ZE300 for ASMR

The newly designed

A8000 is a completely redesigned model that combines extremely low distortion rate and high responsiveness thanks to the beryllium driver developed at the time. These characteristics were also reflected in the sound, with an overwhelmingly clear and expansive mid-high range and sharp rises and falls in the low range, creating a special sound that cannot be replaced.
However, the true beryllium used in the diaphragm of the A8000 became difficult to continue manufacturing due to material procurement issues, and we had no choice but to discontinue the sale.

7 years since its release in 2019. Using new research results obtained during this period and the know-how cultivated through the development of the A10000, which uses a diamond diaphragm, we were able to not only achieve the sound of the A8000 using materials other than beryllium, but also develop an even higher-quality model.

The "DC" name given to this model comes from the musical term "Da Capo" (meaning to return to the beginning of the score).
This is a completely new "A8000" that incorporates current technology and research results and has all parts newly designed and selected.

Development of an ultra-low distortion DU equipped with a true magnesium diaphragm

What is required of a diaphragm is both ``ease of movement'' and ``resistance to distortion'' that instantly return to a fixed position without causing unnecessary deformation in response to driving force. Seven years after the release of the previous model A8000, it became difficult to continue manufacturing the true beryllium material used for the diaphragm due to material procurement issues. Therefore, the development team selected magnesium as a new diaphragm material.

If we compare the ease of deformation of the objects themselves, magnesium is not as good as beryllium. However, since magnesium is about two-thirds lighter than aluminum, the diaphragm itself can be made thicker without increasing its weight. Bending rigidity is proportional to the cube of the plate thickness, so when magnesium is able to maintain a certain thickness and is combined with structural reinforcement through the dome shape, it is possible to achieve high bending rigidity that exceeds the physical properties of the material itself. This product uses a "True Magnesium" diaphragm to further bring out this characteristic. In order to compensate for the strength that pure magnesium has, we created a unique alloy to ensure the strength required for a diaphragm without compromising its lightness.

When observed with a laser displacement meter, a typical metal diaphragm deforms minutely in various directions when driven, which causes distortion, but in the case of true magnesium, due to its high bending rigidity, the displacement of the entire diaphragm is extremely small, minimizing the noise generated on the diaphragm surface. The development team aimed to create a new ultra-low distortion DU that does not rely on beryllium by applying the diamond diaphragm manufacturing and molding technology cultivated through the development of the A10000.

Since magnesium is lighter than beryllium, the problem of film-based edges rolling under the weight is less likely to occur. On the other hand, with common edge materials, the problem of split vibration, where resonance occurs at a specific frequency, cannot be avoided even if the material is changed. Therefore, we similarly adopted the special polyurethane established in the development of A10000. It is lightweight, highly elastic and stretchable, and satisfies the contradictory requirements of allowing the diaphragm to move easily and suppressing unnecessary resonance.


Rather than bonding using a general adhesive, we apply a unique molding technology that combines pressure molding and thermoforming using a mold to create intermolecular bonds without adhesive. This fundamentally solves the problem of individual differences due to differences in the amount of adhesive applied between the diaphragm and the edge.


By wiring the voice coil lead wire in the air instead of gluing it to the edge, we follow a design that does not interfere with the accurate piston motion of the diaphragm. To prevent wire breakage, we usefinaloriginal aluminum alloy wire for the wire.


Through the development of the above materials and molding technology, the newly developed DU equipped with a true magnesium diaphragm has succeeded in further reducing the distortion rate in the ultra-low range around 10Hz, even compared to the true beryllium diaphragm of the A8000.

Highly rigid stainless steel cutting casing

The casing has a machined structure that is precisely machined from highly rigid stainless steel. It is designed to firmly support the driver and suppress unnecessary vibrations, making the outline of the sound clearer. The
finish is mirror polished and IP (ion plating) processed to achieve a deep navy color. Unlike painting, the feature of IP processing is that it can develop color while preserving the texture of the metal.It is resistant to fading or peeling over time, and is a finish that takes advantage of the metallic feel of machined stainless steel.

Designed with long-term use in mind and easy to repair

Long-term repairs are possible by not using adhesives for assembling the casing and attaching the DU, and using screws that are difficult to design. In addition, each component is strongly supported by the tightening force of the screws, suppressing unnecessary resonance.

Excellent fit with less contact area

Whether or not the earphones are comfortable to wear is determined by the feeling of pressure. At first glance, the method of holding the earpiece using the repulsive force of silicone, such as choosing an ergonomic and organic shape, seems to be the right method, but it constantly puts pressure on the ear, which puts strain on the ear without realizing it and causes fatigue to accumulate. Compared to the organic, large surface that touches the ear, we aimed for a shape that limits the contact area to create a comfortable fit without any pressure. Therefore, it fits most people's ears. If there were no feeling of pressure at all the points of contact, it would be so comfortable to wear the earphones.It has an excellent fit that makes you feel like you are wearing customized earphones. Additionally, the housing size is smaller than the A8000, making it easier to fit in your ear.

ePTFE silver coated cable with high-precision proprietary MMCX connector

Jointly developed with Junkosha, a company famous for developing and manufacturing cables that pursue signal transmission speeds for the K supercomputer. The wire material is silver-coated OFC wire, which combines the know-how that Junkosha has cultivated over many years under the Junflon brand, and the insulation coating is ePTFE (Expanded Teflon™), which boasts an even lower dielectric constant than conventional PFA (fluoropolymer).

The MMCX connector has been redesigned to be more reliable and more precise than the conventional in-house developed product. 2PIN relies on the springiness of the pin itself for its removal force, making it difficult to provide structural durability, so MMCX is used for long-term reliability.

*The MMCX connector of this model is a high-precision product, so it is designed to be particularly difficult to insert and remove. We do not recommend re-cabling or inserting or removing terminals for purposes other than replacement due to failure.

Two types of eartips, "FUSION-G" and "TYPE P" are included

This product comes with two types of eartips, "FUSION-G" and "TYPE P", each in 5 sizes of SS/S/M/L/LL. Comes with an earpiece case.

＜FUSION-G＞ The triple hybrid structure combines three materials: ultra-density foam, soft silicone, and high-elastic silicone to achieve both high sound insulation and a comfortable fit without feeling pressured. "Super density foam" has a thin design and can be installed without crushing it with your fingers. This reduces the feeling of pressure and achieves high sound insulation. In addition, since they use the same shape as the silicone type, there is little chance that the sound quality will change, bringing out the original sound quality of the earphones you are using.

＜TYPE P＞ Uses two types of silicone materials with different hardness for the sound conduit part and the part that touches the ear. The sound conduit part is made of silicone, which is harder than the part that touches the ear, and is grooved to achieve both strength and flexibility. The parts that touch the ears are made of soft silicone, providing a comfortable fit and high sound insulation. By making the shaft color gray on one side and red on the other, you can easily tell the left and right sides apart even in dimly lit places by flipping the earpiece slightly and checking the color of the earpiece shaft.

Replaceable dust filter

The opening of the dust filter part may become dirty due to earwax, etc. The A8000 DC has a dust filter that can be replaced by the customer, and a replacement dust filter and a maintenance tool used when installing the dust filter are included in the package.

*The product is shipped with a dust filter already installed, so there is no need for customers to install it separately when opening a new product. If the dust filter becomes dirty after using it for a while, please replace it with the included dust filter yourself. Please refer to the instruction manual for replacement instructions.