These are from Etsy seller ikymagoo, who also has red and yellow versions. They seem pricey to me at $200 a set, but they also seems like an easy re-make. There’s video here showing more detail, including the binding posts on the back. Some info on a similar build, also by ikymagoo, is available in this thread at the DIY Audio Projects Forum.
I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and makezine.com. My work has also appeared in ReadyMade, c't โ Magazin fรผr Computertechnik, and The Wall Street Journal.
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