Short answer: the 64 Audio Nio. Both are rated 3.1/5 for sound quality (#976 and #962 of 1291 in-ear headphones), and the 64 Audio Nio costs $1,699 against $2,000 for the HIFIMAN RE2000 Pro, with sound quality a draw, the lower price decides it.
Why pick the 64 Audio Nio: A warm, bass-forward tuning with sub-bass about 2 dB and mid-bass about 3 dB above target gives kick drums and bass lines real weight, and the response holds within 6 dB of target all the way down to 20 Hz. The tradeoff: Across 7 hobbyist measurements on squig.link it reaches a preference score of only 63, held back by a 5.8 dB dip near 3.2 kHz and a presence region about 3.4 dB low, which pushes vocals and guitars back and dulls their edge.
What the HIFIMAN RE2000 Pro does well: A single dynamic driver in-ear with a preference score of 63 in crinacle’s measurement, close to the similarly priced 64 Audio U18S in rating. Watch for: Its response deviates about 2.9 dB from target on average, so its tuning is noticeably uneven for the money.
Buy the 64 Audio Nio. Both are rated the same for sound quality, and it costs $301 less than the HIFIMAN RE2000 Pro.
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A warm, bass-forward tuning with sub-bass about 2 dB and mid-bass about 3 dB above target gives kick drums and bass lines real weight, and the response holds within 6 dB of target all the way down to 20 Hz.
Bloom Audio $1,699.00 eBay
A single dynamic driver in-ear with a preference score of 63 in crinacle’s measurement, close to the similarly priced 64 Audio U18S in rating.
HIFIMAN $2,000.00 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
| 64 Audio Nio | HIFIMAN RE2000 Pro | |
|---|---|---|
| Price | $1,699.00 | $2,000.00 |
| Ranked | #976 of 1291 in In-Ear Headphones | #962 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 63 (median of 7 squig.link measurements, calibrated to AutoEQ) | 63 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.51 dB standard deviation | 2.90 dB standard deviation |
| Tonal Tilt | -1.01 (negative is warmer, positive brighter) | -0.49 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.0 dB at 30 Hz) | - |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 8 balanced armature) | Dynamic |
| Drivers | 1 x 9mm dynamic + 8 x balanced armature | - |
| Impedance | 6 ohms | 60 ohms |
| Sensitivity | 108 dB/mW | 103 dB |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 5Hz - 20kHz (Manufacturer specified) |
| Built-in Microphone | - | No |
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