Redefining Hi-Res Audio with USB-C DAC HiFi Digital Earphones

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 Nebula proves invaluable for immersive gaming, video watching, and music listening.

High-Performance DAC HiFi Digital Earphones

Pay for one IEMs, get a HiFi combo set – what a deal! Say goodbye to the traditional headphone jack with the HIDIZS ST2 Nebula, the world's first USB-C in-ear digital monitors featuring the high-performance DAC chip ES9281C PRO. This small yet powerful built-in DAC unlocks every lossless detail. The 2-in-1 solution serves as an essential portable mini audio decoding device, enhancing audio experiences and delivering Hi-Res music in various usage scenarios.

HIDIZS ST2 Nebula with 10mm Dual Magnetic Dynamic Driver

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 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.

What is DAC?

Through the songs of humpback whales, we immerse ourselves in the beauty of nature's melodies, aligning with HIDIZS's consistent philosophy of restoring natural sound. With our  partnership with WDC, we hope to share the songs of these ocean singers with music and nature enthusiasts while supporting WDC's exceptional dedication to safeguarding whales and marine ecosystems. Our hope is to connect with people who love music and nature through the MP143 Salt.

ST2 HiFi Digital Built-in DAC VS Desktop DAC/Portable DAC & AMP

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 rivals mainstream headphone amplifiers while remaining portable and user-friendly.

What is DAC?

Through the songs of humpback whales, we immerse ourselves in the beauty of nature's melodies, aligning with HIDIZS's consistent philosophy of restoring natural sound. With our  partnership with WDC, we hope to share the songs of these ocean singers with music and nature enthusiasts while supporting WDC's exceptional dedication to safeguarding whales and marine ecosystems. Our hope is to connect with people who love music and nature through the MP143 Salt.

ST2 HiFi Digital Built-in DAC VS Desktop DAC/Portable DAC & AMP

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 rivals mainstream headphone amplifiers while remaining portable and user-friendly.

NebulaSound ST2: Delivering High-End Sound in a Compact Design

The HIDIZS ST2 Nebula USB-C DAC HiFi Digital In-ear Earphones feature the ES9218AC PRO decoding chip, providing exceptional audio quality with a PCM sampling rate of 32-bit/384KHz and Native DSD 64/128.

Hi-Res Audio Made Easy: USB-C Plug-and-Play for iPhone15 & More

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.

Universal HiFi Compatibility: Effortless Integration Across Platforms

HIDIZS ST2 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.

Unlock Hi-Res/MQA Format: TIDAL, SPOTIFY, Apple Music and Beyond

Equipped with an independent decoding chip, the ST2 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 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.

Enhanced Control and Clarity: Advanced In-Line Control and HD Microphone Support

The ST2 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.

Zero Latency HiFi: Immersive Authentic Audio without Any Delay

With professional audio decoding, the ST2 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: High-performace decoding DAC with HiFi in-ear monitors offer simplicity, efficiency, and portability for all scenarios, including commuting, homing, sporting, traveling, and entertainment.

See the Sound: Transparent Design with Sample Rate Indicator

Experience the ST2 Nebula’s innovative design with a transparent window that showcases its high-performance digital DAC. This feature offers a direct view of the ES9281AC PRO DAC decoding chip and intricate component layout inside the aluminum alloy shell. With the sample rate indicator, you can visually assess audio quality at a glance—each lighting effect represents a different sample rate, adding a captivating visual layer to your listening experience. Enjoy the seamless fusion of light, sound, and high-fidelity audio with the ST2 Nebula.

Unleash the Power of USB-C DAC HiFi Digital In-ear Earphones

Experience the richness, outstanding clarity, and detail in every note with its high-performance built-in DAC and the magic of 2-in-1 innovation.

HIDIZS Acoustic Special: Customized 10mm Dual Magnetic Circuit Dynamic Driver

The ST2 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.

Hi-Fi Compatible: Standard Detachable 2-Pin/MMCX IEMs with HiFi Digital USB-C Cable

HIDIZS offers a high-end USB-C audio cable featuring a powerful DAC and durable 0.78mm 2-pin connector, delivering strong audio and stable signal transmission. With output up to 70mW+70mW@32Ω, it efficiently drives any IEMs or headphones. No need for costly DAC & AMP combos—swap in any 0.78mm 2-pin or MMCX IEMs to experience this pioneering HiFi digital USB-C cable, perfect for audiophiles and music enthusiasts.

* HiFi Digital USB-C Cable for MMCX IEMs available separately.

High-Purity Oxygen-Free Copper Hi-End Professional Cables

ST2 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.

Ergonomic Design for Long-lasting Comfort

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.

HIDIZS Tuning Style: Perfectly Aligned with H-2019 Target Curve and Live Sound Tuning

The ST2 Nebula digital music 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.

Hi-Res Certified Excellence: Rediscover Your Music with the HIDIZS

As an officially Hi-Res certified audio product, the HIDIZS ST2 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 Nebula.

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HIDIZS Liquid Silicone Ear Tips & Customized Pouch

HIDIZS Liquid Silicone Ear Tips are made of high-permeability liquid silicone, designed ergonomically to snugly fit the ear canal. The customized pouch provided by HIDIZS ensures safe storage and prolongs the usage life of ST2 Nebula worry-free.

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What’s in the Box

* 1 x ST2 PRO
* 3 Pairs x Ergonomics Silicone White EarTips
* 1 x USB-C to USB-A Aapter
* 1 x HIDIZS Pouch Bag
* 1 x User Manual
* 1 x Warranty Card
* 1 x Product Quality Certificate

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HIDIZS Liquid Silicone Ear Tips & Customized Pouch

HIDIZS Liquid Silicone Ear Tips are made of high-permeability liquid silicone, designed ergonomically to snugly fit the ear canal. The customized pouch provided by HIDIZS ensures safe storage and prolongs the usage life of ST2 Nebula worry-free.

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What’s in the Box

* 1 x ST2 PRO
* 3 Pairs x Ergonomics Silicone White EarTips
* 1 x USB-C to USB-A Aapter
* 1 x HIDIZS Pouch Bag
* 1 x User Manual
* 1 x Warranty Card
* 1 x Product Quality Certificate

High-Perfomace DAC Specificaitons

Chip Model

ES9281AC PRO

ES9281AC PRO

ES9281AC PRO

Chip Architecture

HyperStream®II QUAD DACTM Architecture

HyperStream®II QUAD DACTM Architecture

HyperStream®II QUAD DACTM Architecture

Resolution

32-Bit

32-Bit

32-Bit

Sampling rate

PCM 32-bit/384KHz
Native DSD 64/128

PCM 32-bit/384KHz
Native DSD 64/128

PCM 32-bit/384KHz
Native DSD 64/128

MQA

Distortion

0.0012%

0.0012%

0.0012%

HiFi Digital Earphones Specificaitons

IEMs Color

- White Transparent
- Black Transparent

IEMs Driver

10mm dual magnetic circuit dynamic driver

IEMs Design

Resin + Aluminum alloy etching

IEMs Design

0.78mm/2PIN

0.78mm/2PIN

MMCX

In-line Control

FAQ

Can't find the answer to your question? Join the HIDIZS official Discord server and discover what other users think about the ST2 Nebula.

Not only our HIDIZS Crew, but all HIDIZS lovers in the server will be more than willing to share their thoughts!