ST2 PRO: Next-Gen DSP Revolution in USB-C DAC HiFi Earphones

If you’re looking to enhance your Hi-Res audio experience on your iPhone 15/iPhone 16 or any other USB-C-enabled device without spending a fortune, HIDIZS’ new ST2 PRO Nebula 2-in-1 innovation combining high-performance built-in DAC with HiFi in-ear monitors (IEMs), absolutely be just what you need! Unlock the full potential of your music journey with support for Hi-Res and MQA online streaming media experience, ensuring every nuance is faithfully reproduced.

While digital earphones are available, their sound quality often falls short. Many use DSP (Digital Signal Processor) chips to optimize or modify audio signals, but this doesn’t meet the demands of audiophiles.

Enter the HIDIZS ST2 Nebula, the PRO version—a revolutionary solution featuring a custom-designed ES9281AC PRO DAC chip from ESS, which redefines digital earphones sound quality. Welcome to the Next-Gen DSP HiFi Evolution. The ST2 PRO Nebula breaks through the limitations of traditional earphones design and ushers in a new era for HiFi In-ear Monitors, providing consumers with a superior HiFi earphones experience.

| Head-Fi | HeadFonics | Chris Love(Mobileaudiophile) | MIYABI /CAR AID ch | MC Reviews| kirintello | bisonicr | RNARexperience | Ongpapi | Obscure Mics | Aura-Fi Review | QkotmanYT | kzndenis | Yorkies Bits and Bobs Home Tech | Jose Vazquez | Technowday ID | Denxx | AndroidExpertShow | Kindlefirehditaly | JTECH KEYBOARDS | ikmさん | MOTHERX1 | XALIRATE | Aura-Fi review | AurIEMs | RonOnTech | Briant Otmen | AudioCell | Technicational | Ray Raditya | Howard | aftersound review(Head-Fi) | Sat03 Labs | AudioMonsta.com | Porta.Fi | Droid X – Luis Enrique NZ | NAER | SupraPixel | Master Marslander | AndyAudioVault |  littlenezt(Head-Fi) | Jaytiss | 

Experience zero-latency transmission for seamless audio and enjoy convenient in-line control and crystal-clear communication with the HD microphone, designed for audiophiles, music lovers, and gamers who prioritize every millisecond, every Hi-Res music note. ST2 PRO Nebula proves invaluable for immersive gaming, video watching, and music listening.

Pay for one IEMs, get a HiFi combo set – what a deal! Say goodbye to the traditional headphone jack with the HIDIZS ST2 PRO Nebula, redefining Hi-Res audio with USB-C HiFi digital In-ear monitors featuring the high-performance DAC chip ES9281AC PRO. This small yet powerful built-in DAC unlocks every lossless detail. Unlike other In-ear Monitors, the 2-in-1 solution serves as an essential portable mini audio decoding device, enhancing powerful audio experiences and delivering Hi-Res music in various usage scenarios.

With Hi-End-level components and HIDIZS customized 10mm High-Performance Dual Magnetic Circuit Dynamic Driver, certified as Hi-Res and tuned based on the H-2019 curve, this IEMs guarantees the highest audio quality.

For music enthusiasts and HiFi audiophiles, ST2 PRO Nebula brings accurate audio response, balanced and natural sound, powerful low frequency, rich mid frequency, and moderate high-frequency extension.With a frequency response range of 20Hz to 40kHz, suitable for a variety of different music styles, especially pop, metal and rock, etc. 

The ST2 PRO Nebula USB-C DAC HiFi Digital In-ear Earphones feature the ES9218AC PRO decoding chip by ESS™ Technology, offering top-tier audio quality with a PCM sampling rate of 32-bit/384KHz, Native DSD 64/128. Integrated with a SABRE® Headphone DACs, it delivers powerful output of up to 70mW+70mW@32Ω with DNR+122dB and THD of 0.0012%, ensuring exceptional Hi-Res audio quality comparable to mainstream decoding headphone amplifiers, all while maintaining portability and simplicity. 

When purchasing a pair of IEMs, a DAC & AMP or music player is often required to drive sufficient power for enjoying detailed lossless audio. However, with the HIDIZS ST2 Nebula’s HiFi digital built-in DAC, you’ll find a much more compact and lightweight design than Desktop DAC/Portable DAC & AMP, yet it maintains impressive ultra-low distortion performance and offers superior quality compared to Bluetooth wireless earbuds.

The digital built-in DAC of the ST2 PRO Nebula features a unique transparent window on its aluminum alloy shell, offering a direct view of the delicate component layout inside, including the core ES9281AC PRO DAC professional decoding chip and sampling light.

