Vitus SS-025 Stereo Power Amplifier

The SS-025 is Vitus Audio's Signature Series stereo power amplifier — a fully balanced design delivering 300W in Class AB and 8W in pure Class A into 8Ω, built on the same engineering disciplines that define the SM-011 and the wider Signature Series range. Drawing directly on technology developed for the SIA-025 and refined through the Masterpiece Series, the SS-025 sets a new standard for what a stereo power amplifier at this level can achieve — combining the tonal density and immediacy of Class A with the authority and dynamic headroom of Class AB in a single 37kg chassis of extraordinary ambition.

Class A and Class AB Operation

The SS-025 operates in pure Class A up to 8W into 8Ω — the threshold at which the vast majority of real-world listening takes place at normal levels — before transitioning seamlessly into Class AB, where it delivers 300W into 8Ω and 600W into 4Ω. This dual-mode topology, carried over from the SM-011 and refined through the Masterpiece Series, gives the SS-025 an effortless quality that single-mode designs cannot replicate. The transition between modes is inaudible in practice; what the listener experiences is simply an amplifier that never sounds strained.

Zero Global Negative Feedback

The SS-025 is designed with zero global negative feedback throughout the signal path — a topology that demands exceptional component matching and engineering discipline, but delivers a transparency and timing integrity that feedback-corrected designs cannot replicate. The result is an amplifier that does not merely reproduce recordings; it reveals them.

Bi-Amplification with the SIA-025 Mk.II

The SS-025 was conceived as the ideal partner for the Vitus SIA-025 Mk.II in a bi-amplification configuration. Used together, the two amplifiers form a beautifully synergised system — and when the Vitus SD 025 MK2 is added as a source, the result is a three-chassis combination of extraordinary coherence and musical authority built to last a lifetime.

Finish Options

The SS-025 is available as standard in Pure White, Jet Black, or Warm Silver. Titanium Orange, Dark Champagne, and Titanium Grey are among the most popular bespoke finish options. Speak to us about lead times for non-standard finishes.

Technical Specifications

Who Is It For?

The SS-025 is for the listener ready to commit to a reference-level stereo power amplifier that will anchor a system for decades. It is ideally matched with the Vitus SIA-025 Mk.II in a bi-amplification arrangement, or as a standalone power amplifier driven by a preamplifier of equivalent ambition. For those considering monoblock amplification, the Vitus SM-011 makes an illuminating comparison at our Norwich showroom. As a source, the Vitus SD 025 MK2 completes a system of unrivalled coherence.

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 SS-025 is available to hear at our Norwich showroom — speak to Dave or Chris, who can advise on system matching, finish selection, and the merits of bi-amplification with the SIA-025 Mk.II. A power amplifier at this level deserves a proper audition, and we will ensure you get one.

Contact us at [email protected], 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.