Audiophilepure

https://www.stereophile.com/content/ps-audio-perfectwave-directstream-mk2-da-processor

With the original DirectStream’s volume control set to its maximum of “100” and the Parasound monoblocks set to high sensitivity driving the KEF LS50s, I could hear no hiss with my ear pressed against a tweeter. (For my auditioning, I used the Parasounds set to their lower sensitivity and the PS Audio’s volume set to “76,” ie, 12dB below the maximum.) Repeating the exercise with the MK2, some noise was audible, but I couldn’t hear it if I moved more than a few inches away from the speaker. The level of this noise didn’t change if I lifted the USB ground via a Menu setting, and it wasn’t affected by the setting of the MK2’s volume control. It might be best, then, to avoid using the built-in volume control in a system with high-sensitivity speakers, like the Klipsch La Scala Alex Halberstadt reviewed in April 2023, where the music volume may need to be turned down to levels at which this noise becomes troublesome.

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