Looking for a hassle-free way to assess audio quality? The ST2 PRO Nebula retains the sample rate indicator, providing an intuitive display of the current audio file’s sample rate. Each lighting effect represents a different audio experience, adding a visual dimension to your music journey. The fusion of light and sound enhances your musical experience.

With Hi-Res audio support and a high-performance DAC, it represents a significant audio upgrade for your latest smartphones, including iPhone 15, 15 Pro, and 15 Pro Max, iPhone 16, 16 Plus, Android phones, Mac, PC, or any other USB Type-C device accessing your favorite Hi-Res albums, podcasts, videos, games and more across all your devices. Simply plug and play without any additional setup.  

HIDIZS ST2 PRO Nebula offers seamless compatibility across major operating systems, including Windows, iOS, macOS, Android, and HarmonyOS and more. With a professional audio digital-to-analog conversion solution in its USB-C connector, it delivers HiFi audio performance on mainstream multimedia platforms—whether you’re using a computer, tablet, iPhone, or Android device.

Equipped with an independent decoding chip, the ST2 PRO Nebula IEMs support up to 8X unfolding MQA online streaming media playback from multi platforms like Apple Music, Tidal, HiBy music or Spotify, experience every lossless detail with ST2 PRO Nebula you’ve been missing out on when using AirPods Pro 2 (compressed Bluetooth connections) or any other Non-HiFi USB-C earphones.

Note: ST2 Pro version, ES9218AC PRO with MQA version, the actual unfolding factor depends on the playback device/software/audio file.

The ST2 PRO Nebula not only supports in-line control but also features a high-definition microphone. Plugging it in enables digital IEMs to convert microphone audio streams to 24-bit /48 kHz, ensuring clear voice transmission no matter calling or gaming.It discreetly elevates your on-the-go lossless audio experience.  

* In-line control and HD microphone are not supported on iPhone Lightning models.

With professional audio decoding, the ST2 PRO Nebula Type-C in-ear earphones ensure zero-latency audio transmission. Featuring a wide soundstage and 20Hz-40kHz frequency response, they accurately reproduce audiovisual game scenes without delay, providing an immersive experience. 

The 2-in-1 Solution: Built-in decoding DAC with HiFi in-ear monitors offer simplicity, efficiency, and portability for all scenarios, including commuting, homing, sporting, traveling, and entertainment.

The ST2 PRO Nebula features a customized 10mm dual magnetic circuit dynamic driver crafted by the Hidizs Acoustic Laboratory. Its PU+PEEK composite diaphragm ensures uniformity and lightweight quality. The dual magnetic circuit design enhances efficiency, extends high frequencies, improves detail expression, and reduces nonlinear distortion for complete audio detail presentation.  

USB-C DSP Earphone Cable Fit All IEMs? Yes! The Next-Gen USB-C DSP Earphone Cable is a game-changer, offering a high-performance DAC with DSP technology in a professional-grade cable. Compatible with any 0.78mm 2-Pin/MMCX IEMs (In-ear Monitors), it delivers a powerful output of up to 70mW+70mW@32Ω—enough to drive most headphones and IEMs effectively. Pair it with your favorite IEMs for a fun, customizable, and surprising listening experience. It’s definitely worth a try! And a must-have for audiophiles and music lovers alike!

* USB-C DSP Earphone Cable for MMCX IEMs available separately.

ST2 PRO Nebula features high-purity oxygen-free copper cables, renowned for their superior performance in the low and mid-range frequencies, providing rich, detailed sound reproduction with natural tonality and expansive soundstage. Encased in tightly woven textile material, these cables are durable, resilient, and lightweight.

The earphone shell, crafted from German-imported Byer resin through a single molding process, offers stability, skin-friendly comfort, and durability. Its external structure is meticulously designed for a personalized fit, reducing external noise and ensuring long-lasting comfort for extended wear. 

The ST2 PRO Nebula digital music In-ear Earphones are calibrated and tuned by the HIDIZS Acoustic Laboratory, adhering to the H-2019 target curve for accurate audio response. They offer balanced tonality, powerful bass, rich midrange, and moderate high-frequency extension, meeting Hi-Res audio standards for a HiFi-grade listening experience.

As an officially Hi-Res certified audio product, the HIDIZS ST2 PRO Nebula meets the stringent standards set by the industry. Immerse yourself in the richness and detail of high-resolution audio, as every nuance and subtlety of your favorite tracks is faithfully reproduced. Rediscover your music collection and experience it like never before with the ST2 PRO Nebula.

HIDIZS provides four personalized models based on users’ usage scenarios and actual needs. For detailed specifications and comparison, please refer to the table below: