Profile: Viola Audio Labs, Inc. specializes in offering audio components and amplifiers. The Spirito™ preamplifier uses class A discrete circuitry and is fully balanced throughout. The input impedance of the input module is unusually high at 1Mohm. This avoids the loading that can be imposed on source equipment with conventional lower input impedance designs. The use of a fully balanced topology ensures the maximum rejection of common mode noise. This contributes to the stunning clarity and silent backgrounds. The ability of audio equipment to reject noise is an important consideration in the modern domestic environment. It uses a choke input filter type power supply. This produces far less electro-magnetic interference than the capacitor input designs most commonly used in pre-amplifiers. It also places less stress on the power supply components. Viola duet stereo electronic cross-over is a stereo electronic cross-over intended for use with speaker systems with up 2 bands.