FOSI AUDIO SK02 Headphone Amplifier / Portable Preamplifier / DAC ES9038Q2M

3/4 front view of FOSI AUDIO SK02 New
With its SK02, Fosi Audio unveils a small, versatile, high-performance device that takes up the form factor of its SK01. The SK02 fulfills the functions of headphone amplifier, portable preamplifier and portable DAC. The SK02 features an ES9038Q2M DAC chip and a low-noise, high-speed SGM8262 operational amplifier chip. This enables the SK02 to support high-resolution streams up to PCM 32bit 384kHz and DSD256, with output power up to 1100mW.

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Shipping date: 23-04-2024.

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FOSI AUDIO SK02 Headphone Amplifier / Portable Preamplifier / DAC ES9038Q2M 32bit 384kHz DSD256

Fosi Audio SK02 picture

With its SK02, Fosi Audio unveils a small, versatile, high-performance device that takes up the form factor of its SK01. The SK02 fulfills the functions of headphone amplifier, portable preamplifier and portable DAC. The SK02 features an ES9038Q2M DAC chip and a low-noise, high-speed SGM8262 operational amplifier chip. This enables the SK02 to support high-resolution streams up to PCM 32bit 384kHz and DSD256, with output power up to 1100mW. It also features gain control (High and Low) to adapt to headphones with impedance ranging from 16 ohms to 300 ohms. Regarding inputs, the SK02 features USB-C and Toslink optical connectivity. Outputs include a 3.5mm jack and 4.4mm balanced jack headphone outputs, plus a 3.5mm jack/mini-Toslink auxiliary output for connection to an amplifier.

Fosi Audio SK02: ES9038Q2M DAC chip

The SK02 incorporates an ES9038Q2M DAC chip from ESS Technology. This 32bit stereo DAC is a high-performance chip specially designed for audiophile applications. It is based on HyperStream II architecture and enables the Fosi Audio SK02 to support 32bit 384kHz PCM and native DSD streams up to DSD256.

Photo of the Fosi Audio SK02 ES9038Q2M DAC chip
Photo of Fosi Audio SK02 with headphones

Fosi Audio SK02: Powerful headphone amplifier

The SK02 is capable of developing substantial headphone output power. Using an SGM8262 operational amplifier, its 3.5mm jack output reaches up to 280mW @ 32Ω of power, and its 4.4mm balanced jack output reaches up to 1100mW @32Ω of power, all while maintaining a THD < 0.001%. Two gain modes enable the SK02 to adapt to all types of headphones with impedance between 16Ω and 300Ω.

Fosi Audio SK02: Portable preamplifier function

An auxiliary output on a 3.5mm jack/mini-Toslink connector also allows the SK02 to be coupled to an amplifier. This transforms the SK02 into a portable preamplifier. If you're using the USB-C input, you'll need to use a 3.5mm jack as output, while if you're using the Toslink input you'll need to use a mini-Toslink connector for the SPDIF signal.

Photo of Fosi Audio SK02 with amplifier
Photo of the LEDs on the top of the Fosi Audio SK02

Fosi Audio SK02: An interface with LEDs

The top of the SK02 features several LED indicators. They make it easy to locate essential information about the current playback, such as sample type, gain setting and selected input mode.

Fosi Audio SK02: a multifunctional control knob

A large knob/potentiometer gives you access to the SK02's essential settings and controls.

Photo of volume controller

Volume adjustment

Turn the potentiometer for precise volume adjustment.

Volume control

Play/pause

Simply click on the button to access the play/pause function.

Volume mute function

Mute

Double-click to mute current playback.

Fosi Audio SK02 overview

Fosi Audio SK02 overview
1Input source selection
2Gain selection: High / Low
3LED indicators
4Multifunction button
53.5mm jack headphone output
6Balanced 4.4mm headphone output
7USB-C input / 5V DC power supply
8AUX jack 3.5mm/mini-Toslink output
9Toslink optical input

Technical characteristics

Specifications
Product typeHeadphone amplifier / Potable Preamplifier / Portable DAC
DAC chipES9038Q2M
Amplification chipSGM8262
Inputs1x USB-C input
1x Optical Toslink input
Outputs1x 3.5mm jack headphone output
1x 4.4mm balanced jack headphone output

1x AUX jack 3.5mm/mini-Toslink output
Supported sampling ratesUSB: PCM 32bit 384kHz, native DSD up to DSD256
Toslink optical: PCM 24bit 192kHz
Gain adjustment
Headphone output power3.5mm headphone output: 90mW @ 32Ω (Low gain) / 280mW @32Ω (High gain)
Balanced 4.4mm headphone output: 350mW @ 32Ω (Low gain) / 1100mW @32Ω (High gain)
Recommended headphone impedance16Ω-300Ω
Frequency response20Hz-20kHz (+/-0.02dB)
SNR3.5mm jack headphone output: 110dB (Low gain) / 116dB (High gain)
Balanced 4.4mm jack headphone output: 102dB (Low gain) / 113dB (High gain)
THD> 0.001%
Noise level3.5mm jack headphone output: 6.2uV
Balanced 4.4mm headphone output: 13uV
Crosstalk3.5mm jack headphone output: 110dB (Low gain) / 118dB (High gain)
Balanced 4.4mm headphone output: 103dB (Low gain) / 104dB (High gain)
General
Power supply5V DC via USB-C
Dimensions121 x 51x 43mm
WeightApprox. 300g
ColorBlack
Package1x Fosi Audio SK02 portable DAC headphone amplifier
1x USB-A/C to USB-C cable
 
Data sheet
InputOptical
InputUSB
OutputOptical Mini-Toslink
OutputJack 4.4mm
OutputJack 3.5mm
DAC / ADC ChipES9038Q2M
Max sampling rate384kHz
Max sampling rateDSD256
ColorBlack
ClassN/A
NetworkingNo
Remote ControlNo
 
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FOSI AUDIO SK02 Headphone Amplifier / Portable Preamplifier / DAC ES9038Q2M 32bit 384kHz DSD256
With its&nbsp;SK02,&nbsp;Fosi Audio&nbsp;unveils a small, versatile, high-performance device that takes up the form factor of...

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