Review of the ASUS Xonar Essence STU DAC/Amp. ASUS's most recent DAC/amp gets put to the test. This time, the Xonar Essence One gets a new little brother in the Essence STU. The new STU is a sleek-looking, small foot-print DAC/amp with excellent specs. We put it to the test to see how it measures up to other similar solutions.
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