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USB-C DONGLE · ESS ES9219 × 2

HiBy FC4

A USB-C dongle with two ESS ES9219 DAC chips, a 3.5 mm and a 4.4 mm balanced output. Weight 21.7 g.

Manufacturer page · Price history

POWER AT 32 Ω340mW4.4 mm balanced
OUTPUT IMPEDANCENot statedNo data from the manufacturer
SNRNot statedNo data from the manufacturer
PRICE$49Lowest price at HiBy store
OUTPUTS3.5 mm · 4.4 mm balanced
DAC CHIPESS ES9219 × 2
PARAMETRIC EQYesas HiBy states it
CONTOURNot supported

Numbers are the manufacturer's stated figures unless marked as measured; sources linked below.

Outputs and power

4.4 mm balanced
340mWat 32 Ω per channel
FC4 original audio componentry: 340 mW
Output impedance -
3.5 mm
110mWat 32 Ω
Spec sheet: 110 mW at 32 Ω, per channel or both channels not stated
Output impedance -

Not stated: gain, supply voltage, SNR, distortion, crosstalk.

Is it enough for your headphones?

HiBy rates the FC4 at 340 mW into 32 Ω from the 4.4 mm balanced output. Below is how much of that is left to spare for each kind of headphones when you listen loud, with peaks at 110 dB. A figure marked est. is worked out from that rating.

Sensitive IEMsMulti-driver sets that hiss on strong sources
needs 0.6 mWest. 170 mW at 16 Ω+24 dB
Most IEMsTypical in-ears, 16 to 50 Ω
needs 3.2 mW340 mW at 32 Ω+20 dB
Easy-to-drive headphonesClosed and portable, 32 Ω
needs 16 mW340 mW at 32 Ω+13 dB
Hard-to-drive headphones300 Ω, HD 600 class, hungry for voltage
needs 20 mWest. 36 mW at 300 Ω+3 dB
Most planarsPlanar magnetic, low impedance, need current
needs 50 mW340 mW at 32 Ω+8 dB
Demanding planarsThe hardest loads, desktop territory
needs 251 mWest. 181 mW at 60 Ω1 dB short

Where to buy

Some shop links are affiliate links: if you buy through one, I may earn a commission. Your price and the order stay the same.

HiBy store · official store price, checked 16 Oct 2026$49The HiFi Cat · read 11 Nov 2026$79

Price historyCompare prices on Soundblooms Deals

The device

From HiBy's spec sheet unless marked
InputUSB-C
FormatsPCM up to 32-bit / 768 kHz, DSD256
DAC chipESS ES9219 × 2
Volume30 stepsFC4 original audio componentry
Parametric EQSupported in HiBy's HiByUSBMaster app. Not supported in Contour.guide.hiby.com
Size65.3 × 22.1 × 11.9 mm
Weight21.7 g

