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Message: <blockquote data-quote="helotaxi" data-source="post: 4849516" data-attributes="member: 550915"><p>The new Arc amps aren't even Class D.  They're Class G or H, I can't remember which.  TOuput stage is Class A or A/B but the power supply varies the rail voltage so there is minimal voltage drop across the output devices and thus very little wasted power.  The result is that it is actually a linear amp, which switching amps aren't, with the efficiency of a switchmode amp.  The greatly increased efficiency means that there is little need for a heatsink because it just doesn't get hot.  Same topology that the old Blade Audio SE series amps used in the early 90's if you remember those.  They were able to fit a pretty powerful amp in a tiny foot print.  They WERE expensive though.  Probably why they didn't last as a company.  Just couldn't move enough of them.</p></blockquote><p></p>

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