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Start shoppingThe influence of mains power on hi-fi systems is widely misunderstood or ignored. Audio electronics can only sound as good as the AC mains supply that goes into them, which can pick up large amounts of radio-frequency interference (RFI) on its way to them. Tellurium Q never discloses its design details, but suffice to say with the Black II it really did its homework. The result is a great-sounding, premium-priced mains cable that’s a meaningful upgrade to high-end systems.