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7Hz Eternal IEMs – Timeless Music Playing Now

7Hz Eternal IEMs – Timeless Music Playing Now



7Hz Eternal is an upper midrange IEM or In-Ear Monitor sold mainly on Linsoul, priced at 249 USD, with a huge 14.5mm dynamic driver, and which will be compared to other high quality IEMs such as FiiO FD5 (300 USD), Dunu Falcon PRO (220 USD), and ddHIFI Janus E2020A (250 USD). 







7Hz is a company that’s been carefully grown under the tutorship of Linsoul, and their products are mainly sold on Linsoul’s official website, as well as Amazon. Their original IEM release, Timeless has received high praise for its superb accuracy and detailing, and entry-level pricing, along with the strong support from Linsoul. Generally speaking, 7Hz is going to receive super good support from Linsoul and it is an awesome company to order from, or rather a brand, since you’re almost always ordering from Linsoul, even when using Amazon. 



If you’ve been wondering what I do for my daytime job, please check out Seventh Heart Studios, and our upcoming project, Eternal Hour, which has an entire sequel available for free on Steam. I added this little bit of information because 7Hz eternal feels like a stab’s been taken on the fact that my company is named Seventh Heart Studios, and our main project Eternal Hour, despite us not having any further connection to 7Hz or Linsoul


It should be noted that I have absolutely no affiliation with 7Hz or Linsoul, I am not receiving any incentive for this review or to sweeten things out. I’d like to thank Linsoul for providing the sample for this review. Every opinion expressed is mine and I stand by it. The purpose of this review is to help those interested in 7Hz timeless find their next music companion. 




Product Link


You can grab one from www.amazon.com here: https://amzn.to/3PcNJWI


If you’re in the UK, you can grab one from www.amazon.co.uk here: https://amzn.to/3kUdZHx


And if you’re from Europe, you can grab one from www.amazon.de here: https://amzn.to/3FwKe94






First things first, let’s get the packaging out of the way:




We have a rich package once again, and 7Hz is a brand that’s always satisfying to unbox and experiment. In the package, we have 

  • 7Hz Eternal IEMs
  • Cable
  • Metallic carrying case, copper colored
  • 4 types of tips included in 3 sizes each, for a total of 22 eartips included with the eternal
  • Warranty card
  • Instructions manual
  • Quality control kit






Build Quality/Aesthetics/Fit/Comfort


We have a really nice build quality with the Eternal, and this starts at the case, which is a solid, heavy case made of metal, and offers extreme protection for the IEMs. It feels like the company knew something about the state of the world we live in right now, and wanted to prepare those IEMs to survive for any kind of weather, including our post apocalyptic, post nuclear winter morning jog. The IEMs are also super solid, and although it may look like it, the driver is not exactly what you’re seeing on the faceplate of the IEMS while looking at them. 



The 7Hz Eternal IEMs are a deep red copper in color, and made of aluminum, with a large disc shaped, transparent faceplate that resembles an audio driver. This faceplate is coated in sapphire, and made of optical-grade glass, which makes it very resistant to scratches, and good for long term usage. Also extremely beautiful, to the point where they were favored above all of the 2022 Spring IEMs for photos by our artist who really took a liking to the jewel-like design of the Eternal. 


The cable of Eternal is detachable and based on an MMCX connector, slightly springy and slightly tangle prone, also a deep red – copper color, and ended in a 3.5mm termination. Since the wearing style is over-the-ear, Eternal has a good fit for me, with no cable microphonics, and no noise. 7Hz Eternal is fairly good at rejecting noise from sources, being resistant to source hissing, though it has a fairly low impedance of 30 OHMs. Speaking of source pairing, Eternal has a SPL of 109 dB, which is fairly high, making Eternal easy to drive. Weighting about 6 grams for each earpiece, Eternal is not very heavy, and wearing it is a pleasure. 



In fact, although I’ve seen some users complaining of driver flex, I got none, and I’m really sensitive to it. Eternal isolates quite well from the outside noise, offering between 20 and 25 dB of passive noise isolation, as even with very quiet music I’m unable to hear my own typing or the sound of my computer in the background. The tips offer a shallow-medium fit, which works well for my ears, and I’d grade 7Hz Eternal as super comfortable, super well made, and easy to drive from modest sources. 




