Усилители мощности моно — Vitus Audio MP-M201 MK.II

The MP-M201 Mk.II is a monoblock amplifier belonging to the Masterpiece line made by Vitus Audio of Denmark. Its maker states that it took nine years of research and development and describes it as a four chassis system weighing 300 kg in total for a stereo setup. The amplifier is built specifically for bi-amping complex loudspeakers, and Vitus positions it as an answer to issues such as external active crossovers and dedicated bass amplification in such systems. The American list price for two units is USD 236,250, and buyers can choose from standard and custom colour finishes.

Key specs that matter

Each unit has one XLR analogue input with a sensitivity of 2 V RMS and an impedance of 10 kohm. There are two speaker outputs per unit - one for high frequencies and one for low frequencies. Into an 8 ohm load the treble section is rated at 100 W RMS in Class A or 300 W RMS in Class AB, while the bass section provides 500 W RMS, also in Class AB. Output impedance is 0.075 ohm, bandwidth goes past 800 kHz, noise is more than 130 dB down and THD plus noise remains below 0.01%. The amplifier chassis measures 270 mm high, 435 mm wide and 610 mm deep.

Engineering and use context

To keep noise away from the amplifier circuits, Vitus placed the power supply together with all logic and CPU control in a separate chassis, so each channel consists of an amplifier box and a supply box. The link between them uses custom cables made by the Virginia Panel Corporation to avoid limits on peak current between supply and amplifier. The circuit is fully balanced, runs without global feedback and uses a discrete topology in which one input stage feeds the two output stages. Because the high and low sections are separate, one unit can drive the treble and bass parts of a bi-wirable loudspeaker directly.

Pairing

Speakers with separate bass and treble terminals get the most from the design, since each unit drives both sections of one speaker, and a complete stereo installation uses two amplifier boxes and two supply boxes. Since only a balanced input is fitted, the source ahead of it needs XLR outputs - one example is the MP-L201 Mk.II line stage from the same Masterpiece family. For a disc based source that range also includes the MP-T201 Mk.II CD transport, and the MP-P201 phono stage covers vinyl.

Alternatives

The Vitus SM-025 from the Signature Series is a Class A and AB mono amplifier built as separate monoblocks.