Viola Audio Labs Crescendo/Concerto Stunning appearance surpassed only by their sound quality.

LESS THAN 1/2 RETAIL PRICE!

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.

Features

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 hardware.

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

Inputs: Analog

Digital 3 XLR balanced
3 RCA unbalanced
1 USB Audio
1 SPDIF Outputs 1 RCA
1 XLR
1 FIXED (Tape) Input Impedance 1 Million Ohms (Single Ended)
40k Ohms (Balanced) Output Impedance Main Output 100 Ohms
Tape Output 600 Ohms Maximum Gain 16dB, 26dB Switchable Maximum Output 14.6Vrms Balanced
7.3Vrms Single Ended Frequency Response 20Hz to 20kHz ± 0.2dB IMD Less than 0.005% @ 1V input THD Less than 0.01% @ 20n kHz 1V input Noise > -90dBv 10Hz – 22 kHz Power Consumption Approximately 37W Weight 25.0 lbs. (11.3kg)

CONCERTO

The 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.

Network

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

Output Power Stereo Mode
  100W into 8 ohms
  20Hz to 20kHz , THD < 0.2%
  200W into 4 ohms
  20Hz to 20kHz , THD < 0.2%
Bridge Mode
  400W into 8 ohms
  600W into 4 ohms All power figures quoted are continuous average power Inputs 2 x XLR Outputs 1 pair of WBT nextgen  terminals Frequency Response 10Hz to 20kHz ± 0.2dB at 1W into 8 ohms
5Hz to 100kHz, -3dB at 1W into 8 ohms Power Bandwidth 5Hz to 100kHz +0, -3dB SN Ratio > -90dB @ 1kHz 100W, C weighted Dimensions 17.5’’W x 3.5’’H x 15’’D
44.5cm W x 8.9cm H x 38.1cm D Weight 53 lbs. (24kg)