STRUMENTO N°4 mk2 Stereo Power Amplifier

The Strumento N°4 mk2 Stereo Power Amplifier excels in response speed (1MHz+ bandwidth), high output power (up to 900 Watts), and supreme control over challenging speakers.

Drawing from our expertise in crafting the Strumento N° 8 Mono-block Power Amplifier, we've enriched the mk2 version.

We’ve refined the original Strumento N°4 circuit with a focus on achieving sonic perfection, much like a luthier perfecting an instrument’s tonal character and emotional response. The chassis of the Strumento N°4 mk2 is crafted from ultra-high-grade aluminum, meticulously finished and polished by hand for an exquisite result.

In the exquisite Strumento N° 4 mk2 casework, Italian craftsmanship and meticulous attention to detail shine.

Inside the Strumento N° 4 mk2 Stereo Power Amplifier, you’ll discover a fully balanced circuitry, premium components, a substantial power supply with high-grade capacitors, custom printed boards, and pure copper bars in the output stages. But that’s not all.

The power supply includes two high-current supplies per channel and four independent stages, achieving ultra-low noise with fast rectifiers and low impedance capacitors. It features toroidal audio transformers and no fuses in the output stage, ensuring exceptional sound quality.

Audia Flight's exclusive class A current-feedback circuitry powers the amplifier's gain stage.

The gain stage is isolated within an aluminum box and epoxy resin for thermal stability, while the output stage is powered by a 3000VA custom transformer enclosed in epoxy resin and ferromagnetic shields, and ultra-fast rectifiers replace fuses in the main power supply for the output stage, making the Strumento N°4 mk2 Stereo Power Amplifier a masterpiece of aesthetics and electronics.

Technical Data

  • Output power per channel Watts RMS @ 8/4/2 Ohm: 250/500/900W
  • Gain: 29 dB
  • Input sensitivity: 1.41 Volts RMS
  • Frequency response (1W RMS -3dB): 0,3 Hz ÷ 1 MHz
  • Slew-Rate (@ 8 Ohm): > 200 V/µS
  • THD: < 0,05 %
  • S/N Ratio: 110 dB
  • Input impedance Unbalanced: 7,5 kOhm
  • Balanced: 7,5 kOhm
  • Damping factor (@ 8 Ohm): > 1000
  • Main voltage AC (50-60Hz): 100, 110-115, 220-230, 240 V
  • Stand-by Power consumption: less than 1W
  • Nominal Power consumption (no signal): 400W
  • Power consumption (260W RMS @ 8ohm both channels driven): 1000W
  • Dimensions and weight: 450x280x500mm (W x H x D) - 95kg
  • Shipping dimensions and weight: 580x410x700mm (W x H x D) - 125kg
  • Output power per channel Watts RMS @ 8/4/2 Ohm: 250/500/900W
  • Gain: 29 dB
  • Input sensitivity: 1.41 Volts RMS
  • Frequency response (1W RMS -3dB): 0,3 Hz ÷ 1 MHz
  • Slew-Rate (@ 8 Ohm): > 200 V/µS
  • THD: < 0,05 %
  • S/N Ratio: 110 dB
  • Input impedance Unbalanced: 7,5 kOhm
  • Balanced: 7,5 kOhm
  • Damping factor (@ 8 Ohm): > 1000
  • Main voltage AC (50-60Hz): 100, 110-115, 220-230, 240 V
  • Stand-by Power consumption: less than 1W
  • Nominal Power consumption (no signal): 400W
  • Power consumption (260W RMS @ 8ohm both channels driven): 1000W
  • Dimensions and weight: 450x280x500mm (W x H x D) - 95kg
  • Shipping dimensions and weight: 580x410x700mm (W x H x D) - 125kg