Audison HV SEDICI Owner's Manual

Car power amplifier

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OWNER'S MANUAL

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10.6

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5.3

8.5

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3.2

C µF

8 Ohms

21.0

15.9

660

10.6

495

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12.7

400

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L mH

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4 Ohms

LOUDSPEAKERS IMPEDANCE

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Strada Regina Km 3,5 • I 62018 Potenza Picena (MC) • Tel.[phone] • Fax [phone] • http://www.audison.com

PRINTED IN ITALY - Code 10124600-A

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HI

200

PASS

TRI-MODE CONNECTION (fig. 1)

Hertz

FREQUENCY

HI

PASS

SUBWOOFER

REGULATIONS

All controls are located on top of the device.

- MONO ON-OFF: see MONO connection.

- BALANCED-UNBALANCED: see balanced-unbalanced connection.

- PREAMP ON-OFF: see connection to external preamplifier.

- L-R LEVELS: amplifier sensitivity adjustment , separated for the two channels.

PROCEED AS FOLLOWS

Adjust the device according to the head unit requirements, through the above mentioned

controls and regulations.

1) Set the two L-R LEVELS potentiometers towards minimum (counterclockwise).

2) Turn the head unit volume control to about 3/4 of its maximum volume.

3) Set the two L-R LEVELS towards maximum sensitivity until you get sporadic lighting

of PEAK R-PEAK L leds with high dynamic musical passages.

IMPORTANT: if you should hear distortion phenomena without the PEAK L-R leds

lighting up, it means that a distorted signal is coming from the head unit. In this case, turn

the head unit volume down until there’s no longer any distortion. Repeat calibration

operation omitting step 2.

PROTECTIONS

The device is provided with several electronic protections which protect the amplifier

from dangerous or wrong functioning conditions , avoiding to interfere with the music

signal in order to get the best performances in every condition.

- Outputs protection: any type of short circuit on the speaker wires , be it between

themselves or to ground , will cause no damages.

- Temperature protection: anomalous use conditions or high ambience temperature

- Protection against inverted polarity of the power supply: if the power supply cables

(maximum working temperature of the device 80°C), causes the protection intervention.

(above 60°C), that doesn’t allow the amplifier to discharge the produced heating

polarities should be mistakenly inverted, the electronic circuitry will be protected by

burning the external fuse, that will have to be replaced with an identical one.

- Protection against continuous current in the output.

- Protection against excessively low or dangerous loads.

A front red LED (SAFE) indicates intervention of protection circuits. Once the cause of

malfunctioning is eliminated, you need to turn head unit off and turn it back on in order

to have the device function again. The amplifier will function normally.

7

amplifiers and other devices called THESIS.

It is endowed with highly innovative technologies and circuit solutions and its realization

INTRODUCTION

The HV sedici amplifier is the first born in a new family of high performance car

required big efforts and investments for research and development.

The purpose was to realize an amplifier that had to be a "milestone" in the evolutive history

of AUDISON products.

Its structure in the circuit layout can be identified at two levels: the first one (power) is

entirely on the mother circuit board and it collects all components which handle high

currents and need warmth dissipation; the second one (signal and control) is located on

special surface mounting devices which perform all complex functions of the whole

device.

This peculiar design technique allowed the study and optimization of the signal paths and

the blocking of the interactions among the different stages.

The HV sedici amplifier is constituted by three main parts: preamplifier, final power stage

and power supply.

PREAMPLIFIER

HV sedici amplifier is supplied with an independent preamplifier unit, where the general

sensitivity can be adjusted in the 0.2÷1V range.

This unit can be disactivated, allowing the connection with an external preamplifier.

2

The input signal is applied to ABS (Audison Balanced System) connector in balanced or

unbalanced way, and to MA-1X module through two polypropylene capacitors.

MA - 1X circuit, which constitutes the input interface for audio signals, is characterized

by a FET- BJT hybrid circuitry in CASCODE configuration and it has been superintegrated

in a single chip whose features are: max power supply: ±50 VDC, S/N ratio: 125 dBA,

Slew Rate: 120 V/µS, Bandwidth: DC÷1MHz.

FINAL POWER STAGE

Balanced or unbalanced audio signal (it can be selected) applied to the input can directly

drive the final stage without the preamplifier interposition.

By disactivating, the preamplifier, the final stage sensitivity can be between 1.0 ÷5 V.

The signal coming from the MA-1X module arrives in balanced connection to the

V-AMP 12 LV module which makes the driving of the final stages in voltage and the

thermic stability control.

The internal circuit is characterized by a double complementary differential amplifier in

CASCODE connection with FET-BJT and current mirror combination. This circuit is

integrated in two custom chips (CDAP - CDAN) whose components undergo a laser trim

for the maximum tolerances reduction.