Short answer: the 7Hz Sonus. Both are rated 4.2/5 for sound quality (#239 and #219 of 946 in-ear headphones), and the 7Hz Sonus costs $59.99 against $79.99 for the 7Hz Sonus II, so with nothing between them on sound quality, price settles it.
Why pick the 7Hz Sonus: The median of 27 hobbyist measurements gives it a very good Harman preference score of 76 with a 1.77 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural. Watch for: Presence sits about 3.3 dB low with a 6.2 dB dip near 6.3 kHz, so vocals and instruments lose some bite.
The case for the 7Hz Sonus II: Squig.link hobbyist measurements give it a preference score of 76.5 with a smooth 1.7 dB deviation, and bass through the low mids sits within half a decibel of target, so kick drums, bass lines and voices come through full and natural. The tradeoff: The 3 to 6 kHz presence range sits nearly 4 dB under target with a 5.2 dB dip near 6 kHz, so vocals and guitars can sound a little distant and less crisp.
Buy the 7Hz Sonus. Both are rated the same for sound quality, and it costs $20 less than the 7Hz Sonus II.
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Specifications Side By Side
| 7Hz Sonus | 7Hz Sonus II | |
|---|---|---|
| Price | $59.99 | $79.99 |
| Ranked | #239 of 946 in In-Ear Headphones | #219 of 946 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 76 (median of 27 squig.link measurements, calibrated to AutoEQ) | 77 (median of 2 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.77 dB standard deviation | 1.66 dB standard deviation |
| Tonal Tilt | -0.37 (negative is warmer, positive brighter) | -0.45 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.3 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature) | Hybrid (1 dynamic + 1 planar magnetic) |
| Drivers | 1 x dynamic + 1 x balanced armature | 1 x dynamic + 1 x planar magnetic |
| Impedance | 30 ohms | 29 ohms |
| Sensitivity | 109 dB/V | 108 dB/V |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 10Hz - 20kHz (Manufacturer specified) |
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Prices on this page were last checked October 13, 2026 at 3:17 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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The Two Headphones In Full
7Hz Sonus: $59.99 Amazon $59.99 eBay
Pros: The median of 27 hobbyist measurements gives it a very good Harman preference score of 76 with a 1.77 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural. Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat. It uses 1 x dynamic + 1 x balanced armature with an easy 30 ohm load.
Cons: Presence sits about 3.3 dB low with a 6.2 dB dip near 6.3 kHz, so vocals and instruments lose some bite. A 6.6 dB peak near 11.5 kHz can make cymbals and sibilance sound sharp.
Full 7Hz Sonus review and specifications →
| Released | Aug 2023 (3 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.77 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x dynamic + 1 x balanced armature |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 76 (median of 27 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 30 ohms |
| Sensitivity | 109 dB/V |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.4 dB at 30 Hz) |
| Tonal Tilt | -0.37 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
7Hz Sonus II: $79.99 Amazon $79.99 eBay
Pros: Squig.link hobbyist measurements give it a preference score of 76.5 with a smooth 1.7 dB deviation, and bass through the low mids sits within half a decibel of target, so kick drums, bass lines and voices come through full and natural. Sub-bass holds to within 0.3 dB of target at 30 Hz, giving electronic and film music real rumble. The hybrid of one dynamic and one planar driver runs easily from a phone at 29 ohms and 108 dB/V, and its slightly warm balance suits listeners who like a relaxed sound.
Cons: The 3 to 6 kHz presence range sits nearly 4 dB under target with a 5.2 dB dip near 6 kHz, so vocals and guitars can sound a little distant and less crisp. A 3.2 dB bump near 8.1 kHz then adds a touch of sharpness to cymbals right above that dip.
Full 7Hz Sonus II review and specifications →
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 1.66 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 1 planar magnetic) |
| Drivers | 1 x dynamic + 1 x planar magnetic |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 77 (median of 2 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 29 ohms |
| Sensitivity | 108 dB/V |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.3 dB at 30 Hz) |
| Tonal Tilt | -0.45 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples