Clear sound quality and a vast, deep sound stage.
With the synergistic effect of a hybrid design that merges balanced armature with a 50mm diameter dynamic driver unit coupled with BAM mechanism, we've achieved a clear, vast sound stage with depth to it. With these, the music that seemed to be localized inside our heads with existing headphones vibrates over
a large space.
BAM mechanism produces bass sounds and stereo spatial interpretations
With balanced armature driver units, iron is driven to produce sound, and as such, these drivers face a number of problems, amongst which are "proving tiring to listen to", "having sound that is subtle and beautiful, but lacking in depth and being flat" and "lacking bass interval". At final, we decided to focus on developing technology for the reproduction of bass tones and three-dimensional space with the full-range reproduction of a theoretically unproblematic single driver unit, rather than taking things in a multiway direction. We went back to the beginning and reviewed the performance of the balanced armature driver, focusing our attention on something we had previously overlooked ? airflow inside the housing. We developed BAM (Balancing Air Movement), a mechanism that optimizes airflow inside the housing through the creation of an aperture in the driver unit, which is usually sealed.

While achieving bass tones and deep, three-dimensional spatial representation, which proved difficult with single driver full-range reproduction, we achieved a BA type that at the same time made for natural listening the user doesn't tire of.
Balanced armature driver developed by our company
Balanced armature driver unit developed by our company for optimal use as a tweeter. We've paid special attention to our choice of materials used in our pursuit of sound quality, utilizing a permalloy with a high level of magnetic permeability in the magnetic circuit.
Newly developed 50 mm φ dynamic driver
A driver unit with a diameter of 50mm, newly designed for SONOROUS. By increasing the precision of the parts, it has become possible to make the gap between the magnetic circuit, the pole piece and the yoke narrower than with common products. A powerful neodymium magnet is coupled with this,
making for a high magnetic flux density. The result is clear sound quality.

We've re-examined the shape of the tangential edge and have employed a lightweight diaphragm with a heightened responsiveness to micro-signals.

The voice coil is copper-clad aluminum wire CCAW. Clear, crisp bass tones are achieved with the combination of a magnetic circuit with a high driving force and a light vibration system.

So as not to inhibit the sound emanating from the driver unit, and so that there is no unnecessary added reverberation, a form that is as slim yet as strong as possible has been pursued. This contributes to clear
sound quality.
Ear pads with the optimum resilience for a comfortable fit
What plays an important part in sound quality is the fit between the user's ear and the ear pad. If there is space between the two, then bass tones are lost; if the ear pad presses against the user's ear with too much pressure, then apart from it being uncomfortable, the acoustic pressure of the bass tones rise too high, resulting in negative influences on sound quality. In spite of this, there was no evolution seen in the ear pads on the market, and they continued to be made using the same structure for many years.

We got engineers who had been involved in the development of corsets to participate in developing our ear pads, and re-examined the fit between the user's ear and the ear pad. By employing the appropriate technology – pursuing synthetic leather with the best elasticity and the best sponge cutting and adopting ultrasound fusion for the adhesion of the synthetic leather to the inner frame – we constructed an unwrinkled, three-dimensional form with just the right amount of tension to it.
Aluminum back plate
A 1.5mm thick aluminum back plate at the back of the driver unit for achieving air pressure balance. Not only air pressure balance but also great results in the suppression of unnecessary vibrations are manifested.
Rigid ABS housing with matt coating
To achieve a high level of precision with the hard matt-finished ABS housing used with high-grade camera lenses, we conducted a substantial number of simulations, right up to the fluidity of the molding
material used.
Detachable cable with locking function
We employed a gold-plated monaural plug with a 3.5mm diameter for the connector on the headphones. By employing a connector with a long-standing performance record, we avoided any trouble resulting from poor contact owing to deterioration due to aging. The cable has a locking mechanism that rotates 90 degrees.
Product code
50mmΦ dynamic + balanced armature
Cord length
Detachable cable with locking mechanism (1.5m)
Sound quality reviews
Headphones with a characteristic calm freshness. Headphones with a dry timbre that make for solid listening. The sound emanating from these headphones emerges from repose (silence), and as such, we encourage you to use them for listening to jazz and classical music. For those looking for mellow, refined sound.
User reviews
I've bought a variety of different earphones, but SONOROUS IV is the first set of headphones that I've bought. Personally, I think that they're well-suited to light music with not much bass and female vocals. They're definitely not portable (LOL).
I've only just bought them, but I look forward to using them a lot more!
(male, 20-29 years)
Headphones and earphones for concentrating on music.
I misjudged the potential of SONOROUS IV, which was added to the collection of thirty or so products this year. These headphones with their rare hybrid configuration have changed my music life. I was already aware of the vast sound field through Heaven, I had a sense of expectation when I bought these; the three-dimensional feel of the sound and the resolution was just fantastic. Like sumptuous food on a plate, each sound conveys its own flavor; smooth bass tones, dazzling vocals and stimulating guitar sounds attack the ears. The overlapping sounds have a good feel to them.

That's kind of what I wrote, but honestly, this is a good product. While they can't really be described as portable with their weight, size and sound leakage, they fully support the music in my life when I'm using them at home. Personally, I preferred IV over VI. It goes without saying that X is what I aspire to, so there's no comparison, but these are priced such that they are affordable to all, and they give you a sense of satisfaction that can't easily be achieved.
(- , 30-39 years)
User’s manual
Right click the button below and choose “Save link as” to download.