Hidizs S9 Pro Review


In this article, we review the Hidizs S9 Pro, an upgraded version of the brand’s DAC/AMP dongle, available for just €/$119 Euro/USD.


Disclaimer: the Hidizs S9 Pro was sent to us, free of charge, by the brand in exchange for our honest opinion. 

About Hidizs

Founded in 2009 by Tamson Tan, Hidizs offers a full range of DAPs, DAC/Amps, and IEMs which all share the same DNA: good sound, and affordable prices. And if their first model, the AP100, was one of the quirkiest devices I ever held in my life, it was still a solid alternative against FiiO’s or Shanling’s players, for a lesser price.


Then, for their second-generation player, the AP200, the brand decided to launch a Kickstarter, which appeared to be quite successful as Hidizs managed to raise no less than $280,000, with 943 backers. A great success that pushed the brand in a whole new direction, where each new product was crowdfunded: AP80, ms5, or the new S3Pro.

But that doesn’t apply to the Hidizs S9 Pro, the DAC/Amp we are reviewing today, who came through the regular channel. A USB-key sized DAC, allegedly twice more powerful than the previous model, thanks to the new ESS Chip. Success? We’ll find out.

Design & Build Quality


Like the Fiio KA1 we reviewed a few days ago, the Hidizs S9 Pro is one of the most portable DAC I tried recently. End to end, the S9 Pro is just 59 mm long, 18 mm wide, and 8mm thick. But, the most impressive feature is assuredly the weight of the device: just 11g – that’s less than some of my IEM! To those measurements, you can add the USB-C cable (bundled) or Lightning to USB-C one (third party like ddHiFi). Thanks to that, the DAC can easily be carried in a jean’s pocket, a jacket, or simply stick to your phone if you’re ok with QI-wireless charging


Entirely made of aluminum, the Hidizs S9 Pro is quite good-looking, especially in the silver-tone finish like the one I received, but might appear less sturdy than its competitors, mainly due to its weight. It’s a completely different beast compared to the FiiO KA3 and KA1, which display a thermal radiator-like design with large heatsinks, while the S9 Pro adopts a sleek design with a smooth surface across its entire body.

In short terms: a neat DAC with a proper design.

Build Quality

Like every product recently released by the brand, the Hidizs S9 Pro is absolutely flawless in this regard. Made of one solid piece of aluminum, cut through CNC machine, the DAC shows an immaculate, screw-less design, from top to bottom. 

The USB port is quite sturdy, thanks to its recessed design, and the same goes for the headphone port, available on the other side. Speaking of the port, this is where you have the sole visual quirks of this DAC, as Hidizs stacked a 2.5mm port above the 3.5mm one, by adding a small bump, hosting the little plug.


Apart from that, everything looks and feels nice to grasp, and some might find this one more comfortable to hold than the FiiOs. Still, my top choice for premium DAC, remains the  Maktar’s X2 Lightning Dongle, with its matte-black tubular frame, and top-of-the-line cable. On the contrary, the provided USB-C cable falls flat on the S9 Pro, the sheath is too rigid and feels a bit too cheap in the hand.

All in all, it’s a very solid piece of work, and it really gives a good impression.


Like every modern DAC, the Hidizs S9 pro can be connected to most digital sources with ease. I tried it on my PC (Windows 10), MacBook (OSX), iPhone and iPad with a ddHiFi TC28i and finally the Hidizs AP80Pro-X, all worked flawlessly.

There is no specific drivers, but since the S9 supports ASIO drivers, it should be able to decode high-resolution files directly.


Comfort and Specifications

Daily use

As expected, the Hidizs S9 Pro is extremely simple to use.

You plug it into your phone, insert your headphone jack, and you’re good to go. There were no issues with my iPhone 13 Pro Max + TC28i + USB-C + S9 Pro, or with my MacBook: each time, the S9 Pro was immediately recognized by the source, and music came out almost instantly.  On Windows, I had to wait a minute, until the OS got the right driver but after that, it worked flawlessly. Again, Hidizs only provides a USB-C to USB-C cable, plus a USB-C to USB-A adapter, so you’ll have to purchase a Lightning adapter separately.

