HiBy FC4 Headphone Amplifier Portable DAC - HighResolution Mobile DAC

In this review the HiBy FC4 is presented as a compact portable DAC and headphone amplifier for listeners who want a real step up from phone or laptop audio. The bottom line: the FC4 offers a prograde decoding chain in a dongle form factor, with dual ES9219 DACs, support for PCM768kHz and native DSD256, and MQA 16X unfolding, so it is best for listeners who demand high resolution playback and stronger drive for higher impedance earphones without carrying a full digital audio player.

Key Features

• Dual DAC Dual Crystal: Two ES9219 DAC chips plus independent FPGAbased dual crystal reclocking deliver a lower jitter foundation for clearer, more stable decoding.
• High resolution decoding: Native support for PCM up to 768kHz/32bit and DSD256 means the FC4 can reproduce very high resolution files without downsampling.
• MQA 16X unfolding: Full MQA decoding is supported so MQA streams and files can be unfolded up to 16X for higher fidelity playback.
• Professional audio architecture: The internal circuitry mirrors fullsize HiBy players, aiming to preserve micro detail and tonal balance found in lossless sources.
• High driving power: At around 340mW+340mW into 32 ohm, the dongle can drive demanding inear monitors and many fullsize headphones with improved control and dynamics.
• Plug and play: Driverfree operation on Android, iOS, Mac and Windows 10+ makes it easy to add better sound without complex setup.

Who It's For

The FC4 is aimed at audiophiles and serious listeners who use mobile devices or laptops and want a compact way to access higher resolution audio, stronger headphone drive, and MQA decoding without investing in a full digital audio player. It suits owners of high fidelity earphones and portable headphones who need a small, rugged dongle for travel or daily use.

It is less appropriate for casual listeners happy with phone output, or users who require the absolute longest battery life from their host device since some customers report increased power draw. Also, those who need an integrated battery amplifier or Bluetooth playback should look elsewhere.

Pros & Cons

Pros

• Clear, detailed sound driven by dual ES9219 DACs and stable reclocking circuitry.
• Very high resolution support including PCM768k and native DSD256 for advanced formats.
• Strong driving capability to handle many HiFi earphones and some fullsize headphones.
• Convenient plugandplay compatibility with modern Android, iOS, Mac and Windows 10+.

Cons

• Some users report increased power consumption on portable devices, which can shorten battery life.
• Requires a Lightning to TypeC OTG cable for iOS devices, adding a small extra cost for Apple users.

Specifications

DAC chips	Dual ES9219
Decoding	PCM up to 768kHz/32bit, DSD256 native
MQA	Full decoding, up to 16X unfolding
Output power	Approx 340mW + 340mW @32 ohm
Outputs	4.4mm and 3.5mm headphone outputs
Compatibility	Android, iOS, Mac, Windows 10+ (driver for older Windows)

Our Verdict

The HiBy FC4 is a compelling portable DAC/amp for listeners who want professionallevel decoding in a dongle. It combines dual DAC hardware, high resolution and MQA support, and enough drive to satisfy many earphones and headphones, offering strong value for those upgrading from stock phone or laptop audio.

Frequently Asked Questions

Does the FC4 work with iPhones?
The FC4 works with iOS devices but requires a Lightning to TypeC OTG adapter to connect.

Will it drain my phone battery?
Some users report increased power consumption on mobile devices, so expect higher battery use during extended listening sessions.

Is any driver needed?
No driver is required for Android, iOS, Mac and Windows 10 and up; older Windows versions need a driver download.