Short answer: a tie on sound quality. Both are rated 3.9/5 (#515 and #512 of 1291 in-ear headphones) at nearly the same price ($79.99 vs $83.99), so choose on features and fit.
Why pick the EarFun Air Pro 4: The median of 5 hobbyist measurements gives it a solid Harman preference score of 72 with a 1.98 dB spread, and its mids sit within about 0.7 dB of target, so vocals and instruments sound natural. The catch: Its 1.98 dB spread is less even than the best measured sets.
The case for the Hidizs MS2 Pro: The median of 7 hobbyist measurements gives it a solid Harman preference score of 72 with a 2.12 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural. Watch for: A 7.7 dB peak near 8.2 kHz can make cymbals and sibilance sound sharp.
Buy the EarFun Air Pro 4 or the Hidizs MS2 Pro on features: they are rated the same for sound quality at close to the same price.
Still deciding? The full Headphones rankings cover every ranked option.
The median of 5 hobbyist measurements gives it a solid Harman preference score of 72 with a 1.98 dB spread, and its mids sit within about 0.7 dB of target, so vocals and instruments sound natural.
Amazon $79.99 eBay
The median of 7 hobbyist measurements gives it a solid Harman preference score of 72 with a 2.12 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural.
Amazon $83.99 eBayPrices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| EarFun Air Pro 4 | Hidizs MS2 Pro | |
|---|---|---|
| Price | $79.99 | $83.99 |
| Ranked | #515 of 1291 in In-Ear Headphones | #512 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 72 (median of 5 squig.link measurements, calibrated to AutoEQ) | 72 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.98 dB standard deviation | 2.12 dB standard deviation |
| Tonal Tilt | -0.73 (negative is warmer, positive brighter) | -0.38 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.6 dB at 30 Hz) |
| Connection | True wireless | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x 10mm dynamic | 1 x 10.2mm dynamic + 1 x balanced armature |
| Active Noise Cancelling | Yes | - |
| Battery Life | 11 hours (52 with case, Manufacturer specified) | - |
| Bluetooth Version | 5.4 | - |
| Bluetooth Codecs | SBC, AAC, aptX, aptX Lossless, LDAC | - |
| Built-in Microphone | Yes | No |
| IP Rating | IPX5 | - |
| Impedance | - | 17 ohms |
| Sensitivity | - | 111 dB |
| Frequency Response | - | 20Hz - 40kHz (Manufacturer specified) |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the EarFun Air Pro 4 from atechreviews, dhrme, fernandagunsan, regancipher and soundignity; the Hidizs MS2 Pro from audioamigo, digaoreviews, joycesreview, soundcheck39, soundignity, tdl and treblewellxtended, all via squig.link.
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