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Integrated amplifiers — Vitus Audio SIA-025 MK.II
Description, images, technical data and specifications
Vitus Audio SIA-025 MK.II
Image source — © Vitus Audio
The SIA-025 MK.II is an integrated amplifier from Vitus Audio, built with substantial output and an exceptionally wide rated bandwidth. This model sits within Vitus Audio's integrated amplifier catalogue alongside the pricier SIA-030, offering the brand's characteristic Danish engineering ambition at a somewhat more accessible tier.
Position in line
It sits alongside the RI-101 MK.II and below the SIA-030 in Vitus Audio's integrated amplifier hierarchy. This positioning below the SIA-030 suggests the SIA-025 MK.II offers genuine access to Vitus Audio's engineering philosophy at a more attainable price than the brand's higher-output model.
Key specs that matter
Three balanced and two single-ended inputs are provided. Input sensitivity is 8000 mV, a notably high figure matching the SIA-030. Input impedance is 10,000 ohms for both connections. Output impedance is 33 ohms balanced. Output power is 150 W into 8 ohms, doubling to 300 W into 4 ohms - a clean doubling suggesting a robust power supply. Rated bandwidth is an extraordinary 0 Hz to 800 000 Hz, matching the SIA-030. Signal-to-noise exceeds 100 dB with distortion under 0.01%. At 135 x 435 x 436 mm and 37 kg it is an exceptionally heavy chassis for its output rating.
Sound and use context
Expect a controlled, wide-bandwidth presentation with the clean doubling into 4 ohms suggesting genuine current reserve - a capable performer reflecting Vitus Audio's characteristic Danish engineering ambition at a somewhat more accessible tier than the flagship SIA-030.
Pairing
The clean doubling into 4 ohms suits demanding or low-sensitivity loudspeakers without derating concerns, broadening the range of speakers this amplifier can comfortably serve.
Alternatives
Vitus Audio's SIA-030 sits above this model with more output; the RI-101 MK.II sits alongside it as a related design, worth comparing directly with a specialist dealer given the considerable investment either option within Vitus Audio's catalogue represents. Vitus Audio relatively specialist dealer network compared with more mainstream brands means arranging a proper demonstration is worth the extra research effort before committing to a purchase at this level. Given the exceptional 37 kg weight, a solid, well-supported equipment shelf is essential before installation. A dealer visit remains the simplest way to compare current pricing.
Position in line
It sits alongside the RI-101 MK.II and below the SIA-030 in Vitus Audio's integrated amplifier hierarchy. This positioning below the SIA-030 suggests the SIA-025 MK.II offers genuine access to Vitus Audio's engineering philosophy at a more attainable price than the brand's higher-output model.
Key specs that matter
Three balanced and two single-ended inputs are provided. Input sensitivity is 8000 mV, a notably high figure matching the SIA-030. Input impedance is 10,000 ohms for both connections. Output impedance is 33 ohms balanced. Output power is 150 W into 8 ohms, doubling to 300 W into 4 ohms - a clean doubling suggesting a robust power supply. Rated bandwidth is an extraordinary 0 Hz to 800 000 Hz, matching the SIA-030. Signal-to-noise exceeds 100 dB with distortion under 0.01%. At 135 x 435 x 436 mm and 37 kg it is an exceptionally heavy chassis for its output rating.
Sound and use context
Expect a controlled, wide-bandwidth presentation with the clean doubling into 4 ohms suggesting genuine current reserve - a capable performer reflecting Vitus Audio's characteristic Danish engineering ambition at a somewhat more accessible tier than the flagship SIA-030.
Pairing
The clean doubling into 4 ohms suits demanding or low-sensitivity loudspeakers without derating concerns, broadening the range of speakers this amplifier can comfortably serve.
Alternatives
Vitus Audio's SIA-030 sits above this model with more output; the RI-101 MK.II sits alongside it as a related design, worth comparing directly with a specialist dealer given the considerable investment either option within Vitus Audio's catalogue represents. Vitus Audio relatively specialist dealer network compared with more mainstream brands means arranging a proper demonstration is worth the extra research effort before committing to a purchase at this level. Given the exceptional 37 kg weight, a solid, well-supported equipment shelf is essential before installation. A dealer visit remains the simplest way to compare current pricing.
Specifications
Model name
SIA-025 MK.II
Type
Integrated Amplifier
Analog inputs (balanced)
3
Analog inputs (single-ended)
2
Input sensitivity (mV)
8000
Input impedance (balanced) (Ω)
10 000
Input impedance (single-ended) (Ω)
10 000
Output impedance (balanced) (Ω)
33
Output impedance (single-ended) (Ω)
N/A
D/A conversion
N/A
Phono MM/MC current-sensing input impedance (Ω)
N/A
Output power (8Ω) (W)
150
Output power (4Ω) (W)
300
Gain (dBu)
N/A
Frequency response low +/- 3dB (Hz)
N/A
Frequency response high +/- 3dB (Hz)
800 000
Signal to Noise Ratio (dB)
>100
Total Harmonic Distortion + Noise (%)
<0.01
Damping factor
N/A
Dimensions (mm)
135 × 435 × 436
Weight (kg)
37
Official link
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