Viola Labs
Viola Labs Crescendo
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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.
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.
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.
Specification
| Inputs: |
Analog 3 XLR balanced 3 RCA unbalanced |
| Inputs: |
Digital 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 | 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 |
