Short answer: the 7Hz Legato, though neither ranks well in its class. It ranks #1183 of 1291 in-ear headphones by sound quality, rated 1.8/5, at $109. The HIFIMAN RE600S ranks #1208, rated 1.5/5, at $75.46, $33.54 cheaper, a saving that is not big enough to make up the sound-quality gap. Both are rated below 3.0/5 among the 1291 in-ear headphones, and the Intuaura Reference 2019, ranked #7 at $34.99, is a better place to start if sound quality matters.
The 7Hz Legato is the better-sounding choice. Bass is lifted about 5.1 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. The tradeoff: Presence sits about 5.2 dB low with a 6.8 dB dip near 4.3 kHz, so vocals and instruments lose some bite.
The case for the HIFIMAN RE600S: At 16 ohms and 102 dB/mW a phone drives it easily, and the single 8.5mm dynamic driver keeps the design simple. The catch: In oratory1990’s measurement bass falls 6 dB below target by 95 Hz and is about 11 dB down at 30 Hz, so music sounds thin, while presence and air sit roughly 10 to 12 dB below target with a 13.4 dB dip near 11.9 kHz.
Buy the 7Hz Legato. It is rated higher for sound quality, and the $33.54 you would save on the HIFIMAN RE600S does not close the gap.
Still deciding? The full Headphones rankings cover every ranked option.
Bass is lifted about 5.1 dB with extension to 20 Hz, giving kick drums and bass lines extra weight.
Linsoul $109 eBay
At 16 ohms and 102 dB/mW a phone drives it easily, and the single 8.5mm dynamic driver keeps the design simple.
Amazon $75.46 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
| 7Hz Legato | HIFIMAN RE600S | |
|---|---|---|
| Price | $109 | $75.46 |
| Ranked | #1183 of 1291 in In-Ear Headphones | #1208 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 12mm dynamic + 1 x 6mm dynamic | 1 x 8.5mm dynamic |
| Impedance | 26 ohms | 16 ohms |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 15Hz - 22kHz (Manufacturer specified) |
| Harman Preference Score | 47 (median of 25 squig.link measurements, calibrated to AutoEQ) | 43 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 3.63 dB standard deviation | 4.42 dB standard deviation |
| Tonal Tilt | -1.61 (negative is warmer, positive brighter) | +0.02 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+4.6 dB at 30 Hz) | Falls 6 dB below target at 95 Hz (-11.1 dB at 30 Hz) |
| Sensitivity | - | 102 dB/mW |
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