Manual Audison Thesis HV Venti (page 5 of 25) (English)

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The ﬁ nal power stage uses an innovative topology, which aims at increasing Class “A” polarization as much as possible.

The whole input circuit is balanced up to the ﬁ nal stage “Front End”, while the ampliﬁ er’s conﬁ guration is “Dual Mono”.

In order to avoid electro-magnetic interferences, no high current is passed on the main board, with the exception of power

supply terminals; this solution was achieved through the use of a second board that is located under the main board. This

second board is used to carry the large power supply current to the ﬁ nal stage.

As in the VRx series, the PWM Sincro conﬁ guration was employed in the power supply stage. It was chosen due to its

response time; obviously, since the conﬁ guration is Dual Mono, four power supplies were employed.

Two more power supplies are used in the signal stage, one for each channel, realised in a high efﬁ ciency conﬁ guration.

An innovative function called “Dual Power “ was introduced which can predict the ampliﬁ er’s output power by choosing

between two distinguished conﬁ gurations called Hi Current and Hi Power.

In the Hi Current conﬁ guration the ampliﬁ er delivers 200W at 4 ohm and can also be used at 2 and at 1 ohm; this

conﬁ guration is recommended when you want the ampliﬁ er to work with really difﬁ cult loads.

In the Hi Power conﬁ guration the ampliﬁ er delivers 400W at 4 ohm and it can also be used at 2 ohms; Hi Power conﬁ guration

is recommended for 4-ohm loads.

Obviously, the ampliﬁ er easily drives minimum loads equal to 1 ohm in Hi Current conﬁ guration and to 2 ohms in Hi Power

conﬁ guration, but remember, there will necessarily be a slight drop in terms of sound quality.

In order to switch the conﬁ guration, you have to remove the ampliﬁ er’s cover and place four minifuses into the special

slots. This operation can only be made when the ampliﬁ er is off both for technical reasons and for obviously safety

reasons, since inside the HV venti there are voltages over 150V!

You also have to remove the cover in order to insert the crossover module, which is provided as factory option.

In order to manage these unique features, a control unit called ASC (Ampliﬁ er Status Controller) was specially

designed. A separate microprocessor controls this function.

Installing the ampliﬁ er was a very important design concern due to the signiﬁ cant weight of the HV venti. In order to install

it, you must ﬁ rst found a solid position to install the bottom mount plate. The ampliﬁ er then mounts to this plate.

Finally we accurately looked after aesthetics, taking functionality into account as well.

In order to satisfy the cosmetic expectations of the potential HV venti owner, the ampliﬁ er was equipped with a special

tempered glass cover and internally lit using white coloured LEDs, recently introduced into the market.

The internal light and ASC display can be turned on in demo mode for demonstration purposes through an external 12

V power supply.

Exuding more exquisite ﬁ t and ﬁ nish, and to make its aesthetics very long lasting, all materials used were treated with

galvanic methods, eliminating painted ﬁ nishes.

3 • ELECTRONICS

a) Preampliﬁ er

It is made of two groups, Front End pre-ampliﬁ er and control unit.

The whole stage is balanced up to the driver outputs.

90 V separate the power supply voltage.

The pre-ampliﬁ er can be bypassed with the PRE ON/ PRE OFF switch. If the pre-ampliﬁ er is bypassed (PRE OFF),

the whole pre-ampliﬁ cation unit is disabled and, as a consequence, also some controls are bypassed, except for IN

MODE and OUT MODE. In this case however you can still insert the factory provided electronic crossover. Of course by

bypassing the internal pre-ampliﬁ er, you will have to use an external pre-ampliﬁ er and it will have to be placed near the

musical signal source. In order to exploit the plus points of an external pre-ampliﬁ er, you will have to carefully choose a

device with higher quality than the one factory provided and to use very high quality cables for the connections.

Front End:

ABS balanced inputs with balanced bypass outputs (available in both PRE ON and PRE OFF conﬁ gurations).

Decoupled input stage through two polypropylene capacitors in each channel (available in both PRE ON and PRE OFF

conﬁ gurations).

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Audison Thesis HV Venti Manual

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