AVM EVOLUTION A3.2 Instrucciones de operaciones descargar pdf (Pagina 4)

1. Basic information

1.1 Mechanical construction & supply

The case is fully made of aluminium. The audio-connectors are all gold plated to minimize electrical losses

and provide long lasting perfect contacts.

The PA3.2's power supply consists of an oversized toroidal transformer with minimized magnetic stray field

and 10.000 µF of capacitance.

In the A3.2 / A5.2 a switch mode power supply delivers clean, hum-free electrical energy for the analogue

sections of the preamplifier. All voltages are additionally buffered by large capacitors directly in the circuitry

where they are needed. The power amplifiers are fed by a separate switch mode power supply (A3.2)

respective two independent switch mode power supplies - one for each channel (A5.2)

Thus independently of the demanded output power the power amplifier has no influence on the preamp.

1.2 Preamplifier

The input circuits act extremely fast and use special semiconductors for exact and nearly noise free sound

reproduction. SMD technique allows a very compact circuit layout and thus extremely short signal paths.

The volume control is done by highly precise integrated circuits. They allow setting in 0,5 dB steps and their

channel balance is better than 0,05 dB. All this provides an absolutely precise, musical sound reproduction

from lowest to highest listening levels.

If you whish to correct the frequency response at low listening levels or to have more or less treble or bass,

you can activate the sound processor and set the frequency response. For linear reproduction the whole

circuitry is removed out of the signal path by relays and has absolutely no influence.

The preamp section has one balanced XLR input and five RCA-Cinch inputs. Additionally there are three

slots for plug in cards: one phono card, one tuner card and a digital card with three digital inputs.

One fixed level output for recording and a processor in/out for connection of equalizers are provided. The

two preamplifier outputs (RCA-Cinch and XLR) are driven by powerful output stages and can easily handle

longer cables with high capacitance.

1.3 Power amplifier (A3.2 and A5.2 only)

A3.2 and A5.2 use for each channel a separate powerful and efficient digital class-D amplifier. These

amplifiers have an analog feedback loop from output to input. This ensures a nearly load-independent

frequency response and a very good damping factor.

Further highlights are very low output noise, low distortion and an extremely good efficiency. Even when

delivering peak power levels to the speakers they deliver over 90% of the supplied energy to the speakers

and thus produce nearly no heat.

1.4 Tuner (option)

The tuner plug in card can be adapted to different reception situations. you can set bandwidth, and sensitivity

values in order to achieve optimal sound quality from aerial antenna as well as from cable. With it’s high

sensitivity the tuner can also work with a simple indoor antenna. The stereo decoder offers high channel

separation as well as very low noise.

The RDS section (audio data system, not available in all countries) is processor controlled and shows you

station names and texts with additional information about the program you are listening to.

The station memory allows you to store up to 63 stations. It stores not only their frequency, but also the

individual setting of sensitivity, bandwidth and mode (mono/stereo).

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AVM EVOLUTION A3.2 Instrucciones de operaciones Pagina 4