Short answer: the ZiiGaat Odyssey. Both are rated 3.6/5 for sound quality (#700 and #691 of 1291 in-ear headphones), and the ZiiGaat Odyssey costs $229 against $249 for the 7Hz Eternal, so with nothing between them on sound quality, price settles it.
Why pick the 7Hz Eternal: Crinacle’s measurement gives it a preference score of 69, and squig.link measurements show bass, mids and upper mids all within about 1 dB of target, so voices and instruments sound natural. Watch for: Treble above 6 kHz drops 3 to 4 dB below target with an 8.7 dB dip near 10.6 kHz, so cymbals lack sparkle and detail sounds dim.
What the ZiiGaat Odyssey does well: Bass sits right on target with good extension, and the warm tuning measured by 25 people is smooth and fatigue free. Watch for: The 1 to 3 kHz region is about 3 dB low and presence about 6 dB low, with a 6.6 dB dip near 3.9 kHz, so vocals lack presence and clarity.
Buy the ZiiGaat Odyssey. Both are rated the same for sound quality, and it costs $20 less than the 7Hz Eternal.
Looking for alternatives? See the complete Headphones rankings.
Crinacle’s measurement gives it a preference score of 69, and squig.link measurements show bass, mids and upper mids all within about 1 dB of target, so voices and instruments sound natural.
Linsoul $249.00 eBay
Bass sits right on target with good extension, and the warm tuning measured by 25 people is smooth and fatigue free.
Amazon $229.00 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
| 7Hz Eternal | ZiiGaat Odyssey | |
|---|---|---|
| Price | $249.00 | $229.00 |
| Ranked | #691 of 1291 in In-Ear Headphones | #700 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 69 (measured by crinacle, via AutoEQ) | 69 (median of 25 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.63 dB standard deviation | 2.14 dB standard deviation |
| Tonal Tilt | -0.36 (negative is warmer, positive brighter) | -0.65 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.0 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.3 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid |
| Drivers | 1 x 14.5mm dynamic | 1 x 10mm dynamic + 3 x balanced armature |
| Impedance | 30 ohms | 18 ohms |
| Sensitivity | 109 dB/1kHz | 104 dB/mW |
| Weight | 0 lbs (6 g) per earbud | - |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 20Hz - 23kHz (Manufacturer specified) |
| Built-in Microphone | No | - |
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 Eternal from audioamigo, bedrock, dchpgall, dl, harpo, hbb, iemworld, musicafe, precog, vortexreviews and vsg; the ZiiGaat Odyssey from aden, aftersound, atechreviews, audioamigo, bassaudio, bloomaudio, dl, eliseaudio, fernandagunsan, flare, isaiahse, jaytiss, joycesreview, koi, kuping-sensi, lown-fi, obodio, practiphile, pw, sl0the, soundcheck39, soundignity, superreview, timmyv and tonedeafmonk, all via squig.link.
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