Which R2R DAC?
The R2R DAC I have is Holo Audio May L3 KTE. It’s USB receiver already has built-in isolation and regeneration, but the use of another USB isolator at the music server side improves sound quality further.
I briefly tested MSB Discrete using the same music server. It sounds better without USB isolator at the music server side, just plug MSB's external USB Isolator (connected to Discrete with dual optical) to the motherboard’s USB2 port directly.
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