On the go, it’s a pleasant device to use, and the small size is great for commuters like me. The lightweight body makes, combined with the elongated design, makes it easy to fit in a pocket. And, if the default cable doesn’t ply correctly, once replaced by ddHiFi TC05, the combo Hidizs S9 Pro + iPhone fitted right in my jeans pocket.


Unlike NuPrime’s Hi-mDAC – but like every other USB-DAC – there are no volume controls on the S9 Pro: everything has to be done from your source directly.  Last but not least, underneath the logo, Hidizs have hidden an led indicator, indicating the current sampling rates:

  • green for PCM files up to 96kHz
  • blue for PCM files up to 192kHz
  • red for PCM files up to 384kHz
  • white for PCM files up to 768kHz
  • yellow for DSD files up to DSD128
  • purple for DSD files up to DSD512

Let’s take a quick look at the specs now.


Like the EarMen Tr-Amp or FiiO’s KA3, at the heart of the Hidizs S9 Pro, you’ll find the old, but powerful, ESS Sabre ES9038Q2M. Top of the line from ESSTech mobile chip line-up.

An excellent DACC, advertised as a high-performance 32-bit, 2-channel audio D/A converter, capable of great lengths thanks to various integrated DSP functions and technologies like Time Domain Jitter Eliminator, or the now-famous HyperStream II architecture. More than enough to, on paper at least, suit even the most demanding audiophile.


All in all,  you get: 

  • up to 32bits / 768kHz PCM decoding + DSD512 support
  • high power output – 200mW in Balanced mode, 100mW in Single-Ended
  • 120dB SNR and 80dB of channel separation in Single-ended mode
  • 119dB SNR and 118dB Channel Separation in Balanced mode
  • ASIO and Windows driver’s full support

A good setup that should be able to drive the most demanding headphones, even if high-end and planar will need higher-end solutions. Still, apart from the missing MQA support, this is a great circuitry, outperforming many competitors available in the same price range, at least on paper.

For the nerds out there, here are the full specs.


Technical specs

  • Type: USB DAC
  • Model: Hidizs S9 Pro
  • Chipset: Sabre ES9238Q2M
  • Frequency range: 20 – 50 000Hz
  • Compatibility: PCM up to 32bit/768kHz – DSD up to DSD512
  • SNR: 120dB
  • THD: < 0.0006%
  • Output power: 100mW @ 32 ohms (SE) – 200mW @ 32ohms (Balanced)
  • Size: 40 mm x 15 mm x 8 mm
  • Weight: 10g
  • Socket: USB-C or Lightning (8-pins)
  • Price: €/$119

Let’s check the sound now.

The article continues on Page Two, after the click here

4.3/5 - (85 votes)

A nerdy guy with a passion for audio and gadgets, he likes to combine his DAC and his swiss knife. Even after more than 10 years of experience, Nanotechnos still collects all gear he gets, even his first MPMAN MP3 player. He likes spreadsheets, technical specs and all this amazing(ly boring) numbers. But most of all, he loves music: electro, classical, dubstep, Debussy : the daily playlist.


  • Reply May 27, 2022

    Jeroen Wijnands

    Could this power my old 250 ohm DT770?

  • Reply October 9, 2022

    Gérald Forget

    S9 Pro gets very hot and drains IPad current quickly, more so than Red Dragonfly which I owned. Its boxy shape makes it much less agreeable to hold than Dragonfly’s rounded edges. Hidizs cable (Lightning to USB-C) purchased at the same time to connect with IPad was found defective after 4 months of normal use, within warranty period. Three months after we have agreed to compensate with a replacement adaptor, nothing was received and, furthermore, [email protected] failed to answer my last request. I will not buy from this company again and cannot recommend it.

  • Reply November 26, 2022


    How does it compare to Dragonfly Cobalt or Red?

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