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We use a monolithic integrated circuit Class AB amplifier with wide voltage range and high current output capability. Operating in Parallel Mode with two devices ganged together to deliver higher output power into low impedance loads, allowing better thermal performance at high power. At low power, THD is a phenomenal 0.005%; at rated load it is 0.1%, yielding excellent performance at power compared to class D amps. The circuit uses a mixed bipolar MOS high voltage technology called BCDII 100/120 which avoids secondary breakdown phenomena. This technology handles high current output without unwieldy circuit complexity and external components. This makes it possible to deliver very high power in a reasonable package with the clean, smooth sound of a linear amplifier.
The system is being run at +/-40 VDC, yielding a rock solid 200WRMS at 1kHz into 8 ohms. Rather than use a switch mode power supply with the associated noise, we decided to stay traditional with a linear power supply. The power supply uses a massive old school toroidal transformer for the classic performance of an AB amplifier. Many companies use SMPS and Class D for this type of system. We made the decision to stay with classic technology in order to maintain the legacy sound that everybody associates with this design.