A1.5 Two-channel Power Amplifier
Highlights

Physical And Conceptual Modularity

• Modular input boards to match system topology (one or two inputs as required)
• Output stage can deliver 2x 150W RMS into 8 Ohms stereo, 150W into 8 Ohms mono (high-current), 550W mono (bridged) or 2x 150W bi-amped (single input, differential channel gain and global feedback settings)

Analog Input Stage

• Pure class A, fully symmetrical circuit topology
• Fully discrete, ultra low noise, high slew rate design
• DC coupled with no series capacitors in the audio signal path
• Gain adjustable through 24dB in 0.5dB steps

Analog Output Stage

• Pure class A ultra low noise driver and class AB pure follower power stage
• ExactBias circuitry ensures constant bias, independent of room temperature and amplifier loading
• Constant monitoring of output power and temperature
• User configurable display will show amplifier status, power output etc
• Customized Argento loudspeaker binding posts, accept spades and banana connectors

Power Supply

• 1700VA power transformer mounted on separate, mechanically isolated chassis bed to eliminate mechanical vibration
• Magnetically and electrostatically shielded transformers to reduce noise and EM interference
• Hyper fast, soft recovery diode bridge rectifiers meet dynamic demands without strain
• Twin 82,000uF custom-built, ultra low ESR reservoir and filtering capacitors

User Adjustable Global Feedback

• Ratio of Global to Local Feedback can be adjusted from 0% to 100%, in six steps (0, 10, 20, 40, 70, 100%) via the user interface or control app
• Allows user optimization of amplifier/speaker interface, especially lowfrequency damping relative to speaker/room interaction
• Each channel can be adjusted individually to control specific drivers/ranges in bi-amplification modes

Light Touch Protection

• No output relay in signal path; full short circuit protection
• Non-invasive output stage voltage, current and temperature monitoring protects your amplifier – and your speakers