The Hidizs SD2 serves as a bridge for devices that lack a 3.5mm headphone jack but have a USB Type-C port. By integrating an ESS ES9270 DAC, it not only provides a physical connection for headphones with a 3.5mm plug but also significantly improves audio quality over standard analog signals. This is particularly useful for users of newer smartphones, laptops, and tablets that have removed the traditional headphone jack in favor of a more streamlined design focusing on USB Type-C ports.
The DAC (Digital-to-Analog Converter) within the SD2 converts digital audio files into analog signals with high fidelity, supporting up to 32-bit audio files. This ensures that users can enjoy high-resolution music that surpasses the quality of standard audio outputs. The inclusion of a high-quality DAC like the ESS ES9270 means the SD2 can provide clearer, more detailed, and richer sound compared to the built-in DACs of most devices.
We preferred to unite every reviewer’s impressions below. Pavan’s will be added when its available.
Box and Packaging, Hidizs SD2
Hidizs SD2 is low profile packaged. We met a cardboard package. However, the packaging is neat, but what is surprising is the standard equipment of the small dongle.
- Dimensions: 34.5×20×10ｍm
- DAC Chip: ES9270
- DSD: Native DSD64/128.
- PCM: Support up to 384 kHz/32 bit.
- Output option: Single-ended 3.5mm.
- Red Color: PCM 44.1–48 kHz.
- Blue Color: PCM 88.2–384 & DSD.
Once opened inside, we find the DAC embedded, and below we find the accessories:
– SD2
– Type C to lightning cable
– Manual + QC/warranty
Hidizs SD2 Sound
From our collective perspective, the Hidizs SD2 stands out as a premium USB-C to 3.5mm adapter with a high-quality ESS ES9270 DAC chip at its core. Mahir, who appreciates the natural output and texturing, noted that it can deliver a powerful and natural sound profile. Pietro highlights the device’s power and warmth, finding it capable of driving high-impedance IEMs effectively. From Chris’s viewpoint, the SD2 is celebrated for its fidelity, neutral tonality with a hint of brightness, and expansive soundstage. We appreciate that, despite some coloration in the midrange frequencies, the SD2 enhances the overall audio experience significantly, providing clearer, richer, and more detailed sound for its budget price. We see it as a valuable investment for listeners looking to bridge the gap left by the absence of a headphone jack on modern devices.
- Mahir’s take:
After releasing their globally acclaimed models last year, such as the MS5, MS3, and the already legendary MP145, with the latest dongle Martha featuring a beautiful upgrade over the S9Pro, Hidizs has now produced an adapter targeting only the USB-C output found on modern smartphones with the aim of playing music. This adapter and bundled iPhone compatible adapter may appear simple in design, but it houses the ES9270 chip and delivers 140 mW (2 x 70) at 32 ohms, which in my testing, provided a remarkably natural sound output even to a Samsung A54, known for its otherwise mediocre sound quality, through the Simgot EA1000. In my experience, wearing the EA1000 at SD2 allowed Sami Yusuf’s live performance of “Karitas” and the typical Middle Eastern focus on mid-high pitched percussions, stringed instruments, woodwinds, and brass to be reflected with exceptional success. However, in terms of technicality, it could not convey all the splendor of the EA1000. Yet, in this delicate performance, there is not a single exaggerated element. The texturing is also above average to good.
- Pietro’s take:
The newcomer contains a slightly dated but excellent chip, the ES9270, which, unlike the one mounted on the S3 Pro, produces 140 mW at 32 ohms. So this little dongle is definitely more powerful. I tested it on the 64-ohm EPZ x Tipsy and they drive them at excellent levels, and I don’t feel any fatigue on the bass, which remains nice and full-bodied. I also tested it with the Hidizs MS5 to see if it could outperform other levels of IEMs. I must say that on the iMac, I only need three volume levels and cannot go above halfway. With the addition of the 75 ohm adapter, you can reach the maximum volume; it is better to stay around 64 ohm at most. I think for the most part, the power is sufficient, but now there is also the Fiio KA11 on the market. In terms of sound, I struggle to distinguish the SD2 from the S3 Pro. Hidizs always follows that tone that is not too neutral but slightly warm. It helps to improve treble control while maintaining excellent detail on bright IEMs. I also notice some coloration in the midranges, but overall, I am pleased with the results.
- Chris’ Take:
From my perspective, I find the Hidizs SD2 to be a very easy device to enjoy. I was not saying this at first. The SD2 has an odd shape, which at the outset looks to be a bit… too odd. However, it’s in real time use that all of my worries were extinguished. With the small frame of the SD2 I actually found it very useful for mobile situations. On four separate occasions, I used the SD2 along with the Hidizs MS3 going out to market with my phone upside down in my right front pocket, and began to really love the style and design of this little device. Hidizs does nothing by chance and seems to think of everything. Maybe even things that we didn’t know that we needed. At any rate, the Hidizs SD2 has plenty of driving power under the hood.
I’m impressed with the overall sound fidelity that the SD2 is able to pump out. I mostly used sensitive iems for use with the SD2 and had plenty of headroom. Though, I did use the Hidizs MP145 often as well and found it to be a good combo. The SD2 has good dynamics with an open and spacious sound field. The tonality is more neutral to my ears with some spritz of brightness. The low end is tight, controlled and transients are expedient, with a punchy but not overemphasized bass region. The midrange carries the most emphasis, as the SD2 has a forward midrange which is nice for vocals without sounding too colored for my taste. The treble sounds nicely detailed and once again feels open with adequate air to this region. Again, the soundstage is wider, along with good imaging, which really does seek to make my earphones a joy to listen to. Honestly, for all the upsides to this little device, I find the Hidizs SD2 to be another home run for Hidizs. To be able to get such a device for so little money is a huge plus for consumers who simply want something to easily attach straight to their devices while having hi quality sound right in their pockets.
Pros:
– High-quality ESS ES9270 DAC chip
– Supports up to 32-bit high-resolution audio
– 140mW power output at 32 ohms (2 x 70)
– Forward midrange for vocal clarity
– Tight and controlled bass response
– Wide soundstage with good imaging
– Compact and portable design
Cons:
– Coloration in the midrange
– May not fully support high-end earphones’ technical capabilities
– Unconventional design might not appeal to all
– Presence of competitive alternatives in the market
– Energetic sound profile can be overly analytical for some tracks
Review Conclusions
The Hidizs SD2 emerges as a compelling option for those seeking an upgrade in their audio experience, characterized by its bright and energetic sound profile, whether in iPhones or Androids It closely mirrors the audio qualities of the S9 model, with a strong midrange focus and a high-end that sparkles and crisps, adding life to the listening experience. However, this vivacity sometimes introduces coloration, particularly noticeable in voices and percussion, which may come across as overly analytical or vibrant on certain tracks. Despite this, the SD2 excels at rendering micro-details against a quiet background, alongside quick and tight bass, especially for sensitive earphones. Its expansive and three-dimensional soundstage, complete with precise stereo imaging, offers clear separation between instruments and performers, showcasing its prowess in handling complex musical compositions.
Where to buy: https://www.amazon.com/dp/B09G9YMHV5
