Hi Sir Quack,
As Club Neon has pointed out, that's true. Further to my explanation to kcarlile, I'd add that an analog amplifier works in analogous fashion, regulating the output stage devices (transistors) to release power from the amplifier’s power supply to the loudspeakers in a manner that exactly mimics the tiny incoming audio waveform. So-called "Digital" amplifiers use high-frequency switching circuitry to modulate the output devices.
Here is an explanation of how the B&O "ICE" amplifiers work and how Axiom's A1400 differs in operation:
Denmark’s Bang & Olufsen (B&O) holds patents on its “ICE” amplifier, which is basically a Class D switching design (Pulse Width Modulator) with variants that B&O claims reduce distortion to levels associated with Class A amps, while retaining the high efficiency of Class D switching designs. ICE amps use a very high switching frequency of 384 kHz, which B&O says is 20 times as high as the highest frequency the ear can detect. The ICE amps also use feedback control to minimize the effects of the PWM design.
Axiom’s engineering division took a different approach in the A1400-8’s amplifier design. Axiom worked with International Rectifier to develop new silicon output devices that drive the MOSFETs in the output stage in such a way as to produce a perfect Pulse-Width Modulated square wave at the output before the reconstruction filter. This approach also simplifies the A1400-8's feedback network, which makes the amplifier more robust in its operation without being subject to oscillations or instability. The A1400-8 also uses a very high clock frequency to allow for excellent transient response and non-aliasing in the audio band. The massive power supply is able to accurately output very high current and voltage to the loudspeaker over extended time periods.
Alan
