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Viola Labs

Viola Labs Crescendo

Regular price $22,500.00 USD
Regular price Sale price $22,500.00 USD
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The Viola Crescendo preamplifier is a single chassis stereo preamplifier. 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.


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.

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.


Inputs: Analog
3 XLR balanced
3 RCA unbalanced
Inputs: Digital
1 USB Audio
Outputs 1 RCA
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 16 dB, 26 dB Switchable
Maximum Output 14.6Vrms Balanced
7.3Vrms Single Ended
Maximum Output 14.6Vrms Balanced
7.3Vrms Single Ended
Frequence Response 20Hz to 20kHz ± 0.2dB
7.3Vrms Single Ended
IMD Less than 0.005% @ 1V input
THD Less than 0.01% @ 20n kHz 1V input
Noise < -90dBv 10Hz – 22kHz
Power Consumption Approximately 37W
Weight 25.0 lbs. (11.3kg)
Dimensions 17.5″ x 3.5″ H x 15″ D
44.5cm W x 8.9cm H x 38.1cm D