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<blockquote data-quote="thisisausername" data-source="post: 8221266" data-attributes="member: 565137">I think my rant was a little nonsensical because I was quite drunk at the time. My main point was that amplifiers are more expensive to design and build for 120V AC mains than they are for 12v DC . Power Factor Correctors (PFC&#039;s) must be used with high power AC amplifiers because otherwise you will distort the sine wave in the power circuit and perhaps the entire building with what looks like clipping. 12V car stuff doesn&#039;t need any of that because its already DC.Also, most amplifiers for Professional Audio are Class-D and full range (up to 20khz). Until recently Class-D amps were mostly for subwoofer use in car audio. Building full range Class-D amps is harder and more expensive. The switching frequency must be high enough that harmonics will not affect audio quality at higher frequencies. This requires a switching speed of 100+khz which was hard to do until recently. You are right that mosfet amps have been around for a long time, but regular mosfet amps are Class A/B which is only ~45% efficient at converting power input to audio output.</blockquote>

[QUOTE="thisisausername, post: 8221266, member: 565137"] I think my rant was a little nonsensical because I was quite drunk at the time. My main point was that amplifiers are more expensive to design and build for 120V AC mains than they are for 12v DC . Power Factor Correctors (PFC's) must be used with high power AC amplifiers because otherwise you will distort the sine wave in the power circuit and perhaps the entire building with what looks like clipping. 12V car stuff doesn't need any of that because its already DC. Also, most amplifiers for Professional Audio are Class-D and full range (up to 20khz). Until recently Class-D amps were mostly for subwoofer use in car audio. Building full range Class-D amps is harder and more expensive. The switching frequency must be high enough that harmonics will not affect audio quality at higher frequencies. This requires a switching speed of 100+khz which was hard to do until recently. You are right that mosfet amps have been around for a long time, but regular mosfet amps are Class A/B which is only ~45% efficient at converting power input to audio output. [/QUOTE]

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