Vitus SIA-025 MK II Integrated Amplifier

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Vitus SIA-025 MK II Integrated Amplifier The SIA-025 Mk.II is Vitus Audio's Signature Series integrated amplifier — a single-chassis design of extraordinary ambition that combines the preamplifier topology of the SS-010 with fully integrated amplification, and that demonstrates with complete conviction that Signature Series engineering principles can be achieved within one chassis without concession of any kind. The SIA-025 Mk.II delivers approximately 25W per channel in pure Class A into 8Ω — covering the vast majority of real-world listening levels with any loudspeaker of reasonable sensitivity — before transitioning seamlessly into Class AB, delivering approximately 150W per channel into 8Ω and approximately 300W per channel into 4Ω. This combination of Class A intimacy and Class AB authority defines the SIA-025 Mk.II as one of the most complete integrated amplifiers available at any price. The 25% Rule Every component within the SIA-025 Mk.II operates at no more than 25% of its rated capability under normal conditions — a Vitus Audio engineering discipline applied without exception across every Signature and Masterpiece Series product. The result is an amplifier of extraordinary longevity and consistency, one that eliminates thermal stress, reduces long-term component degradation, and ensures every element of the circuit operates in its most linear and musically accurate region at all times. Fully Balanced Architecture The SIA-025 Mk.II is fully balanced throughout — three XLR balanced inputs and two RCA single-ended inputs, balanced speaker outputs, and a preamplifier output via XLR for bi-amplification with a dedicated power amplifier such as the Vitus SS-025. Signal-to-noise ratio exceeds 100dB, rendering the noise floor effectively inaudible and allowing low-level detail to emerge with a precision and naturalness that single-ended designs cannot replicate. Full Bypass Function The SIA-025 Mk.II incorporates a full bypass function for complete compatibility with external surround processors — allowing it to serve as the high-quality stereo amplification foundation of a wider AV installation while retaining its full two-channel musical authority without compromise. Relay-Controlled Volume Volume is controlled via a relay-controlled fixed resistor network, operating across -81dB to +11dB in precise 1dB steps — eliminating the tracking errors and channel imbalance of conventional potentiometers, and preserving the SIA-025 Mk.II's extraordinary low-level resolution at every point on the volume range. Technical Specifications Parameter Specification Balanced inputs 3 × XLR Single-ended inputs 2 × RCA Input sensitivity 2 / 4 / 8 VRMS Input impedance 10kΩ Preamplifier output 1 × XLR Output impedance (speaker) 0.075Ω Output impedance (pre out) 33Ω Power — Class A (8Ω) ~25W per channel Power — Class AB (8Ω) ~150W per channel Power — Class A (4Ω) ~50W per channel Power — Class AB (4Ω) ~300W per channel Frequency response +800kHz Signal to noise ratio >100dB @ 1kHz THD + noise Show more