Viola Audio LabsConcerto Stereo usedFor sale is 1 Viola Audio Laboratories Concerto Stereo Power amplifier. Another unit has been sold. Unit is in almost new condition and perfect functionally.Description Housed in the same size ...10500.00

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Viola Audio Labs Concerto Stereo Amplifier [Expired]

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For sale is 1 Viola Audio Laboratories Concerto Stereo Power amplifier.  Another unit has been sold. 

Unit is in almost new condition and perfect functionally.


Housed in the same size billet Aluminum chassis as the Crescendo, the Concerto delivers 100W into 8 ohms and 200W into 4 ohms. Like all Viola power amplifiers the Concerto uses a choke input power supply. This reduces peak charging currents that are prevalent in capacitor input supplies. This minimizes intermodulation distortion on the power supply rails on ground returns.

Concerto Audio Design

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.


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

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


Will ship worldwide. Specialist in shipping overseas.

Unit is in 220-240 voltage @ 50/60Hz.

Buyer pays for actual shipping and insurance cost. Prefer wire transfer payment. Accept Paypal. Buyer is responsible for PayPal fees (add 5% to purchase price). Layaway payment method can be arranged.

I am a verified Audiogon dealer with outstanding feedback. Buy with confidence.

More pictures are available on request for serious buyer.

Thanks for looking.


member since June 2006

lw_415  Verified Dealer

Last 12 months
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