How it stacks up against the competition

Power at 32 Ω · price in US dollars
200 mW500 mW$30$50$70scale breaks hereMost IEMs need 3.2 mW+20 dB to spareFiiO KA13: 550 mW at 32 Ω, $65.99KA13FiiO KA11: 200 mW at 32 Ω, $29.99Questyle M12i: 21 mW at 32 Ω, $49MOONDROP DAWN 4.4: 230 mW at 32 Ω, $69.99TANCHJIM SPACE LITE: 98 mW at 32 Ω, $39.99FiiO KA1: 45 mW at 32 Ω, $59.99FiiO KA2: 153 mW at 32 Ω, $34.59Snowsky Melody: 250 mW at 32 Ω, $39.99MelodyiBasso DC03PRO: 98 mW at 32 Ω, $69iBasso DC05: 93 mW at 32 Ω, $69Hidizs S3 PRO: 55 mW at 32 Ω, $39.99Hidizs S9: 125 mW at 32 Ω, $49.99Hidizs S9 PRO: 200 mW at 32 Ω, $65.99Hidizs S9 Pro Plus Martha: 180 mW at 32 Ω, $65.99Hidizs S8 Pro Robin: 160 mW at 32 Ω, $59.99Hidizs SD2: 70 mW at 32 Ω, $35.99Hidizs XO: 195 mW at 32 Ω, $40.99MOONDROP DAWN PRO 2: 62 mW at 32 Ω, $59.99TempoTec Sonata BHD Pro: 280 mW at 32 Ω, $59.90TempoTec Sonata HD III: 70 mW at 32 Ω, $45.90HiBy FC3: 70 mW at 32 Ω, $39iFi GO link: 70 mW at 32 Ω, $59iFi GO link Max: 241 mW at 32 Ω, $79CrinEar Protocol Max: 300 mW at 32 Ω, $76.49 (lowest offer on /deals today)TRN Black Pearl: 320 mW at 32 Ω, $31.44 (lowest offer on /deals today)Black PearlJCALLY AP6: 440 mW at 32 Ω, $39.99AP6JCALLY AP7: 70 mW at 32 Ω, ~$45.73JCALLY Galaxy SONATA: 560 mW at 32 Ω, $79.99JCALLY JM20: 31.3 mW at 32 Ω, ~$31.64JCALLY JM20 PRO: 31.3 mW at 32 Ω, ~$35.46JCALLY JM20MAX: 195 mW at 32 Ω, $29.99JCALLY JM30PRO: 31.3 mW at 32 Ω, ~$46.49JCALLY JM45L: 20 mW at 32 Ω, ~$28.45JCALLY JM80E: 45 mW at 32 Ω, $39JCALLY JM98MAX: 195 mW at 32 Ω, $34.99JCALLY SP30: 31.3 mW at 32 Ω, ~$54.61NiceHCK NK1 Ultra: 122 mW at 32 Ω, $29.99NiceHCK PureAural: 210 mW at 32 Ω, $59.99HiBy FC4200 mW500 mW100 mW$30$50$70scale breaks hereMost IEMs need 3.2 mW+20 dB to spareFiiO KA13: 550 mW at 32 Ω, $65.99KA13FiiO KA11: 200 mW at 32 Ω, $29.99Questyle M12i: 21 mW at 32 Ω, $49MOONDROP DAWN 4.4: 230 mW at 32 Ω, $69.99DAWN 4.4TANCHJIM SPACE LITE: 98 mW at 32 Ω, $39.99FiiO KA1: 45 mW at 32 Ω, $59.99FiiO KA2: 153 mW at 32 Ω, $34.59Snowsky Melody: 250 mW at 32 Ω, $39.99MelodyiBasso DC03PRO: 98 mW at 32 Ω, $69iBasso DC05: 93 mW at 32 Ω, $69Hidizs S3 PRO: 55 mW at 32 Ω, $39.99Hidizs S9: 125 mW at 32 Ω, $49.99Hidizs S9 PRO: 200 mW at 32 Ω, $65.99Hidizs S9 Pro Plus Martha: 180 mW at 32 Ω, $65.99Hidizs S8 Pro Robin: 160 mW at 32 Ω, $59.99Hidizs SD2: 70 mW at 32 Ω, $35.99Hidizs XO: 195 mW at 32 Ω, $40.99XOMOONDROP DAWN PRO 2: 62 mW at 32 Ω, $59.99TempoTec Sonata BHD Pro: 280 mW at 32 Ω, $59.90Sonata BHD ProTempoTec Sonata HD III: 70 mW at 32 Ω, $45.90HiBy FC3: 70 mW at 32 Ω, $39iFi GO link: 70 mW at 32 Ω, $59iFi GO link Max: 241 mW at 32 Ω, $79GO link MaxCrinEar Protocol Max: 300 mW at 32 Ω, $76.49 (lowest offer on /deals today)Protocol MaxTRN Black Pearl: 320 mW at 32 Ω, $31.44 (lowest offer on /deals today)Black PearlJCALLY AP6: 440 mW at 32 Ω, $39.99AP6JCALLY AP7: 70 mW at 32 Ω, ~$45.73JCALLY Galaxy SONATA: 560 mW at 32 Ω, $79.99JCALLY JM20: 31.3 mW at 32 Ω, ~$31.64JCALLY JM20 PRO: 31.3 mW at 32 Ω, ~$35.46JCALLY JM20MAX: 195 mW at 32 Ω, $29.99JCALLY JM30PRO: 31.3 mW at 32 Ω, ~$46.49JCALLY JM45L: 20 mW at 32 Ω, ~$28.45JCALLY JM80E: 45 mW at 32 Ω, $39JCALLY JM98MAX: 195 mW at 32 Ω, $34.99JCALLY SP30: 31.3 mW at 32 Ω, ~$54.61NiceHCK NK1 Ultra: 122 mW at 32 Ω, $29.99NiceHCK PureAural: 210 mW at 32 Ω, $59.99PureAuralHiBy FC4
  • Nearby
  • Same DAC chip
  • Most IEMs, 3.2 mW

Devices with the same DAC chip

ES9219 · 7 devices use it
HidizsXO195 mWNo$40.99195 mW · $40.99PEQ No
iFiGO link70 mW$5970 mW · $59
iBassoDC0593 mW$6993 mW · $69
iFiGO link Max241 mW0.35 Ω$79241 mW · 0.35 Ω · $79
iBassoDC06320 mW$119320 mW · $119
iBassoDC06PRO320 mW$119320 mW · $119

All 7 in the finder

Compared with

Manufacturers' stated figures; the price is today's lowest

HiBy FC4 vs HiBy FC3

At 32 Ω HiBy FC4 is listed at 340 mW and HiBy FC3 at 70 mW; the lowest prices are $49 and $39, $10 apart.

HiBy FC4 vs HiBy FC3: the manufacturers' stated figures and today's lowest price, side by side
HiBy FC4HiBy FC3
Power at 32 Ω340 mW4.4 mm balanced70 mW3.5 mm, printed 70+70mW, socket not printed; the only headphone output
Price today$49HiBy store, 16 Oct$39HiBy store, 16 Oct
DAC chipESS ES9219 × 2ESS ES9281PRO
InputsUSB-CUSB-C
Outputs3.5 mm · 4.4 mm balanced3.5 mm
Size65.3 × 22.1 × 11.9 mm45 × 13 × 9 mm
Weight21.7 g9.1 g

HiBy FC4 price history · HiBy FC3 price history

More like this

More portable DAC amps

Sources

Checked 14 Oct 2026
FC4 original specifications
hiby.com · the spec sheet
Used for power, output voltage, formats, the DAC chip, input, outputs, size and weight
FC4 original audio componentry
hiby.com
Used for power, controls and charging required