The Orpheus Lab H Three M800 Opus II is a reference-level monoblock power amplifier designed and manufactured in Switzerland. Part of the company’s Heritage Opus II range, it incorporates a sophisticated Class AB architecture delivering 400 watts into 8 ohms and 800 watts into 4 ohms. Its high-current output stage employs 24 individually matched power MOSFETs, each governed by bipolar transistor control circuitry and a proprietary multi-point feedback topology. This carefully engineered arrangement provides precise control of the output devices, with instantaneous current delivery reaching 45 amperes and a damping factor of 1,100, allowing the amplifier to maintain authority over demanding loudspeaker loads.
The H Three M800 Opus II is supported by a substantial 2,400VA toroidal power supply and 350,000µF of reservoir capacitance, providing the energy reserves required for demanding musical transients. A proprietary temperature-compensated bias regulation circuit maintains stable Class AB operating conditions, while the carefully calibrated 480mA bias current supports consistent output-stage performance. Balanced XLR and unbalanced RCA inputs provide flexibility when partnering the amplifier with different preamplifiers, while comprehensive protection circuitry safeguards against excessive current, unwanted DC and mains interruptions. Combining substantial power delivery, exceptionally low distortion and carefully controlled output-stage operation, the H Three M800 Opus II provides a formidable amplification solution for the most ambitious high-performance audio systems.
Key Features
Reference-level Class AB monoblock power amplifier
Designed and manufactured in Switzerland
Part of the Orpheus Lab Heritage Opus II range
Dedicated single-channel amplification architecture
Rated output power: 400 watts RMS into 8 ohms
Rated output power: 800 watts RMS into 4 ohms
24 individually matched high-power MOSFET output devices
Bipolar transistor control circuitry governing each MOSFET
Proprietary multi-point feedback topology
High-current output stage capable of 45A instantaneous current peaks
Continuous peak power specification: 2,200W peak
Instantaneous peak power: 3,600W for durations below 200ms
Maximum instantaneous output voltage: 80.8V peak
Proprietary temperature-compensated bias regulation
Carefully calibrated 480mA Class AB bias current
Low-impedance BJT bias regulation circuitry
Bias regulation designed to maintain stable operating conditions across changes in temperature and load
Thermal idle dissipation: 96W per amplifier
Substantial 2,400VA toroidal power supply
Total reservoir capacitance: 350,000µF
Power supply decoupling designed to reduce mains-related interference
Balanced XLR analogue input
Unbalanced RCA analogue input
Selectable signal grounding for the unbalanced input
Grounded and lifted signal-ground configurations
Low output impedance of 0.0072 ohms
Damping factor of 1,100 into 8 ohms
Wide-bandwidth amplifier architecture
Frequency response extending to 165kHz at -3dB
THD+N of 0.0018% at 800W into 4 ohms
Balanced-input dynamic range exceeding 123dB
Unbalanced-input dynamic range exceeding 123dB
Protection against unwanted DC components at the loudspeaker output
Output voltage monitoring for excessive low-frequency input signals
Output current limiting at ±45A peak
Overcurrent protection for sustained current demands
Automatic muting during mains voltage interruption
Standby power consumption below 1W
Substantial 56kg chassis construction
The Orpheus Lab H Three M800 Opus II is a reference-level monoblock power amplifier designed and manufactured in Switzerland. Part of the company’s Heritage Opus II range, it incorporates a sophisticated Class AB architecture delivering 400 watts into 8 ohms and 800 watts into 4 ohms. Its high-current output stage employs 24 individually matched power MOSFETs, each governed by bipolar transistor control circuitry and a proprietary multi-point feedback topology. This carefully engineered arrangement provides precise control of the output devices, with instantaneous current delivery reaching 45 amperes and a damping factor of 1,100, allowing the amplifier to maintain authority over demanding loudspeaker loads.
The H Three M800 Opus II is supported by a substantial 2,400VA toroidal power supply and 350,000µF of reservoir capacitance, providing the energy reserves required for demanding musical transients. A proprietary temperature-compensated bias regulation circuit maintains stable Class AB operating conditions, while the carefully calibrated 480mA bias current supports consistent output-stage performance. Balanced XLR and unbalanced RCA inputs provide flexibility when partnering the amplifier with different preamplifiers, while comprehensive protection circuitry safeguards against excessive current, unwanted DC and mains interruptions. Combining substantial power delivery, exceptionally low distortion and carefully controlled output-stage operation, the H Three M800 Opus II provides a formidable amplification solution for the most ambitious high-performance audio systems.
Key Features
Reference-level Class AB monoblock power amplifier
Designed and manufactured in Switzerland
Part of the Orpheus Lab Heritage Opus II range
Dedicated single-channel amplification architecture
Rated output power: 400 watts RMS into 8 ohms
Rated output power: 800 watts RMS into 4 ohms
24 individually matched high-power MOSFET output devices
Bipolar transistor control circuitry governing each MOSFET
Proprietary multi-point feedback topology
High-current output stage capable of 45A instantaneous current peaks
Continuous peak power specification: 2,200W peak
Instantaneous peak power: 3,600W for durations below 200ms
Maximum instantaneous output voltage: 80.8V peak
Proprietary temperature-compensated bias regulation
Carefully calibrated 480mA Class AB bias current
Low-impedance BJT bias regulation circuitry
Bias regulation designed to maintain stable operating conditions across changes in temperature and load
Thermal idle dissipation: 96W per amplifier
Substantial 2,400VA toroidal power supply
Total reservoir capacitance: 350,000µF
Power supply decoupling designed to reduce mains-related interference
Balanced XLR analogue input
Unbalanced RCA analogue input
Selectable signal grounding for the unbalanced input
Grounded and lifted signal-ground configurations
Low output impedance of 0.0072 ohms
Damping factor of 1,100 into 8 ohms
Wide-bandwidth amplifier architecture
Frequency response extending to 165kHz at -3dB
THD+N of 0.0018% at 800W into 4 ohms
Balanced-input dynamic range exceeding 123dB
Unbalanced-input dynamic range exceeding 123dB
Protection against unwanted DC components at the loudspeaker output
Output voltage monitoring for excessive low-frequency input signals
Output current limiting at ±45A peak
Overcurrent protection for sustained current demands
Automatic muting during mains voltage interruption
Standby power consumption below 1W
Substantial 56kg chassis construction
