Our fave?
No. 11 Class-D Audio: The Power and the Glory...
"...class-D amps are making steady inroads in the home market, where they can exploit to full advantage modern components that are cheap but have very high performance: MOSFETs just keep getting better and better and cheaper and cheaper. And for the technically inclined, amplifier modules and kits allow anyone with modest soldering skills to get class-D sound, highly precise and detailed, for a few hundred dollars. One of our favorite kits is the SDS-224 kit from Class D Audio, with its robust power supply." -- IEEE Spectrum
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