Viola Systems Spirito Reference Series Preamplifier Manual de usuario descargar pdf (Pagina 3)

The Viola Bravo stereo power amplier has been designed to

be the last word in delity, musicality and dynamics. It will

effortlessly deliver large amounts of power while preserving

the delicate nuances in the music signal.

Bravo Audio Design

The signal path in the Bravo is fully balanced throughout the

voltage gain stages. This is essential to achieve the maximum

immunity from external sources of noise. Soft clipping

circuitry limits sonic degradation should the amplier be

overdriven. Bandwidth control results in nearly identical small

signal and large signal frequency responses and avoids slew

rate limiting. To ensure accuracy in the time domain, the

bandwidth control has a at group delay characteristic. Great

efforts have been made to minimize distortion at lower

frequencies, because the majority of energy is encountered at

these frequencies in most music. To improve transparency and

the resolution of low level signals, the output stage operates

with a relatively high quiescent current. Heavy oxygen free

copper bus bars enhance the efciency of power distribution

within the amplier. Film capacitors are used on the

individual circuit boards in the unit to provide the high

frequency bypass for the power supply and ensure that all

sections of the amplier see a uniformly low power supply

impedance. This is key to the Bravo’s ability to deliver

massive amounts of power while preserving all the subtle

aspects of the music signal.

Bravo Power Supply

The heart of a power amplier is its power supply. The Bravo

uses a choke input lter type power supply with a generously

rated 2kVA mains transformer. Four 80,000 μF lter capacitors

are located in the power amplier chassis, providing optimum

decoupling for the audio power stages.

The Bravo’s power supply design completely avoids the

generation of the high frequency noise that occurs with switch

mode power supplies. It also places less stress on the power

supply components, leading to higher reliability and longer

life. An additional benet is that high peak ripple currents are

virtually eliminated, minimizing intermodulation distortion on

the power supply rails and ground returns. This enhances

sound quality by reducing noise and distortion levels.

Viola Bravo Specications

Output Power Stereo Mode 350W per channel into 8 ohms

700W per channel into 4 ohms

Half-Bridge Parallel Mode 1,000W into 4 ohms

1,200W into 2 ohms

1,600W into 1 ohm

Full Bridge Mode 1,200W into 8 ohms

1,600W into 4 ohms

All power gures quoted are continuous average power

Inputs per channel 2 XLR

Outputs per channel 3 pairs of WBT terminals

Frequency Response 10Hz to 20kHz ± 0.15dB 10Hz to 100kHz,

-3dB

Power Bandwidth 5Hz to 100kHz

THD Less than 0.1% @ 20kHz and 350W

SN Ratio -105dB referenced to 350W, C weighted

Dimensions Amplier 44.7cm W x 23.5cm H x 66cm D

Power Supply 44.7cm W x 23.5cm H x 66cm D

Weights Amplier 39kg

Power Supply 57kg

REFERENCE POWER PREEAMPLIFIER

BRAVO II

1 2 3 4 5 6 7 8 9 10

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Viola Systems Spirito Reference Series Preamplifier Manual de usuario Pagina 3

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