Close Menu
stereoguide.com
  • Home
  • Bluetooth Speakers
    • Home/Indoor
    • Mobile/Outdoor
    • Stereo Speaker Sets
    • Bluetooth Speaker Ranking
  • Headphones
    • In-Ears
    • On-Ear/Over-Ear
    • Noise-Cancelling
    • True Wireless
    • Gaming Headsets
    • Mobile headphone DACs
    • Home headphone amplifiers
    • Mobile digital audio players
    • Headphones Ranking
  • Hi-Fi
    • WIFI Onebox
    • WIFI Stereo
    • Soundbars
    • Subwoofers
    • Turntables
    • Hi-Fi Ranking
  • Car-Hi-Fi
    • Car Hi-Fi reviews
    • Car-Hi-Fi reports
    • Car Hi-Fi Ranking
  • Guides
    • News
    • Buying Guides
    • Technology
    • Acoustics
    • Streaming
  • About us
    • Our approach
    • About us
  • English
    • German
Facebook Instagram RSS YouTube TikTok
YouTube Facebook Instagram TikTok LinkedIn
stereoguide.com
  • Home
  • Bluetooth Speakers
    • Home/Indoor
    • Mobile/Outdoor
    • Stereo Speaker Sets
    • Bluetooth Speaker Ranking
  • Headphones
    • In-Ears
    • On-Ear/Over-Ear
    • Noise-Cancelling
    • True Wireless
    • Gaming Headsets
    • Mobile headphone DACs
    • Home headphone amplifiers
    • Mobile digital audio players
    • Headphones Ranking
  • Hi-Fi
    • WIFI Onebox
    • WIFI Stereo
    • Soundbars
    • Subwoofers
    • Turntables
    • Hi-Fi Ranking
  • Car-Hi-Fi
    • Car Hi-Fi reviews
    • Car-Hi-Fi reports
    • Car Hi-Fi Ranking
  • Guides
    • News
    • Buying Guides
    • Technology
    • Acoustics
    • Streaming
  • About us
    • Our approach
    • About us
  • English
    • German
stereoguide.com
Home » Headphones » In-Ears » Acoustune HS1750Cu review
In-Ears

Acoustune HS1750Cu review

Tradition and Sci-Fi - a true story about IEMs
Stereo GuideStereo Guide8. September 2023
Facebook Twitter Pinterest WhatsApp Email
Review: In Ear Monitors Acoustune HS1750Cu
The aluminum enclosures of the Acoustune HS1750Cu are a work of art in themselves (Photo: Stereo Guide)

STEREO GUIDE verdict

92%
92%
Highlight

+ ultra transparent, high resolution
+ insane grippy speed and fine dynamics
+ deep, powerful yet fast bass
+ well adjustable, very comfortable fit
- mercilessly transparent for vintage recordings
- Capsules protrude far from the ear

  • Sound: tonal balance / transparency
    9.5
  • Sound: Bass / Dynamics
    9.4
  • Ease-of-use / Connectivity
    9
  • Price / Performance
    9

The last decade saw new headphone brands spring up like mushrooms after listening to music became an important thing after the rise of iPods and smartphones. That might be one reason why Japanese manufacture Acoustune appearing on the market in 2013 went mostly unnoticed. In Japan they are mostly famous for more or less expensive passive in-ear monitors. And the hype was all about Bluetooth, True Wireless and noise-canceling, was it not? So anyways, the new Acoustune HS1750Cu, which we had the chance to review after they were introduced to the European market, is anyways a pretty special product.

The elaborate construction and the unique, technology-driven design also play their part. Because the IEMs, which are handcrafted in Japan, are by no means inconspicuous. Even the HS1750Cu model, which represents something like the entry into Acoustune´s high-end league coming in at an ambitious retail price of 700 bucks. One might think these wired things in your ears evolve directly from some science fiction cartoon. And if you happen to read the specs and technical whitepaper of their diaphragm structure and choice of materials, you might think we are dealing with high-end loudspeakers.

