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Fosi Audio DS3 Portable Hi-Res DAC & Headphone Amplifier
The Fosi Audio DS3 Portable Hi-Res DAC & Amp is a no-compromise USB-C dongle DAC built for audiophiles and serious gamers who demand flagship decoding, hardware-level spatial audio, and absolute portability. Featuring the ESS Sabre ES9039Q2M DAC, XMOS POWERED processor, and true balanced output, the DS3 delivers reference-grade sound from smartphones, PCs, laptops, PS5, and Nintendo Switch—without batteries, drivers, or complexity.
Designed to be both music-accurate and game-dominant, the DS3 combines ultra-low distortion, massive dynamic range, and intelligent hardware DSP to elevate every listening session—whether you’re chasing micro-details in high-resolution tracks or pinpointing footsteps in competitive FPS titles.
Flagship ESS Sabre ES9039Q2M – Reference-Grade Decoding
At the heart of the DS3 lies the ESS Sabre ES9039Q2M, a top-tier DAC capable of PCM 32-bit/768kHz and native DSD512 decoding. With an ultra-clean signal path delivering ≥122 dB SNR and <0.0003% THD+N, the DS3 reproduces music with exceptional transparency, precise imaging, and lifelike dynamics—faithful to the original recording.
From subtle orchestral textures to punchy electronic basslines, every detail is rendered with authority and control.
World’s First Battery-Free XMOS POWERED DAC/Amp
The DS3 is the world’s first portable DAC/amp to integrate XMOS POWERED in a battery-free design. Its dual-core 1.6 GHz processing engine ensures rock-solid clocking, ultra-low latency, and lossless data transfer from source to DAC—maximizing the full potential of the ES9039Q2M.
The result: stable, jitter-free playback across phones, PCs, consoles, and handheld devices with minimal power draw.
Hardware-Level 7.1 Spatial Audio – No Software Required
Fosi Audio’s proprietary hardware spatial audio algorithm transforms standard stereo signals into virtual 7.1 surround sound, creating a realistic 360° soundstage—entirely at the hardware level.
No drivers. No apps. No system interference.
Just immersive positional audio for both gaming and cinematic content.
Dedicated FPS Mode for Competitive Gaming
The FPS sound mode is precisely tuned to enhance footsteps, reloads, and gunfire, giving you a decisive positional advantage in shooters. Supporting UAC 1.0, the DS3 connects directly to PS5 and Nintendo Switch for true plug-and-play gaming—no configuration needed.
HiFi & Gaming Dual Modes with Advanced Customisation
The DS3 supports both UAC 2.0 (Hi-Res Music) and UAC 1.0 (Console Gaming), with volume memory retained in both modes. Fine-tune your sound using:
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8 PCM digital filter options
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8-band hardware-level PEQ (adjustable via web-based control panel)
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Gain control for sensitive IEMs or demanding headphones
All tuning is handled at the hardware level—ensuring zero digital degradation.
Ultra-Light Premium Design
CNC-milled from aerospace-grade aluminum, the DS3 weighs just 16 grams. A unique tempered-glass skylight reveals the internal circuitry, blending industrial elegance with functional minimalism—perfect for portable audiophile setups.
Specifications
DAC Chip: ESS Sabre ES9039Q2M
USB Audio Processor: XMOS POWERED
Input: USB-C
Outputs:
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3.5mm Single-Ended
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4.4mm Balanced
USB Audio Class: UAC 2.0, UAC 1.0
Maximum Sampling Rate:
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UAC 2.0: PCM 32-bit/768kHz, Native DSD512, DoP DSD256
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UAC 1.0: PCM 16-bit/48kHz
Maximum Output Power:
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3.5mm: ≥120mW ×2 @ 32Ω (THD+N <1%)
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4.4mm: ≥220mW ×2 @ 32Ω (THD+N <1%)
Frequency Response: 20Hz – 48kHz (±0.2dB)
Signal-to-Noise Ratio (SNR):
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3.5mm: ≥122dB
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4.4mm: ≥120dB
Dynamic Range:
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3.5mm: ≥119dB
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4.4mm: ≥116dB
THD+N:
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3.5mm: <0.0003%
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4.4mm: <0.0005%
Supported Headphone Impedance: 16–300Ω
Weight (Without Cable): 16g
Dimensions: 55 × 20 × 11 mm
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Pairing this Harman Target Version with a Samsung A17 playing Apple Music and FLAC files and Fiio X1 DAP as a secondary source with FLAC files. When tuned to give preference to Mids as i prefer to hear the voices more than anything else, this comes out as a sweet sounding combination and tracks like Racy Chapmans Fast Car and Massive Attacks Teardrop shine beautifully. The Castor Pros are best listened at about 40% volume and and infact they do actually sound amazing at a high volume for bass heavy tracks such as EDM but for Trance and Rock the cymbals and snare drums sound better at 40%. This pair of iems and the combo sounds like money well spent so far and next i want to try analytical IEMs like the 7Hz. Thanks to the Audio Store for the rushed delivery.
