Photo: Randi Klett
Years ago I decided to see how little I needed to spend to build a high-end, audiophile quality, class-D amplifier. The answer, then, was US $523.43. I built a worthy little amp, and the article I wrote about it for IEEE Spectrum still attracts page views, and even sporadic emails from people asking where they can get the parts.
Sorry folks, the main components are long gone. So I’ve been steering people to excellent class-D amplifier kits from Class D Audio, DIY Class D, and Ghent Audio instead. But a couple of months ago I got the itch to see how much better I could do now, almost a decade later, with the same challenge. Part of my motivation was the annual Best Stereo Amps lists from gadget-review website The Master Switch. The lists are dominated by amps costing more than $1,000 (nine of them cost
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