The technology is in the material

While other high-end in-ears try to justify their four-digit price tags with electrostatic tweeters, a whole bunch of drivers and crossover filter, Acoustune declare a pretty down-to earth electrodynamic full-range transducer to be their preferred choice in terms of maximizing sound quality.

Thus, the HS1750Cu also contains a single dynamic driver unit with a 10 mm diaphragm. However, this one has it all in the truest sense of the word: Acoustune use an exclusive called Myrinx. This is said to be a special polymer of the type used in the medical field, for example during operations to replace human membranes. The transducer itself is designed to combine the precision and long-term stability of high-tech materials with some bionic touch of a human eardrum´s principle. And eardrum is exactly what “Myrinx” translates to.

But the quest for special material science does not end there: The developers are convinced that shape and material of the enclosure behind the diaphragm have a decisive influence on the sound character. The addition of “Cu” in the product name HS1750Cu stands for copper and is intended to provide maximum bass power and impulse accuracy in the lower frequency range. In fact, the entire inner volume is made of some brass-like solid copper alloy.

A new level of manufacturing

However, such an alloy, in turn, is not suitable for making the entire in-ear-monitor from it. Therefore, Acoustune´s developers unceremoniously designed a two-part outer casing made of aluminum. It is created in-house at Acoustune´s factory from the solid aluminum block using ultra-high precision CNC milling. The ingenious design ensures that it clamps the inner capsule without influencing it acoustically. This is also the reason for the somewhat science fiction-like look of the overall construction. From some perspectives, the design even resembles an engine.

So we should talk about efficiency: Despite their rather modest impedance of 24 ohms, the Acoustune S1750Cu are among the loudest in-ears we have tested so far. Even at the dynamically limited output jack of modern smartphones max SPL itself was pretty satisfying. From an audiophile point of view, this would of course be a senseless waste of potential. However, this could be an argument for temporary operation on the smart device for all those who sometimes travel without an additional DAC.

Review: Acoustune HS1750Cu with rubber adapters
Everything perfectly finished: Acoustune HS1750Cu with braided cable and rubber adapters (Photo: Stereo Guide)
Review: Case for ACoustune In Ear Monitors
The included case proves value and long-term stability. (Photo: Stereo Guide)
Acoustune IEM ear canal adapter under review
The manufacturer supplies 9 adapters in different materials and sizes (Photo: Stereo Guide)
Inside Acoustune HS1750Cu under test
As edgy as the housings look from the outside, as ergonomically shaped are the insides (Photo: Stereo Guide)

Amazingly comfortable to wear, 9-fold

Admittedly, we were skeptical as to whether the in-ear-monitors, which are milled from aluminum and have an eye-catching shape, could be placed comfortably and securely in the ear canal. In practice, however, this was super easy and left nothing to be desired from any of our test staff.

This is ensured on the one hand by the nine different adaptors included. The manufacturer proudly points out that all pads were designed and tested by the in-house development department. The adapters are not only finely differentiated in size, but also come in from different material and shape so we can very well imagine that every ear will find its matching one here.

Lord of the rings

First, there are memory foam rings that adopt temporarily to the shape of the ear canal. Many users might prefer those because they avoid the feeling of isolation. The classic rubber adapters turn out to be a bit stiffer. However, they are included in five sizes and should have the best chance of a tight fit. Those who prefer a compromise will still find three variants made of softer, thinner silicone. To avoid confusion, these are made of semi-transparent material while the aforementioned ones are black.

If you just halfway hit the size of the ear canal, the Acoustune HS1750Cu are easy to insert without any difficulty, twisting or pressing. The braided connection cable has to be routed behind the auricles, the rather wide aluminum constructions blend in amazingly ergonomically. Since the capsules stick out quite a bit and don’t rest against the inside of the ear, you practically don’t feel them. However, this also means that you can no longer lie on your ear sideways with it. If you like to fall asleep with in-ears or rest your head on a pillow on an airplane, you won’t be happy with the Acoustune.

