W + 1x300 (RMS)

9) A,B bridged ch. on 4 Ohms, C bridged ch. on 2 Ohms . . . . . . . . .1x220W + 1x220W + 1x430 (RMS)

THD DISTORTION (1 kHz; 90% Nominal Power) . . . . . . . . . . . . . . . . . . . . . .0.02%

IMD DISTORTION (90% Nominal Power) . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.04%

BANDWIDTH (-3dB; Nominal Power) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Hz ÷ 70 kHz

S/N RATIO (A weighed - 1 VRMS input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100 dBA

REMOTE IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 ÷ 15 VDC

REMOTE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 VDC - 150 mA

INPUT SENSITIVITY (high) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.15 ÷ 1.5 VRMS

INPUT SENSITIVITY (low) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.50 ÷ 5.0 VRMS

INPUT IMPEDANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 kOhms

LOAD IMPEDANCE (stereo) ch.A and ch.B . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 4 - 2 Ohms

LOAD IMPEDANCE (bridged) ch.A and ch.B . . . . . . . . . . . . . . . . . . . . . . . . .8 - 4 Ohms

LOAD IMPEDANCE (stereo) ch.C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 4 - 2 -1 Ohm

LOAD IMPEDANCE (bridged) ch.C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 4 - 2 Ohms

SIZE (W x H x D) mm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .240 x 64 x 585

SIZE (W x H x D) inches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9.4 x 2.5 x 23

INTERNAL FUSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80A

ABSORBED CURRENT AT MAXIMUM MUSICAL POWER - EXTERNAL FUSE CHOICE

13.8V - configuration 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33A

13.8V - configurations 2) and 8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64A

13.8V - configurations 3) and 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47A

13.8V - configurations 4) and 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66A

13.8V - configurations 7) and 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80A

Measures were realised through a test-set consisting of Rohde & Schwarz UPD audio analyser, HP 6453A power supply
(200A continuous) and 14F capacitive booster made with audison cable Superfarad capacitors.

Please always choose a fuse of equal or slightly higher value (max 10%) than indicated.
Note:

The use of MAC2 cooling system is strongly recommended when the amplifier is employed at full power with 1 Ohm
stereo or 2 Ohm bridged loads.

- 62 -

- 8 -

VRx6.420

2000

EDITION

- 61 -

Dynamic Sub Control

Controls panel

VRx Control Extensions DSC1

Dynamic Sub Control

Functions diagram

Controls description

PG-

Gain adjustment

PF -Frequency adjustment
PT -Time delay adjustement

Short guide

It is a parametric pole which
permits to make up for
subwoofers volumetric
inadequacy by having their low
frequencies gain extent and
impact.
DSC1 adjusts its intervention by
increasing it at low signal levels
and avoiding the amplifier
saturation. Its controls allow to
choose frequency, intervention
and gain.

It consists of a cooling group formed by a pair of fans with spacers and by a temperature control module (TFC)
to put inside VRx amplifiers.
The fans group is placed inside Raccords and Terminals and adapted to several lengths through spacers. VRx
amplifiers have a power supply connector dedicated to the cooling group under the power supply terminal blocks
panel. Raccords and Terminals act as ducts for cooling air and have the esthetical function of covering connection
cables. One terminal (TRM4, TRM6) with MAC2 kit is enough for the cooling system correct functioning. If you like

to put two VRx one after the other, you have to use a suitably long
Raccord (RC08, RC10, RC12)
which, if necessary, can also be
supplied with MAC2, installed
into the second VRx. The end of
the second VRx (inputs and warm
air output side) is able to accept
another Terminal (TRM4, TRM6) for
esthetical reasons. Raccords and
Terminals are chosen according to the size
of used cables and connectors, while the installation of one or
more MAC2 depends on VRx amplifiers configuration.

VRx Control Extensions MAC2

Forced air cooling system

- 9 -

System temperature control kit.

Fans group

VCRDK

It consists of VCRD adjuster and
of VCA1D, a high performances
digital control module. It can be
used to adjust the volume of sub
or of every VRx amplifier in the
system.

If it is installed into BTX2,
it permits to realise Master
Volume Control. Thanks to a
single VCRD adjuster connected
to the main BTX2 (Master),
supplied with VCA1D module
(VCRKD kit), it is possible to
adjust the volume of other stereo ways through as many secondary BTX2 (Slave) connected in cascade and supplied
with VCA1D modules. VCA1D modules are available also individually. Master Volume Control configuration
is necessary when you want to have volume independent general adjustment in multichannel systems for Front, Rear
and Sub outputs of head units supplied with them. The control microprocessor permits to store and recall a level;
this function is useful to keep the reference calibration in a multiamplified system, for instance. If the latter totally
consists of VRx1 or VRx2 amplifiers, the installation of one VCRDK for every amplifier would allow the level
adjustment of each way of the system.

Some stickers allow VCRD customisation according to its function. It is also

possible to remove its housing in order to easily mount it behind a panel, while VCRD front panel stays visible.

VRx Control Extensions VCRDK and VCA1D

Digital remote volume control kit

VCRD

VCA1D

Kit for sub remote volume control, supplied
with VCA (Voltage Controlled Amplifier)
with digital control.

TFC module