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Vitus SIA-025 MK II Integrated Amplifier

Vitus SIA-025 MK II Integrated Amplifier


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01603 627010

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Vitus SIA-025 MK II Integrated Amplifier

When we undertook the design and construction of the SIA-025 Mk.II, we knew that the task would be a formidable one if we were to preserve or even exceed the quality for which we are famous.

At its core was combining fully integrated circuitry in the same chassis as our legacy product, the SS-010, with no sacrifice in terms of size or noise. The technologies that this required already existed but had to be refined and optimised for their new roles.

Despite the inherent challenges, our design team refused to compromise upon the renowned Vitus Audio principles including the rule that no component is required to deliver more than 25% of that which it is capable of handling. This dramatically increases component longevity.

The result of our design team’s efforts has been a technical and critical triumph – an amplifier with five inputs (balanced and unbalanced), a preamplifier output (for bi-amping purposes), balanced speaker outputs, and a full bypass function offering compatibility with external surround processors.

The balanced, fully integrated SIA-025 Mk.II performs to the standards our customers rightly expect from our Signature Series. It provides an aesthetically elegant system that delivers an incredible performance.

The SIA-025 Mk.II comes in Pure White, Jet Black or Warm Silver as standard. Titanium Orange, Dark Champagne and Titanium Grey are our most popular unique finishes.

Available       3 (L+R)                            2 (L+R)
Sensitivity     2/4/8 VRMS                    2/4/8 VRMS
Impedance   10KΩ                               10KΩ

OUTPUT (EACH CH.)                         SPEAKER                       PRE OUT
Available                                              1                                    1 (XLR)
Impedance                                           0.075Ω                          33Ω
Power WRMS (8Ω)                               ~25W Class A /             ~150W Class AB
Power WRMS (4Ω)                               ~50W Class A /             ~300W Class AB                 
Frequency response                            +800kHz
Signal to noise ratio                            >100dB @ 1kHz
THD + noise                                        <0.01%


  • Type Relay controlled fixed resistor network
  • Steps -81dB to +11dB in 1dB steps


  • Standby <1W
  • Class AB 90W
  • Class A 162W


  • Height 135mm including feet
  • Width 435mm
  • Depth 436mm / 471mm with binding posts
  • Weight 37kg
  • Material Aluminium for body parts and heat sinks