Hidizs SD2 – handy, small, universal USB DAC

Small but mighty – this is the only phrase that comes to my mind after using USB type-C dongles of this kind. This time it is Hidizs SD2 – the newest USB dongle that is designed to squeeze more juice to drive headsets to the appropriate levels when compared to the integrated sound amplifiers. It is not the first take of Hidizs on dongle DACs and by this point they have quite an experience and knowledge to design tiny, yet powerful DAC&AMP. Although, there were always pros and cons of using such devices which would be described in this article.

Hidizs SD2 has been released to public only couple of days ago and the first 200 units would be sold at special prize (31,99USD).

Link to the official Hidizs store: LINK

Link to Amazon store: LINK

You can use ZMCR5OFF as 5% discount code.

First, specs&features:

As seen from the specs, SD2 is compatible with all types of devices out of the box, supports PCM32bit/384kHz sampling and DSD128, as well as in-line remote and mic. Therefore, it not only brings back 3,5mm jack output to all of the devices free from it by the hand of marketing managers, but also gives the possibility to enrich sound quality and use your phone functions in the most convenient way. Hidizs also claims that the sound has zero delay what makes it possible to watch videos and play games apart from listening to music.

Box contents:

Apart from the SD2 itself, you’d get USB A -> type-C adapter and Lightning -> type C adapter which covers most of the possible variety of modern devices. If I am not wrong, this is the first time when Hidizs adds lightning adapter to the bundle and makes this device fully compatible with Apple smartphones out of the box.

Design, fit and build quality:

SD2 is really small. Much smaller than most of the USB type-C dongles available from other brands. It is only 20×34,5x10mm in physical size and designed in such a way that 3,5mm output comes out of the case at 45 degrees angle. This clever design serves two roles: type-C port side has enough surface length to press against the device and eliminate side flex and headphones output brings the jack closer to the source device, making the load shoulder even smaller. In real life, SD2 sits quite securely at place and doesn’t make me feel that it would destroy type-C port of my phone. I can’t say that such hard-type of connection is better than using a cable in-between, but the connection itself is stronger than I thought it would be. On the other hand, such connection would depend of the type of bumper or case that is used with the smartphone. If it is thick and soft – SD2 would not feel that tight.

Device in use:

SD2 is designed to work straight forward out of the box – connect it to any source like Android smartphones or tablets, Windows PC or Apple smartphones and it should be recognized by the system as USB audio device. Furthermore, such apps as HiBy Music on Android would also recognize it as bit-perfect device to bypass system audio mixers and send data directly to USB.

Common for all Hidizs devices, SD2 shows incoming audio quality with different LED colors: red for PCM 44.1-48kHz and blue for PCM 88.2-384kHz & DSD128.

While using this device there were no noticeable lag in audio while watching movies, neither there was case heating or extraordinary fast smartphone battery drain. Seems that Hidizs did a good job on optimization on internal circuits.

Sound wise, first what I was after is the capability of SD2 to handle full-sized headphones such as Audio-Technika ATH-M50 and Logitech Astro A10. First is pretty tight closed back with 50Ohms impedance, second ae the gamins ones with a mic and 32Ohms impedance. All driven from Xiaomi Redmi Note 8Pro smartphone which is not great at all on its own 3,5mm headphone output. Not great means that it feels anemic, low powered, artificial, with smeared highs and soft on mid bass when trying to drive such types of headphones… SD2 definitely nails it and is capable of driving both at much more appropriate levels, bringing the life and juice to mid bass, much better clarity of treble, together with higher volume in overall. Music starts to feel more engaging and transparent, when each instrument has its place and room. Layering and imaginary scene gets better. And all of that is apparent, no need of recurrent tries. In my opinion, SD2 is doing much better that integrated dac/amp of this particular smartphone.


It is great that we still get the possibility to have 3,5mm headphone output in almost any device despite the decision of marketing that it is no longer valid for the end-user. Denying the will of having higher audio quality on wired headphones or IEMs and forcing to be content in bluetooth boundaries is more about making more profit on more expensive devices, rather than providing the best quality or unleashing the potential. It is great that there are such product as Hidizs SD2 that bring back the possibility, functionality, compatibility, quality and passion… SD2 is one of the smallest, yet capable devices that makes wired headphones useful again, while overcoming the shortcomings of the integrated circuits.

Link to the official Hidizs store: LINK

Link to Amazon store: LINK

You can use ZMCR5OFF as 5% discount code.

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