Short answer: a tie on sound quality. Both are rated 3.7/5 (#627 and #639 of 1291 in-ear headphones) at nearly the same price ($14.99 vs $13.95), so choose on features and fit.
Why pick the 7Hz Aero: Across eight hobbyist measurements on squig.link it earns a Harman preference score of 70.6 with a smooth 1.97 dB deviation, an unusually even response for such an inexpensive single 9.2mm dynamic earphone. Watch for: The 10 to 16 kHz air region runs about 5.3 dB above target, and a 5.3 dB peak near 8.4 kHz can make cymbals and sibilance a little splashy on bright recordings.
The case for the GK Kunten: The median of 18 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.07 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. Watch for: Presence sits about 4 dB low with a 6.6 dB dip near 5.8 kHz, so vocals and instruments lose some bite.
Buy the 7Hz Aero or the GK Kunten on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Headphones rankings.
Across eight hobbyist measurements on squig.link it earns a Harman preference score of 70.6 with a smooth 1.97 dB deviation, an unusually even response for such an inexpensive single 9.2mm dynamic earphone.
Amazon $14.99 eBay
The median of 18 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.07 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
AliExpress $13.95 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| 7Hz Aero | GK Kunten | |
|---|---|---|
| Price | $14.99 | $13.95 |
| Ranked | #627 of 1291 in In-Ear Headphones | #639 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 71 (median of 8 squig.link measurements, calibrated to AutoEQ) | 70 (median of 18 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.97 dB standard deviation | 2.07 dB standard deviation |
| Tonal Tilt | -0.81 (negative is warmer, positive brighter) | -0.77 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.8 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.8 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 9.2mm dynamic | 1 x 10mm dynamic |
| Impedance | - | 43 ohms |
| Sensitivity | - | 109 dB/mW |
| Frequency Response | - | 20Hz - 40kHz |
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 7Hz Aero from achoreviews, aftersound, bassyalexander, musicafe, pw, silicagel, soundcheck39 and vortexreviews; the GK Kunten from aftersound, ankramutt, audioamigo, bassaudio, boizoff, digaoreviews, dvewlsh, enemyspider, eplv, fernandagunsan, filk, jaytiss, kuping-sensi, obodio, practiphile, sl0the, soundignity and theaudiostore, all via squig.link.
Related Headphone Comparisons
More worthwhile head-to-heads for 7Hz Aero: