Audio engineer and YouTuber Denki Otaku purchased an ultra-cheap XLR ground loop isolator—a device designed to eliminate buzzing caused by conflicting electrical grounds—from a Japanese e-commerce site. Upon inspection, the device proved non-functional, sparking an in-depth investigation into how these isolators actually work. The resulting deep dive is both a cautionary tale about bargain-basement audio gear and an unexpectedly practical electronics education.

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