Vitus SM-011 Monoaural Power Amplifier

The SM-011 is Vitus Audio's statement in monaural amplification — a pure Class A/AB monoblock that shares its chassis architecture with the SS-025 Mk.II and builds on the technical foundations of the SIA-025 to deliver more of everything: more silence, higher resolution, greater power, and dynamics that set a new standard at this level. In a world of compromise, the SM-011 is a declaration that none need be made.

Output Coupling Modes

The SM-011 introduces two distinct modes of output coupling, a development carried over from the reference MP-S201. This gives the SM-011 a degree of adaptability that is rare at any price point, allowing the amplifier to be optimised to the specific demands of the loudspeakers it is driving — whether that means maximum authority into a low-impedance load or the utmost delicacy with a sensitive, high-impedance design.

Power Supply and Topology

At the heart of each SM-011 is a 1.4kVA custom UI transformer engineered to less than 2% loss — a specification that reflects the uncompromising approach Vitus Audio bring to every stage of signal amplification. A 240,000µF capacitor bank stores sufficient energy to handle the most demanding transient passages without compression or hesitation. The circuit is fully balanced from input to output, and there is zero global negative feedback throughout — a topology that demands exceptional component matching and precision engineering, but delivers a transparency and immediacy that feedback-corrected designs cannot match.

Two Amplification Modes

The SM-011 operates in pure Class A up to 25W into 8Ω — sufficient for the vast majority of listening levels with sensitive loudspeakers — before transitioning seamlessly into Class AB, where it delivers 200W into 8Ω and 400W into 4Ω. This combination of Class A purity and Class AB authority gives the SM-011 an effortless quality in real-world listening that single-mode designs struggle to replicate. The SM-011 does not choose between refinement and power; it refuses to accept that a choice must be made.

Technical Specifications

Who Is It For?

The SM-011 is for the listener who has made peace with the idea that a truly great amplifier is a long-term relationship, not a stepping stone. It suits systems built around the finest preamplification — the Vitus SP-103 Phonostage or the Vitus SM-103 MK2 — and loudspeakers capable of resolving the extraordinary low-level detail it retrieves. Pair it with a source of equivalent ambition, such as the Vitus SD 025 MK2, and the SM-011 will reward you with a listening experience that justifies every penny.

Buying from Martins Hi-Fi

Martins Hi-Fi has been in Norwich since 1968. Elizabeth Gould runs the business today, and we stock only brands we have heard properly and stand behind. The SM-011 is available to audition at our Norwich showroom — speak to Dave or Chris, who know the Vitus range in depth and can guide you through the choice of finish, output mode, and system matching. We treat an amplifier at this level as the beginning of a conversation, not a transaction.

Contact us at info@martinshifi.co.uk, call 01603 627010, or WhatsApp on 07554 687137. You can read more about how we work on our Why Martins Hi-Fi page. We are at 85–91 Ber Street, Norwich, NR1 3EY.