5
STEREO PREAMPLIFIER
CADENZA
The Viola Cadenza is a pure analog wide bandwidth
preamplier. It has six line inputs, plus one additional input
for an optional plug-in module. A high quality phono module
is in the nal stages of development and other modules are
under consideration. The Cadenza offers an extremely high
level of transparency, which is essential if the emotion that is
the essence of a musical performance is to be faithfully
reproduced.
Audio Design
All of the Cadenza’s amplication stages are fully balanced
and are constructed as modules using discrete components.
High precision (0.1%) thin lm resistors are used to
minimize noise. The modules plug into the motherboard,
which allows for easy upgrading should improved versions
become available in the future and also facilitates servicing.
The input section has been designed to have an input
impedance of one Mohm. This has three major benets:
• It preserves the balanced input’s ability to reject
interference if the output impedances of the signal
source are not perfectly matched.
• Errors are reduced at connector contact junctions.
• It conserves the source unit’s output drive current,
so that more output current is available to drive the
capacitance of the interconnecting cables, thus
improving the high frequency performance and
transient response.
Each channel has an 11 position stepped gain switch for
controlling channel balance. These switches can also be used
to “range” input sources with atypical output levels. They are
located in the inverse feedback loop for minimum noise. The
volume control is a custom made 59 position stepped
attenuator with 1dB steps. It uses 0.1% Vishay lm resistors
and the contact material is a high gold content alloy,
containing platinum, silver and copper. Careful design ensures
that external vibrations do not modulate the wiper contact
pressure, which would otherwise degrade the sound quality.
To prevent ground loops between signal ended source
units, all RCA inputs are completely isolated when not in use.
Heavy oxygen free copper bus bars enhance the efciency of
power distribution within the preamplier.
Viola Cadenza Specications
Inputs 1 Option Card
4 RCA
2 XLR
Outputs 1 RCA
2 XLR
1 RCA (Tape)
SSP Loop Yes
Frequency Response 20Hz to 20kHz ± 0.1dB
IMD Less than 0.005% @ 1V input
THD Less than 0.01% @ 20kHz 1v input
Noise -95dB
Dimensions Preamplier 44.7cm W x 9.1cm H x 40.6cm D
Power Supply 22.3cm W x 9.1cm H x 40.6cm D
Weights Preamplier 7.3kg
Power Supply 9.1kg
© Viola Audio Labs 2010
Low Noise Power Supply
The Cadenza uses a separate choke input lter type power
supply. This produces far less electromagnetic interference
than the capacitor input designs most often used. It also
places less stress on the power supply components, leading
to higher reliability and longer life. In addition, the Cadenza’s
power supply design completely avoids the high frequency
noise that occurs with switch mode power supplies. The
Cadenza’s power supply design also virtually eliminates high
peak ripple currents, minimizing intermodulation distortion
on the power supply rails and ground returns. This further
enhances the sound quality by reducing both noise and
distortion.
(14 paginas)
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