Modern digital amplifiers can be very good. That's especially true of HVIC based units like the two I built. HVICs have the MOSFETs and MOSFET drivers (and in some, even more like the Delta Sigma stages) on one piece of silicon, meaning the least possible parasitics and the capability for very high carrier frequencies. But all too many units sold for home theater use use the older IPMs (MOSFETs and driver are separate pieces of silicon in one package) or even through hole discrete MOSFETs.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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