S9 Review - Audio Science Review


This is a review and detailed measurements of the Hidizs S9 USB-C DAC and headphone amplifier. It was kindly purchased new by a member and drop shipped to me. The S9 costs US $112 on Amazon including Prime shipping. There is a 5% discount there as of this writing.

The S9 comes a in stout thumbnail sizes package:

There are no controls on it unlike S8. A multicolor LED indicates the sample rate of the music being played. It is quite bright.

The predecessor to S9, the S8 had up down volume control which I miss here.

You now have a choice of balanced and unbalanced outputs:

No USB-C cable came with it which was surprising as they almost always include such.

In use, the S9 got a bit warm indicating it is rather power hungry.

Hidizs S9 Measurements
Let's start with our usual dashboard of 1 kHz tone, testing both outputs (2.5mm balanced and 3.5mm unbalanced):

Hidizs delivers once again with desktop class performance. Distortion is well below threshold of audibility and we have 4 volts output which should produce lots of power for high impedance headphones.


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