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<blockquote data-quote="helotaxi" data-source="post: 3419512" data-attributes="member: 550915">Most A/B amps use a pulse width modulated power supply.&nbsp; Class A/B and Class D refer to the output topology, not the power supply.&nbsp; Class A/B uses a linear(ish) push-pull transistor arrangement where the output device will vary from fully on to fully off and all the range in between.&nbsp; A Class D is a switchmode amp where the output devices are either fully on or fully off but never in between.&nbsp; The Switching of the outputs when filtered through an inductor creates a very good approximation of signal.&nbsp; The linearity and efficiency of the amp is based on the switching freq as you somewhat get.&nbsp; There is a tradeoff in efficiency to get better linearity.&nbsp; For a full range Class D linearity is more important and some efficiency is sacrificed.&nbsp; For limited bandwidth dedicated sub amps, efficiency is more important and linearity suffers a small bit; however, because of the nature of the filters used, the effect of a low switching speed on the linearity of the amp is very small at low frequencies.Based on your statement above it is quite apparent that you don&#039;t fully understand how a Class D amp operates and your conclusion about the relative sound quality capabilities of the different amplifier classes is based on uneducated speculation rather than educated reason.&nbsp; Digital audio uses a switching algorithm to convert analog sound into a digital data stream.&nbsp; It is generally not considered to have a negative effect on the quality of the sound.&nbsp; Why then would a properly designed switching amp?</blockquote>

[QUOTE="helotaxi, post: 3419512, member: 550915"] Most A/B amps use a pulse width modulated power supply. Class A/B and Class D refer to the output topology, not the power supply. Class A/B uses a linear(ish) push-pull transistor arrangement where the output device will vary from fully on to fully off and all the range in between. A Class D is a switchmode amp where the output devices are either fully on or fully off but never in between. The Switching of the outputs when filtered through an inductor creates a very good approximation of signal. The linearity and efficiency of the amp is based on the switching freq as you somewhat get. There is a tradeoff in efficiency to get better linearity. For a full range Class D linearity is more important and some efficiency is sacrificed. For limited bandwidth dedicated sub amps, efficiency is more important and linearity suffers a small bit; however, because of the nature of the filters used, the effect of a low switching speed on the linearity of the amp is very small at low frequencies. Based on your statement above it is quite apparent that you don't fully understand how a Class D amp operates and your conclusion about the relative sound quality capabilities of the different amplifier classes is based on uneducated speculation rather than educated reason. Digital audio uses a switching algorithm to convert analog sound into a digital data stream. It is generally not considered to have a negative effect on the quality of the sound. Why then would a properly designed switching amp? [/QUOTE]

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