Audison HV Sedici THK Owner's Manual

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 upon a battery voltage of 12 Volts with a 4 Ohms

load and with all channels in function.

PRINTED IN ITALY - Code 10124600

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

in out in out

Mute Remote Power

mono

Speaker L

ABS

Inputs RightLeft

Audison Balanced System

Speaker R

mono

on

peak L

safe

peak R

OWNER'S MANUAL

Car power amplifier

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INTRODUCTION

The HV sedici THK amplifier is the firstborn in a new family of high performance car

amplifiers and other devices called THESIS.

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

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 THK amplifier is constituted by three main parts: preamplifier, final power

stage and power supply.

PREAMPLIFIER

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

general sensitivity can be regulated in the 0.2 ÷ 1V range.

This unit is provided with an exclusion possibility allowing the connection with the

external preamplifier.

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

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

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

by a FET- BJT hybrid circuit in superintegrated CASCODE configuration in a single chip

whose features are: max power supply ± 24 VDC , S/N ratio: 125 dBA (1 KHz - 1V),

Slew Rate: 25 V/µS (20 Vpp), Bandwidth: DC÷1MHz.

FINAL POWER STAGE

T

he balanced or unbalanced audio signal (selectable option) applied at the input can

directly drive the final stage without the preamplifier interposition.

Excluding the preamplifier the final stage sensitivity can be regulated between 1.0 ÷ 5 V.

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

TOMAHAWK 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 and current mirror combination. This circuit is integrated on BJT chips whose

components undergo a laser trim for the maximum tolerances reduction.

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

Make device configuration according to the radio-cassette player requirements, through

the above mentioned controls and regulations.

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

2) Turn radio-cassette player volume control to about 3/4 of maximum volume.

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

PEAK R-PEAK L with high dynamic musical passages.

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

lighting up it means that a distorted signal is coming from the radio-cassette player. In

this case turn radio-cassette player 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 any conditions.

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

themselves or to ground , will cause no damages.

- Temperature protection: anomolous operating conditions or high ambience tempera-

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

(maximum working temperature of the device 80°C) caused intervention of the

protection.

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

supply cables should be mistakenly inverted, the electronic circuitry will be protected by

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

- Protection against continuous output current.

- Protection against excessively low or dangerous loads.

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

malfunction is eliminated you only need to turn off radio-cassette player and turn it back

on in order to have the device function again. The amplifier will return to normal function.

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