Short answer: a tie on sound quality. Both are rated 3.6/5 (#691 and #762 of 1291 in-ear headphones) at nearly the same price ($249 vs $249), so choose on features and fit.
The case for 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. The catch: 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.
The case for the ZiiGaat Odyssey 2: Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat. The tradeoff: Presence sits about 5.5 dB low with a 7.2 dB dip near 6.1 kHz, so vocals and instruments lose some bite.
Buy the 7Hz Eternal or the ZiiGaat Odyssey 2 on features: they are rated the same for sound quality at close to the same price.
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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 close to target and holds down to 20 Hz, so low end sounds full without bloat.
Amazon $249.00 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 2 | |
|---|---|---|
| Price | $249.00 | $249.00 |
| Ranked | #691 of 1291 in In-Ear Headphones | #762 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 69 (measured by crinacle, via AutoEQ) | 68 (median of 23 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.63 dB standard deviation | 2.00 dB standard deviation |
| Tonal Tilt | -0.36 (negative is warmer, positive brighter) | -0.74 (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 (-1.1 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 | 20 ohms |
| Sensitivity | 109 dB/1kHz | 105 dB/Vrms |
| Weight | 0 lbs (6 g) per earbud | - |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 20Hz - 25kHz |
| 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 2 from aden, aftersound, arn, atechreviews, audioamigo, awsmdanny, bassaudio, bedrock, cqtek, csi-zone, dl, enemyspider, fernandagunsan, flare, jaytiss, joycesreview, koi, practiphile, pw, silicagel, sl0the, soundcheck39, soundignity and superreview, all via squig.link.
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