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NAD Electronics

NAD focuses on the concept of "effective power" and its amplifiers deliver generous headroom, meaning that they may be able to deliver dynamic power bursts far in excess of their rated RMS power.[8] The key to this feature requires use of a flexible power supply which stores significant reserve current for quick release at moments of high musical load

Additional benefits of this approach include the fact that amplifiers using this technology can handle complex, real-life, lower-impedance loudspeaker loads as compared with the simple 8-ohm resistor typically used to calculate advertised power ratings and the fact that the circuitry in this approach requires less cooling, while maintaining ability to handle complex impedance loads as low as 2 ohms.