This is what the Acoustune HS1750Cu sounds like

In the listening test, the HS1750Cu set off on a triumphant march. From tonal balance point of view, they somewhat resemble the Sennheiser IE 600 and Sennheiser IE 900 at first. They deliver highly accurate impulses and ultimate dynamics like you would expect it from a stage monitor. In addition, there is very exalted but superclean brilliance and a driving, ultra-deep and rich bass.

From hip hop to classical, no matter which genre you might want to listen to, Acoustune´s HS1750Cu amazed with a grippy, fast sound and ultimate resolution. We would describe it as a real pick-me-up that immediately transports the emotions of the music to your brain instead of lulling the listener. Those who are used to other, warmer-tuned in-ear-monitors might find them to be a bit on the bright side. But as this was accompanied by an amazing cleanliness, transparency and never hissed, we can recommend the Acoustune HS1750Cu without reservation even for sensitive audiophile ears.

Compared to the aforementioned Sennheisers, this was also the main difference: Despite all tonal and dynamic similarities, the Acoustune sounded a touch more elegant and refined, and also offered a bit more fundamental warmth. It only didn’t help with the somewhat hefty treble of some pop and rock recordings from the 1970s and 1980s. Peter Gabriel’s III and Led Zeppelin’s “Houses Of The Holy” sounded as they have to sound over high-resolution studio monitors: Solidly, aggressively brilliant on the one hand, a bit overproduced on the other.

Diving deeper into the music

The fact that the Acoustune is powerfully equipped in the low bass is actually only noticed in recordings in which corresponding frequencies occur at all. In other words, there is no artificial bass emphasis. But if the recording is up to the task, you will experience an abysmally deep, rich bass that is perfectly integrated timing-wise.

Staging and imaging were less attuned to the directness of a stage monitor. It rather resembled an optimized mastering studio: tending to be close but never intrusive, with implied spaciousness but no exaggerated staggering in all three dimensions.

Thus, at the end of the listening test, we can only express our appraisal: Acoustune´s developers composed top-notch high-resolution in-ear-monitors with audiophile qualities and grippy emotions. This immediately makes you forget all even more complex constructions. Especially if you are an in-ear fan looking for the virtues of a monitor without having to accept the disadvantages like harshness and directness.

Alternatives to the Acoustune HS1750Cu

There is a lot of renowned competition in the IEM segment between 500 and 1000 bucks. Our top recommendations in the passive segment and the references for listening comparison are the Sennheiser IE 600 and the Beyerdynamic Xelento 2nd generation (The latter used without its bluetooth neckband).

Those who prefer a softer, more sober tuning or like to listen to older pop/rock recordings with a shot of beautifyed sound will probably be happiest with the Beyerdynamic. The Sennheiser IE 600 and the Acoustune are quite similar. Here, it’s ultimately a matter of taste: a slight loudness and unfiltered directness like the Sennheiser? Or even more resolution and a slightly richer sound with the Acoustune HS1750Cu?

Technical data Acoustune HS1750Cu

  • Retail price: 700 dollars/pounds/euros
  • Type: In-Ear
  • Transducer principle: Dynamic
  • Weight: 7.6 g each without cable
  • Features: 8 pairs of silicone ear adapters (S, M, L), 1 pair of foam adapters , hardcase.
  • More at: www.cma.audio
  • Headphone Guide
  • Magnat Monitor Active 2000: review
  • Sennheiser IE 600 review
Black
Stereo Guide – Das HiFi-Magazin
Stereo Guide
  • Facebook
  • Instagram

On Stereo Guide you will find competent and objective tests for Bluetooth speakers, headphones and car HiFi by experienced journalists.

Related Posts

Sony WF-C710N with ANC review

Pink different: Better than the last generation?

