Sigma MONO - Monoblock Power Amplifier

Power Amplifiers by CLASSE
Sigma MONO - Monoblock Power Amplifier
Sigma MONO - Monoblock Power Amplifier
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Sigma MONO - Monoblock Power Amplifier
Sigma MONO - Monoblock Power Amplifier


Sigma MONO - Monoblock Power Amplifier

  • Monoblack Class D power amplifier
  • 350 watts into 8Ω
  • Classé-designed switch mode power supply
  • Detailed and Powerful Sound
  • Compact Design

The Sigma MONO amplifier is the reference amplifier for a design group that began with the Delta series CA-D200 and extended to include the Sigma AMP2 and AMP5. These are proprietary Classé designs, not to be confused with the common approach of employing third-party modules. They are fully consistent with previous Classé designs sonically but offer notable virtues of their own. While the basic topology is the same across all four models, the Sigma MONO includes enhanced circuitry and offers additional power. The Sigma MONO amplifiers are designed to pack tremendous power (over 700W continuous into 4Ω loads) into a relatively small and energy efficient chassis, while pushing performance and value to the highest level.

Compared with the Sigma AMP2 and AMP5, the Sigma MONO utilizes even higher performance analog input circuitry, incorporates changes to the DSP to optimize performance for its higher output power, and includes upgrades to passive components in the power supply and output filters. Combined, these changes put the Sigma MONO amplifier’s performance a clear step ahead of the remarkable achievement introduced in the AMP2 and AMP5, making it a true reference amplifier design.

Grahams recommend you partner this amplifier with:

Please contact us to arrange a demonstration. 

Technical Specifications:

Frequency response

10Hz – 20kHz, -1dB into 4Ω

Output power

350W into 8Ω or 700W into 4Ω

Harmonic Distortion

<0.012% @ 1kHz driven to 1/8th power into 8Ω

Peak Output Voltage

151V peak to peak, 53.4V rms no load
151V peak to peak, 53.4V rms into 8Ω

Input Impedance

100kΩ Balanced / 50kΩ SE

Voltage Gain

29 dB

Signal to Noise Ratio

-100 dB at peak output into 8Ω (AES17)

Rated power

130W @ 1/8th power into 4Ω

Mains voltage

90V - 264V, 50/60Hz

Overall Dimensions

Width: 17.00" (433mm)
Depth (excluding connectors): 14.57" (370mm)
Height: 3.75" (95mm)

Net weight

22.0 lb (10.00 kg)