Great purchase... excellent product
Good Product as expected
Worth every penny! This is not for bassheads as it lacks just a bit on the bass department, but the separation is awesome and the sound stage is also huge. Awesome for gaming as well! (Apex Legends, Arc Raiders, PUBG)
This is the replacement for my purchase of moon drop dsp chu2 which I bought in aug 2025 i don't know how it got damaged from last it stopped working on left side buds and after a few days mic also stopped working and i forgot to claim the warranty for it . So find this spare cable very helpful since I love these IEMS for real Tq AUDIO STORETEAM FOR THE smooth delivery
Great job on packing of the product. As a gamer I can say that, for fps games like PUBG , CS2 etc., Castor Pro is the best in under ₹2000
I recently bought this and am incredibly impressed with it. The build quality feels solid and premium right out of the box.
When it comes to performance, the amplification is fantastic—it delivers a clear, noticeable boost to the audio power and volume without sacrificing clarity. It is also incredibly easy to use; completely plug-and-play with zero hassle.
An awesome bonus is the inclusion of the Type-A to Type-C dongle/adapter. It makes it incredibly versatile to connect to different devices right away without needing to buy extra accessories.
Overall, it's a great purchase and definitely worth the money. If you are on the fence, just get it!
As an all rounder it fits my taste quite well,the only problem it really has is the male vocals being a bit recessed (not terribly recessed if you use vocal eartips),they are a tad bit overpriced seemingly,divine planar might be better,but for people looking for a fun entry into iem's,it's worth the price (some people say it's included DAC isn't enough,it works well enough as a temporary solution,yet to test if a dac makes a big difference or not).
Unsure if this is how most iem's are but the cable felt a tad bit short.
I had never used an IEM before, so this was my very first experience and I was genuinely impressed. As someone who loves music, I can confidently say this is one of the best investments you can make for audio quality. The sound is exceptional and absolutely worth the price.
To get the best possible audio experience, I would also recommend pairing it with a good-quality DAC, as it significantly enhances the overall output. ....
This is the most balanced sounding IEM I've used in this price. I am using the Type C variant, and I haven't experienced any issue regarding the playback whatsoever. It is equipped with the DAC chip CX31993, which is found on the dedicated DACs around the price of 1K. The cable is also a 4-core silver plated copper one, with really nice build quality. These are also really responsive to EQ Settings, tweaking the audio balance using a 10 or 31 band EQ makes the experience even more versatile.
The only cons I have noticed are regarding the in-box ear tips, I didn't find them to be very comfortable, so I had switch them with some other ear tips. Although, the metal built of the IEMs give them a really premium feeling, the glossy surface is extremely prone to scratches and they still get scratched even after using cautiously.
It is good but could be a bit sharp sometimes may be balanced by EQ. But one problem in my type C unit, after 3 days it stop sound out of nowhere, while listening music, or watching movie/yt. Have to plug out plug in to get the audio back.
This is a magical DAC, I don’t believe ki isne mere headphones main jaan daal di ho
Really the quality of aurora ultra is out of the box , literally if you never use an iem and experience first time you feel actual music. Aurora ultra give life best experience.
This is only possible because of the audio that my first experience and the audio store surve there best to just create my best experience thanks a lot for protective, timely delivery and
Again thanks for giving that service and seamless experience to the team
AUDIOCULAR DAC Recommend asome sound quality it's pushing
Aswome experience with kz castor pro harman target Bass edition I never heard that quality of
Bass My second experience with iem aswome
