Once you're past the DAC the signal is analog, just like the phono, tape or tuner. Sounds like they're selling tone controls rather than cables.
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Taters, Audience Adept manufacture a line of power conditioners that acually do what they were intended for, unlike so many others.
I would say they are one of a very few top manufactures on the Planet of power conditioners.
One listen to my system with Audience Adept conditioner and ac cords made me sell my Nordost Thor which was top dog in 2006.
So, I would try their suggestion.