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Power amplifiers mono — Vitus Audio SM-103 MK.II
Description, images, technical data and specifications
Vitus Audio SM-103 MK.II
Image source — © Vitus Audio
The SM-103 MK.II is a monoblock power amplifier from Vitus Audio, sitting below the SM-011 and SM-025 with more modest output power in a considerably heavier chassis. The SM-103 MK.II brings Vitus's uncompromising Danish engineering to serious monoblock power amplification.
Key specs that matter
Input sensitivity is 2,000mV, with input impedance at 10,000 ohms on both connections. Output impedance is a remarkably low 0.075 ohms single-ended. Output power is 100W into 8 ohms, rising to 200W into 4 ohms - more modest than the SM-011's 200W/400W. Frequency response extends up to an exceptionally wide 800,000Hz within plus-or-minus 3dB. Signal-to-noise ratio exceeds 100dB, with total harmonic distortion plus noise under 0.01% at 100% global feedback. At 310 x 435 x 601mm and a staggering 75kg, the SM-103 MK.II's considerable weight for its more modest power output reflects serious internal transformer engineering, likely operating in Class A.
Sound and use context
Expect exceptionally clean, tightly controlled amplification reflecting the remarkably low output impedance, with the staggering 75kg mass relative to modest power output suggesting serious Class A biasing and sonic character prioritisation.
Pairing
As a monoblock, two units are needed for a stereo pair, and the modest power output pairs best with notably efficient loudspeakers.
Alternatives
Vitus's own MP-M201 MK.II offers a considerably more powerful alternative within the same broader monoblock catalogue.
Key specs that matter
Input sensitivity is 2,000mV, with input impedance at 10,000 ohms on both connections. Output impedance is a remarkably low 0.075 ohms single-ended. Output power is 100W into 8 ohms, rising to 200W into 4 ohms - more modest than the SM-011's 200W/400W. Frequency response extends up to an exceptionally wide 800,000Hz within plus-or-minus 3dB. Signal-to-noise ratio exceeds 100dB, with total harmonic distortion plus noise under 0.01% at 100% global feedback. At 310 x 435 x 601mm and a staggering 75kg, the SM-103 MK.II's considerable weight for its more modest power output reflects serious internal transformer engineering, likely operating in Class A.
Sound and use context
Expect exceptionally clean, tightly controlled amplification reflecting the remarkably low output impedance, with the staggering 75kg mass relative to modest power output suggesting serious Class A biasing and sonic character prioritisation.
Pairing
As a monoblock, two units are needed for a stereo pair, and the modest power output pairs best with notably efficient loudspeakers.
Alternatives
Vitus's own MP-M201 MK.II offers a considerably more powerful alternative within the same broader monoblock catalogue.
Specifications
Model name
SM-103 MK.II
Input sensitivity (mV)
2000
Input impedance (balanced) (Ω)
10 000
Input impedance (single-ended) (Ω)
10 000
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
0.075
Max current (A)
N/A
Output power (8Ω) (W)
100
Output power (4Ω) (W)
200
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% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
<0.01
Max power consumption (W)
N/A
Damping factor
N/A
Dimensions (mm)
310 × 435 × 601
Weight (kg)
75
Official link
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