Power amplifiers mono — Vitus Audio SM-025

The SM-025 is a Class AB monoblock power amplifier from Vitus Audio, sharing the SM-011's output power specification with a somewhat more conventional bandwidth. The SM-025 brings Vitus's considered 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 power is 200W into 8 ohms in Class AB operation, rising to 400W into 4 ohms, matching the SM-011. Frequency response spans 5Hz to 100,000Hz within plus-or-minus 3dB - a more conventional range than the SM-011's extreme 800kHz figure. Signal-to-noise ratio exceeds 110dB, with total harmonic distortion plus noise under 0.01% at 100% global feedback. At 177 x 435 x 436mm and 38kg, the SM-025 shares a similar footprint to the SM-011 with a modest increase in depth and mass.

Sound and use context

Expect exceptionally clean, controlled Class AB amplification reflecting the strong over-110dB signal-to-noise figure, consistent with Vitus's broader uncompromising engineering philosophy.

Pairing

As a monoblock, two units are needed for a stereo pair, and the substantial 400W-into-4-ohms output handles demanding loudspeaker loads.

Alternatives

Vitus's own SM-011 offers a related model with an even wider bandwidth specification within the same broader monoblock catalogue.