PERHAPS THE MOST GORGEOUS PREAMP/ POWER AMP EVER MADE , THE VIOLA CRESCENDO/CONCERTO HAVE GARNERED LAVISH PRAISE FOR THEIR REMARKA BLE MUSICALITY AS WELL AS THEIR STUNNING APPEARANCE.
AS ROBERT HARLEY PUT ITIN HIS GLOWING REVIEW :
"The Viola pair was startling in its speed, transparency, and
resolution. Instruments and voices were right there, vivid and alive in
ways that rivaled any amplification I’ve heard. The treble, in
particular, had a realism and tangibility that were simply sensational.
This was the result of an extreme transparency and clarity that seemed
to strip away all sense of anything imposing itself between me and the
music. Listening to music through these electronics was like taking one
significant step closer to the original performance...
its rendition of transient information. These electronics are
lightning-fast—Spectral and Constellation fast— yet they have no
artificial etch that would impart a mechanical or sterile character to
the sound. The Viola reproduces transient sounds the way instruments do
in life, with sometimes startling attacks and quick decays. Some
electronics can sound fast through the treble, but exhibit a kind of
discontinuity because the midrange speed doesn’t match that of the top
end. The Viola electronics totally avoid this pitfall. In fact, they
exhibit a degree of transient coherence, from top to bottom, that is as
startling in its sonic achievement as it is in the musical result."
THE ABSOLUTE SOUND ,Apr 10th, 20.
The Crescendo chassis is milled from
a solid billet of aircraft grade Aluminum. This results in a very rigid
chassis with very low resonance. The Crescendo has a prism cut machine
finish and a custom Viola anodize finish.
Crescendo Audio Design
The OPA-1 module used in the Crescendo preamplifier is a discrete
Class A operational amplifier. The first stage employs a low noise FET
input. This is followed by a differential voltage gain section. The
output is a high current, low output impedance voltage follower which is
capable of driving the most demanding load. This results in a very
open, fast and transparent sound stage.
The Crescendo features a high resolution USB DAC input capable of
data streams up to 192 kHz/24 Bits. This allows connection from a
computer USB to stream music without the need to purchase additional
The Crescendo uses Wi-Fi remote control on Apple devices. This
eliminates the line of site problems associated with IR remote controls.
Crescendo Preamplifier Specifications
3 XLR balanced
3 RCA unbalanced
1 USB Audio
1 FIXED (Tape)
1 Million Ohms (Single Ended)
40k Ohms (Balanced)
Main Output 100 Ohms
Tape Output 600 Ohms
16dB, 26dB Switchable
7.3Vrms Single Ended
20Hz to 20kHz ± 0.2dB
Less than 0.005% @ 1V input
Less than 0.01% @ 20n kHz 1V input
> -90dBv 10Hz – 22 kHz
25.0 lbs. (11.3kg)
Concerto is a Class AB biased push-pull amplifier design. The Concerto
incorporates Motorola ThermalTrak™ into the bias network. This provides
fast thermal feedback information without the thermal lag of other bias
topologies. A center chassis Venturi style heat sink provides cooling
for the amplifier. Connections to loudspeakers are provided by a pair of
WBT nextgen™ connectors per channel.
The Concerto can be connected to the Crescendo preamplifier via the
CAN (Controller Area Network) connector. When this is done Concerto
status information including temperature and line voltage are
transmitted to the Wi-Fi remote application. This also provides
synchronization of the color displays and standby modes.
Concerto Power Amplifier Specifications
100W into 8 ohms
20Hz to 20kHz , THD < 0.2%
200W into 4 ohms
20Hz to 20kHz , THD < 0.2%
400W into 8 ohms
600W into 4 ohms
All power figures quoted are continuous average power
2 x XLR
1 pair of WBT nextgen terminals
10Hz to 20kHz ± 0.2dB at 1W into 8 ohms
5Hz to 100kHz, -3dB at 1W into 8 ohms
5Hz to 100kHz +0, -3dB
> -90dB @ 1kHz 100W, C weighted
17.5’’W x 3.5’’H x 15’’D
44.5cm W x 8.9cm H x 38.1cm D
53 lbs. (24kg)