Sound Quality


Speaking of the sources used to power 7Hz Eternal, the big boy star is, as always, Astell & Kern SE180, accompanied by iBasso DX300, Lotoo PAW 6000, and ddHIFI TC44C. It is easy to get 7Hz Eternal going and to get them loud, and they scale nicely with the source, but most midrange sources such as Shanling M3X, or hip-dac2 should do well with Eternal. More entry-level options such as Hifi Walker H2 also pair nicely with Eternal, and it has super good synergy with all DAPs I tested it with, as it doesn’t have a very specific sonic coloration. 7Hz Eternal sounds best at medium and quiet listening volumes; it gets aggressive and V-Shaped at strong volumes, with a somewhat strong peak in the 5-7kHz range. That peak is not noticeable at low listening volumes, and it is generally pleasing, relaxed and smooth. Given that it seems tuned for lower listening volumes, that is the volume at which I’m going to be reviewing it. At high volumes you will notice all the disadvantages that other reviewers have mentioned, including a sharp 5-6kHz peak and a peaky presentation. This being said, this is above a normal / safe listening volume, and it starts to happen from about 100dB, which can be unsafe quickly for your health and hearing, so I recommend avoiding listening to high volumes for long periods of time to protect your health and your hearing. 



The overall signature of the 7Hz Eternal can be described as thick, warm, natural, deep, wide, holographic, relaxed, smooth and fairly detailed. It has excellent dynamics and overall detail, but 7Hz went for a polar opposite signature compared to their original Timeless, which was a detail extractor. Eternal is much smoother, more relaxed, cleaner, and easier to listen to, which can make it seem much less detailed than the original. I was one of those who didn’t want to hear of relaxed signatures years ago, but nowadays I go with the flow and enjoy what’s presented to me, the way it is presented to me. I simply have the mood to relax sometimes, to go with some tea, and to hear a soothing melody, while other days, I just wake up with the desire to annoy everyone and flame everything around me, days like those being the days I enjoy a bright, sharp and brilliant sound with tons of details, like throwing gasoline on the fire of my passion to burn out new ideas in my mind. The bottom line here is that 7Hz Eternal is relaxed and clean, smooth and lean, very different from the analytical, bright and textured presentation that 7Hz Timeless has. 


The bass of 7Hz Eternal is clean, slightly emphasized above neutral, with most of the energy residing in the mid bass – upper bass – lower treble range. The bass is not extremely high in amounts, and sounds mostly natural, clean and well extended, but not overly authoritative. The speed of the bass is natural, and it gives the impression of a naturally played sound, presenting acoustic instruments with a honest amount of substance and low end presence. If you’re looking for a basshead IEM, Eternal can feel a bit too lean and smooth in the bass, but the bass is always present, just not overpowering the rest of the frequencies. 



The midrange of 7Hz Eternal is interesting, because it responds very differently to different volumes. At safe listening volumes at which most readers listen at, the sound is smooth, buttery, relaxed, clean and very detailed. Eternal also has a super nice soundstage, with a huge width, superb depth, and good instrument separation, but it is never analytical, having a natural tonality, and very enjoyable presentation. At loud volumes, the sound can get sharp, and there’s a specific 5-6-7kHz peak that gives the feeling of much stronger impact and edgier detail, but which takes away some of this relaxing presentation that Eternal presents itself with at lower listening volumes. I always try to listen an IEM and Headphone at the volume they sound best at, not because I force myself to do so, but because I naturally adjust the volume to where the best overall sonics are, but if you know you need something loud, and if you like an explosive sound, you can check the 7Hz Timeless, which is designed to be listened louder. 


The treble of 7Hz Eternal is super smooth, clean and very enjoyable. I never knew I enjoyed this kind of sound, but Eternal has really good extension, combined with a low amount of stress and sharpness. It is easy to enjoy it with most music styles, even with Dance Gavin Dance, and you don’t need to adjust to their sound in any way, they simply sound relaxed, clean and natural. The high end detail can be lower than on Timeless, which has a very sparkly and airy treble, but Eternal is really enjoyable just this way, smooth, relaxed, clean and natural. In fact, in this price range, nothing impressed me quite as much with the natural midrange, clean presentation and enjoyable tuning. Just be careful, it can quickly become sharper and hotter if you’re a loud listener. 







