“Cleaning” USB is not needed for a well-designed and built DAC. Here are some DACs I own or owned that do not need any such “cleaning,” from personal experience: Holo Spring 2 KTE, Holo May KTE, any Schiit Yggdrasil with Unison, Soekris dac1541/2541. In the current state of technology, there’s absolutely no reason (except incompetence or greed) for a DAC to perform sub-optimally with normal USB inputs.
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