Sony WF-C710N with ANC review

Cambridge Audio Melomania M100 review

Battery marathon and sound offensive - is that enough for a win?

Cambridge Audio Melomania M100 review

Cambridge Audio Melomania M100 now in stores

New British in-ear with aptX Lossless support

Cambridge Audio Melomania M100 now in stores

Libratone Air+ 3 review

Software update against warm sound – does it make these in-ears better?

Libratone Air+ 3 review

Advertisement
Werbebanner Audio Reference Velodyne
Most viewed Articles

Tribit StormBox 2 review: Legacy obliges

That's why the new generation is even better in all key respects

Tribit StormBox 2 review: Legacy obliges

In the review, the Tribit StormBox 2 delivered a powerful performance with comparatively rich bass and clear, natural voice reproduction.

Edifier M60 review: desktop speaker with Bluetooth

Small wonder: tiny sound sensation for the desk

Edifier M60 review: desktop speaker with Bluetooth

Despite their tiny size, the Edifier M60s offer a great sound. However, one small flaw prevents them from being used as a hi-fi system.

Klipsch The One Plus review

Retro speaker with PC connection

Klipsch The One Plus review

The Klipsch The One Plus is aimed at the small, select circle of retro Bluetooth speakers. It is technically at the forefront with a USB socket for PCs.

Harman Kardon Luna review

Counterpart to the JBL Flip 6 in fine twine

Harman Kardon Luna review

The Harman Kardon Luna is a successful combination of stylish design and outstanding sound quality. It is a JBL Flip in elegant.

Edifier MR3 studio monitors review

What can you expect from a stereo set in the 150 euro class?

Edifier MR3 studio monitors review

The Edifier MR3 is aimed at hobby musicians and offers real stereo sound for a small budget. And it comes with many analog inputs.

Qobuz Playlists by STEREO GUIDE
Latest Articles

Panasonic SC-TMAX45 review: Party only at the socket

House music: The party speaker that needs a power socket

Panasonic SC-TMAX45 review: Party only at the socket

Panasonic SC-BMAX10: Amazing performance

Better bass is hardly possible in this class

Panasonic SC-BMAX10: Amazing performance

Panasonic SC-BMAX5 review: Inexpensive but good party speaker

Amazing performance in the class up to 300 euros

Panasonic SC-BMAX5 review: Inexpensive but good party speaker

Sonos Ace: What the software update brings

Practical test of the new functions

Sonos Ace: What the software update brings

Teufel ROCKSTER NEO presented: Mobile Bluetooth speaker achieves 130 dB

Party until the police arrive

Teufel ROCKSTER NEO presented: Mobile Bluetooth speaker achieves 130 dB

STEREO GUIDE – The Hi-Fi Magazine
STEREO GUIDE – The Hi-Fi Magazine

Here on STEREO GUIDE – the online hi-fi-magazine – you will find profound and independent coverage on bluetooth speakers, headphones, home-hifi gear and in-car entertainment reviewed by experienced journalists. Our authors have one thing in common: expertise and a lot of listening experience both in terms of live concerts and state-of-the-art audio systems.

  • Home
  • Data protection
  • Imprint
© 2025 Stereo Guide

Type above and press Enter to search. Press Esc to cancel.

Manage cookie consent
We use cookies to optimize our website and service.
Functional Always active
Technical storage or access is strictly necessary for the lawful purpose of enabling the use of a particular service expressly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a message over an electronic communications network.
Preferences
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
Statistics
The technical storage or access that is used exclusively for statistical purposes. The technical storage or access used solely for anonymous statistical purposes. Without a subpoena, the voluntary consent of your Internet service provider, or additional records from third parties, the information stored or accessed for this purpose alone generally cannot be used to identify you.
Marketing
Technical storage or access is necessary to create user profiles, to send advertisements, or to track the user on a website or across multiple websites for similar marketing purposes.
Manage options Manage services Manage {vendor_count} vendors Read more about these purposes
Settings
{title} {title} {title}