7Hz Eternal vs FiiO FD5 (250 USD vs 300 USD) – FD5 has been a long-time favorite for many, but physically it is larger and less comfortable compared to 7Hz Eternal which is considerably easier to wear and more comfy. The cable is better on FD5, as it is modular and can use any connector you require, but the sound is also much more aggressive compared to Eternal, which is much more relaxed. FD5 has a stronger lower bass and a more recessed midrange, with a much stronger treble emphasis and a more sharp, cold sound, Eternal sounding considerably smoother, more relaxed, more natural, wider and deeper, with more substance and presence in the lower midrange and upper bass. Between them, Eternal sounds far more natural, FD5 sounding much more V-Shaped and aggressive. This makes FD5 more revealing and more analytical, Eternal being smoother. 




7Hz Eternal vs Dunu Falcon PRO (250 USD vs 220 USD) – Falcon PRO is similar in size and weight when compared to 7Hz Eternal, but it comes with a modular cable. It should also be sold by Linsoul as well, so there’s no conflict of interests for them if I say that Falcon PRO generally feels more commercial, where Eternal feels more like a boutique IEM that’s heavily specialized. Between them, Eternal has a slightly more relaxed, smoother presentation, with more soundstage width and depth, whereas Falcon PRO has better instrument separation, clarity and definition. Eternal never feels quite as revealing as Falcon PRO, but it feels easier to listen to and enjoy, as well as more relaxing and smoother, making a much easier listen with most music, including rock and metal. The lesson here is simple, if you want a clean, natural sound with a warmer, more relaxed presentation, go for Eternal, while if you’re looking for a more V-Shaped commercial sound with stronger mid bass, more treble energy and consequently more details, go for Falcon PRO which is still an excellent choice. 


7Hz Eternal vs ddHiFi Janus E2020A (250 USD vs 250 USD) – Eternal has a slightly more aesthetic presentation than Janus, although Janus has that dual cable input going on for it. The overall build quality is comparable between them, although Eternal is larger physically and heavier, but also has a better default cable. The sonics are warmer, more natural and more musical on Eternal, and wider, more airy and more bright on Janus, which has slightly more details than Eternal. Both make great options, but I would go with Eternal if you mainly listen to Jazz, Pop, and music where bass is a central element, as it has better bass and depth compared to Janus. 




Value and Conclusion


At the end of the day, just like the original 7Hz Timeless, 7Hz Eternal has superb value for the price paid, but it has a very different sound, focusing on a more natural, lush and smoother signature, with a far more relaxing presentation that will appeal to those wanting a wide, holographic, yet thick and phat sound, rather than detail addicts who want to dissect music. It is interesting that 7Hz would have a 10th anniversary and launch a product that’s good value, but almost polar opposite form their best seller IEM, the Timeless, but it is always good to have what to choose from. 



The package is solid, especially that heavy, thick metallic case, and the huge number of tips included with Eternal. The cable is of a decent quality too, and while deep copper red won’t be everyone’s cup of tea, the faceplates of Eternal are superb, and will appeal to virtually everyone. Even better, the comfort should fit most ears well, despite the round and large 7Hz faceplates designed for Eternal. 



At the end of the day, if you’re looking for a high-end IEM with a super natural midrange, detailed presentation, wide and deep stage, with a phat and thick mid presentation, 7Hz Eternal is perfect and should provide years of uninterrupted fun, for a pocket-friendly price. 




Product Link


You can grab one from www.amazon.com here: https://amzn.to/3PcNJWI


If you’re in the UK, you can grab one from www.amazon.co.uk here: https://amzn.to/3kUdZHx


And if you’re from Europe, you can grab one from www.amazon.de here: https://amzn.to/3FwKe94







— Please remember to stay safe, and always have fun while listening to music!—







Full Playlist used for this review




We listened to more songs than those named in this playlist, but those are excellent for identifying a sonic signature.  PRaT, Texturization, Detail, Resolution, Dynamics, Impact, and overall tonality are all revealed by those songs. We recommend trying most of the songs from this playlist, especially if you’re searching for new music!


If you have a dime to spare (donate), it would make my day much brighter, as it would help me improve things around the website and increase the frequency of my posts.


Youtube Playlist



Tidal Playlist






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1 Comment

  1. Super nice review!

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