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Small silver USB-C dongle with 3.5mm and 4.4mm headphone jacks, smooth volume wheel

Fosi Audio

Fosi Audio DS2 USB-C DAC Headphone Amp 3.5mm 4.4mm Balanced CS43131

SKU CH-44C2-ET68K

Portable USB-C DAC and headphone amplifier with dual CS43131 chips, 3.5 mm and 4.4 mm outputs, 510 mW balanced power, PCM 384 kHz and DSD256 support

  • TypeAmplifiers
  • Flagship dual CS43131 DAC chips deliver 109dB SINAD purity
  • 510mW balanced output drives demanding headphones with 4.4mm connection
  • PCM 32bit/384kHz and DSD256 support for high-resolution playback
  • Ultra-low 0.0001% THD and 130dB SNR ensure transparent sound
  • Low-power USB-C design preserves phone battery during long listening sessions

Portable USB-C DAC and headphone amplifier

The Fosi Audio DS2 is a compact USB-C dongle that adds high-resolution digital-to-analogue conversion and amplification to phones, tablets or laptops. Dual Cirrus Logic CS43131 DAC chips decode PCM up to 32-bit/384 kHz and DSD256 while maintaining an ultra-low noise floor and minimal distortion. It draws little power from the host device, so listening sessions stay long without battery anxiety.

For headphone listeners who want balanced

The 4.4 mm balanced jack delivers up to 510 mW per channel into 32 Ω, while the 3.5 mm single-ended jack provides 130 mW per channel into the same load, covering most mainstream headphones. Volume control is implemented with a smooth analogue knob for fine adjustments. Buyers whose headphones demand significantly more power or who require desktop-grade connectivity should consider larger units.

Dual CS43131 DAC chips with 130 dB SNR

The pair of flagship DAC chips achieves a signal-to-noise ratio of 130 dB and a SINAD of 109 dB at a THD of 0.0001 %, defining the transparency ceiling of this device. Supported sample rates reach PCM 32-bit/384 kHz and DSD256, so the internal conversion stage is the specification that determines whether the DS2 matches a listener's source files and quality expectations.

Highlights

  • Flagship dual CS43131 DAC chips deliver 109dB SINAD purity
  • 510mW balanced output drives demanding headphones with 4.4mm connection
  • PCM 32bit/384kHz and DSD256 support for high-resolution playback
  • Ultra-low 0.0001% THD and 130dB SNR ensure transparent sound
  • Low-power USB-C design preserves phone battery during long listening sessions

Specifications

TypeAmplifiers

Questions about this item

How do I know the DS2 is decoding correctly after I plug it in?

The unit supports PCM up to 32bit/384kHz and DSD256; most source devices show the active sample rate in their audio settings so you can verify the stream matches the file.

What comes in the box and what must I buy separately?

The package includes the DS2 dongle itself; you will need a USB-C to USB-C or USB-C to Lightning cable and headphones with a 3.5mm or 4.4mm plug, which are not supplied.

Which output should I choose between the 3.5mm and 4.4mm jacks?

The 3.5mm single-ended jack delivers 2×130mW at 32ohm while the 4.4mm balanced jack delivers 2×510mW at 32ohm, so pick balanced for harder-to-drive headphones and single-ended for easier loads.

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