FYI some jargon from Schiits webpage...
Linear, Low-Noise Power Supply—Built In
You won't need any "linear supplies" or other "add-ons" to improve Eitr—like all of our stackable products, we've built in a linear supply with multiple stages of ultra-low-noise voltage regulators. From the included 1.5A, 6VAC wall-wart to the output, there are no switching supplies in Eitr.