amazon
82Score and link only; this publisher does not allow quotes.
Read the full review
Image © AmazonHarmonicdyne Poseidon
At a glance
- Brand
- Harmonicdyne
- Type
- Over-Ear
- Fit
- open
- Connection
- Wired
- Noise cancelling
- -
- Released
- 2021
Score breakdowngood overall
Sound7.8
Value4.2
The HearWiki takeAI-condensed
The Harmonicdyne Poseidon is a wired, open-back over-ear headphone featuring a 50 mm nickel-coated dynamic driver aimed at delivering clear, low-distortion sound with a neutral signature. Its 64-ohm impedance and 103 dB sensitivity allow it to work well with portable sources, while the detachable cable and included balanced option add versatility. With a solid build, comfortable fit, and generous accessories, it presents strong value in its price range.
What works
- Clean, neutral sound with high clarity
- Sturdy and attractive open-back construction
- Comfortable fit for extended listening
- Includes balanced and single-ended cables
- Good value for the price
What doesn't
- Open-back design leaks sound and lets in noise
- Requires some power for optimal performance
- Limited to wired connection only
Paraphrased from published reviews & specs - not an original hands-on test. Our AI disclosure.
Specifications
| Driver | 50 mm dynamic |
|---|---|
| Driver type | dynamic |
| Driver size | 50 mm |
| Drivers per side | 1 |
| Frequency response | 10 Hz - 40 kHz |
| Sound signature | neutral |
| Impedance | 64 Ω |
| Sensitivity | 103 dB/mW |
Audio
| Driver | 50 mm dynamic |
|---|---|
| Driver type | dynamic |
| Driver size | 50 mm |
| Drivers per side | 1 |
| Frequency response | 10 Hz - 40 kHz |
| Sound signature | neutral |
| Impedance | 64 Ω |
| Sensitivity | 103 dB/mW |
Design
| Weight | 380 g |
|---|---|
| Detachable cable | Yes |
| USB-C | No |
| Connector | 6.35 mm |
| Balanced connection | Yes |
Where to buy
Retailers we matched to this exact model. Prices are periodic snapshots - the link always opens the retailer's current listing.
What the reviews said
6 source(s) feeding this product's score.
What YouTube reviewers say
Video reviews we found, each condensed to its verdict. They do feed the HearWiki score, at a measured weight below what a published written review carries.
10:05Harmonicdyne POSEIDON (vs ZEUS) - REVIEW
The reviewer finds the Harmonicdyne Poseidon to be a warm, detailed headphone that excels with live and chamber music, but notes it has significant sub-bass roll-off and a less neutral tuning compared to its sibling, the Zeus. It is easy to drive and comfortable, though the stock cable is poor. The reviewer concludes it's a great choice for those who love a very warm sound with good detail, but not for those seeking neutrality.
MixedWatch on YouTube
30:27HarmonicDyne Poseidon Headphone - Do NOT believe the marketing!
The reviewer finds the HarmonicDyne Poseidon to be a well-built and attractive headphone with an upgraded sound over the Zeus, offering spacious and clear audio despite a colored, warm tuning. However, he cautions that the marketing makes exaggerated claims about performance and neutrality, and the design changes are mostly cosmetic. Overall, he sees it as a good value, especially at the early-bird price, but not a reference-grade product.
MixedWatch on YouTube
20:29Back this Kickstarter While You Can! HarmonicDyne Poseidon Review - Brother of Zeus
The reviewer highly recommends the HarmonicDyne Poseidon, calling it his new favorite 'Goldilocks' headphone for its balanced yet warm and detailed sound. He praises its build quality, comfort, and versatility, noting it performs well across various genres and sources. He suggests backing the Kickstarter early for a good price.
PositiveWatch on YouTube
11:12HarmonicDyne Poseidon Review - Zeus is better
The reviewer finds the HarmonicDyne Poseidon to be a step down from the Zeus, with poor bass tuning that is muddy and bloated, and overall technical performance that is compressed and less clear. While the design is improved and it is easy to drive, the sound quality does not justify its price, and the reviewer does not recommend it over the Zeus or other competitors like the Hifiman Sundara or Sennheiser HD650.
NegativeWatch on YouTube
Summaries are AI condensations of each video's own conclusion, not transcripts. Titles, thumbnails and view counts belong to their channels.
Own these? Rate them.
A minute of your experience with the Harmonicdyne Poseidon helps the next person shopping for them.
Alternatives in the $170–$670 range
Other over-ear models at a comparable price, ordered by HearWiki score.
More from Harmonicdyne
Other Harmonicdyne models in the database, same category first.
Where it sits in our rankings
The data-driven guides this model qualifies for.