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Class XD (crossover displacement) is a proprietary and patented [1] amplifier technology developed in-house by Cambridge Audio.. First appearing in 2006 in the Azur 840A integrated amplifier, the Crossover Displacement design sought to combine the performance of a traditional Class A design with the efficiency of Class B but without the linearity and distortion limitations of Class AB.
There are a variety of amplifier designs that enhance class-AB output stages with more efficient techniques to achieve greater efficiency with low distortion. These designs are common in large audio amplifiers since the heatsinks and power transformers would be prohibitively large (and costly) without the efficiency increases. The terms "class ...
In most amplifiers a reduction in gain takes place before hard clipping occurs; the result is a compression effect, which (if the amplifier is an audio amplifier) sounds much less unpleasant to the ear. For these amplifiers, the 1 dB compression point is defined as the input power (or output power) where the gain is 1 dB less than the small ...
The 5532 attains lowest total harmonic distortion (THD) in an inverting (shunt-feedback) configuration with moderate gain and moderate signal levels, where the THD does not exceed 0.0005% throughout the audio frequency spectrum. [16] High source impedances inject added thermal noise, but do not affect the THD of the inverting amplifier. [17]
Designers of purely solid-state class AB amplifiers with global negative feedback claimed closed-loop THD of no more than 0.003% throughout the audio range. [16] Lowest distortion buffer amplifiers employ a combination of a voltage operational amplifier and an off-the-shelf diamond buffer IC, enclosed in a common negative feedback loop. [12]
Naim says that to achieve amplifiers with low harmonic distortion, low noise, wide power-bandwidth, and constant dynamic output impedance, they pay attention to balancing dynamic impedance, open-loop bandwidth, slew rate, and propagation delay; the amplifiers are not subject to slew-rate limitation between 5 Hz and 50 kHz. [13]
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