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Decoding Headphone Amp Integrated: Fosi Audio Upgrade DAC K4 is a digital decoder and HiFi headphone amplifier all-in-one, supporting optical, coaxial, USB Type-C. Mini Stereo Gaming DAC: Support 3.5mm headphone... Read more

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  • Decoding Headphone Amp Integrated: Fosi Audio Upgrade DAC K4 is a digital decoder and HiFi headphone amplifier all-in-one, supporting optical, coaxial, USB Type-C.

  • Mini Stereo Gaming DAC: Support 3.5mm headphone output with the microphone. It can provide you with excellent Hifi sound, ensures exquisite musicality, accurate and realistic phasing, and reproduction of the original sound!

  • Easily Fits Your Audio System: It can be used as a preamp or volume controller for your PC/MAC/Computer. Can also be used for power speakers and passive speakers(need amplifier).

  • Equipped With Multiple Chips Decoding: CT7601SR + MS8416 + PCM5100 + MAX97220 make higher resolution sampling rate, get lower distortion, more clear and detailed.

  • Treble and Bass Volume Adjustment: High precision tuning knob is easy to achieve precision volume, improves the music detail experience.


Specifications Details
Model K5
Chip Set CT7601SR + MS8416 + PCM5100 + MAX97220
Headphone Impedance 16Ω - 300Ω
Input Type USB Type-C, Optical, Coaxial, Microphone
Output Type 3.5mm Headphone, RCA
USB Sampling Rate 24Bit/96kHz
Optical/Coaxial Sampling Rate 24Bit/192kHz
THD ≤0.001%
SNR ≥110dB
Device Dimension 4.4*3.7*1.2 inch
Net Weight 0.55lb (251g)
Power Input Interface USB Type-C
RCA Output Level 2V
Power Supply 5V

What‘s in the box?

Item Quantity
Fosi Audio K5 x 1
USB Type-C cable x 1
Optical cable x 1
Headset Microphone Two-in-one Adapter cable x 1
User’s Manual x 1

Compare with similar items:

K4 DAC Headphone Amp with Treble and Bass Control


Worldwide Shipping

1. Overseas warehouse delivery
2. China(Shenzhen) delivery

1. Overseas warehouse delivery

United States, Canada, United Kingdom, Germany, France, Italy, Netherlands, Portugal, Spain, Sweden and Hong Kong, Macau, Taiwan in China are free shipping for you, it needs 1-10 days.

Fast Shipping Free 1-5 days

Note: Some products are out of stock in overseas warehouses, the time limit may be extended by 5-15 days, you can consult customer service in advance, sorry for the convenience. Hong Kong, Macau, Taiwan in China will ship from Shenzhen via 4px.

The United States, shipping to United State via USPS/UPS, which needs about 1-5 days for delivery.

Canada, shipping to Canada via Canadian Post, which needs about 3-5 days for delivery

The United Kingdom, shipping to the United Kingdom via Royal Mail which needs about 3-5 days for delivery.

Italy, shipping to EU Countries via suitable shipping method, which needs about 3-7 days for delivery.

Spain, shipping to EU Countries via Correos to Spain, to other EU Countries via Spain GLS, which needs about 3-5 days for delivery.

2. China(Shenzhen), shipping worldwide via 4px.
if you choose standard shipping, it needs about 15-30 days for delivery.

if you choose fast shipping, we will send it via express shipping for you, which only needs about 7-15 days.

Standard Shipping Free 5-15 days
Fast Shipping $25 3-7 days

All the items you can buy are in stock in a Chinese warehouse, but not all the items are in stock in other warehouses, if you need it urgently shipping from the other warehouse, please confirm it from us first!


Our products are not charged with tax and VAT and we don’t cover with tax amount. We usually help customers to declare the lower price to forbid the tax charged or lower the tax value. And most shipment is not charged with import tax By shipping from the US, EU, RU warehouse to the corresponding countries, there won’t have any tax charged. For some countries that have a complicated custom process like South America, we recommend you order on AliExpress or find a receiver in North America to help you transmit the package.

Note: Faraway address may last longer delivery and add cost.

✓ 30 Days Free Return

Fosi Audio always aims for the highest customer satisfaction. If you are unsatisfied with your products or the products turn out to be defective then you can claim a return or refund.


We afford the return shipping fee with following status:

  1. Defected parts
  2. Damaged devices
  3. Incorrect item shipped


*The 30 days period is calculated from the date you received the items.

*If you claim a return that exceed 30 days free return period or without any defected or damaged devices, you need to afford the return shipping fee yourselves.

*Please note: Some returns we may charge the shipping fee from you. Like change your mind or ordered wrong items when shipping is proceeded, then we will charge the shipping fee from your payments.


Return and refund process

  1. Send your order number and reasons for return and refund via mail to shopify@fosiaudio.com
  2. We will check your case and reply in 2 work days.
  3. If return acceptable then we will distribute the nearest after sale address to you to ship the return.
  4. After you ship the return items, then send the info below to us:
  • tracking number
  • shipping receipt (If shipping fee refund needed)
  • PayPal account (If shipping fee refund needed)
  1. After confirm your package is shipped, we will arrange the refund or replacement as soon as possible.



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Fosi Audio K5 Mini Stereo Gaming DAC HiFi Headphone Amplifier Support Microphone