The 7Hz Sonus II ranks #219 out of 946 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: 7Hz
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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#219 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.
| 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) |
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