Wooden technology breaks through JVC HA-SW01&HA-SW02 earphones

At the beginning of 2015, the top earphone headset FX-1200 equipped with wooden diaphragm was officially introduced to Taiwan, which was favored by many headphones players. Yesterday, JVC's Taiwanese distributor Dongyou Technology held a presentation on "HA-SW01" and "HA-SW02" earmuff wood diaphragm headphones in Taipei's "Taipei" Wenchuang Space. It can be seen that JVC is used in wood materials. The technology continues to improve, and constantly introduces unique high-end headphones.

JVC耳机

Wooden diaphragm for 30 years

Before the official report, we may wish to briefly introduce the history of JVC wood diaphragm: About 30 years ago, the JVC engineering team began to try to manufacture speakers with wooden diaphragm. Why is there such an idea? Because they found that the resonance box of most instruments is made of wood, the diaphragm made of wood can achieve a closer to the original sound. In addition, they also found that wood conducts faster than pulp and polymer, and because of the dense lines of wood, the resonance decays faster than aluminum, which can greatly reduce the sound.

However, the starting point of the wooden diaphragm unit is simple, but the development process can be said to be twists and turns, because the wood is easy to crack and it is difficult to make the shape of the cone. For this reason, the development of wood cones has been hindered.

JVC耳机

JVC耳机

Dongyou Technology released HA-SW01 (top) and HA-SW02 (bottom) equipped with wood film technology on 3/16. Both designs and units are the same. The difference is that the HA-SW01 earmuffs are used internally. Wooden tuning parts.

Finally, how did the JVC team break through this difficulty and successfully launch the wood-sounding audio product? In the JVC-FX1200 audition held at the Jiayu Electronics in Taipei last year, Miura Takuji, one of the development teams, mentioned that he went to a house to eat grilled squid and found that the grilled squid was particularly flexible and chewy. Asked, the squid of this home wine house was soaked in sake, so it would not be hard after burning. The JVC development team was inspired by the use of sake and self-developed styling liquid for birch processing, and successfully launched the "Wood cone" series of speakers with birch diaphragm.

Headphone market is moving towards high unit price

Yesterday's presentation was kicked off by Chi Bian, senior manager of the marketing and marketing department of the audio and video consumer market at JVC Japan. He pointed out that although the number of sales of Japanese headsets has decreased year by year in the past five years, the sales amount has increased year by year. This trend means that the unit price of headphones has increased year by year and is moving towards higher-end market. Therefore, JVC decided to introduce wood diaphragm technology into headphones. Among them, the introduction of high-end headphones with differentiation.

However, the earphones are small in size, and in order to have high sensitivity, the diaphragm must be thin and light, which is a very difficult challenge for wood technology. Fortunately, the JVC engineering team has overcome all difficulties and developed wooden diaphragm headphones. “JVC's research on wood materials is deepening, and its technology is growing like an annual ring,” said Chi.

木质薄膜

木质薄膜

HA-SW01 venue display birch sheet with 50 μm (on) HA-SW02 in use and the use of HA-FX1200 other ear canal earpiece birch sheet of 80 μm (below). It can be seen that the former is transparent and lighter.

Use thinner birch flakes

Next, the senior engineer of the audio-visual consumer marketing department, Beiyan Gongyan, explained the technical design of HA-SW01 and HA-SW02. According to Beiyan, the two earphone units have a diameter of 40mm, and the required birch sheet area is 11 times larger than that of the HA-FX1200. More importantly, the thickness of the birch sheet used this time is only 50μm compared to the HA-FX1200. The birch flakes are still 30 μm less.

Beiyan further stated that in the past they wanted to make earmuffs with wood chips from HA-FX1200. However, the 80μm diaphragm could not achieve the desired sensitivity, so 50μm birch flakes can be said to be a breakthrough in technology. How thin is 50μm? According to Wikipedia, the thickness of a piece of paper is about 70 to 180 μm, and the length of a red blood cell is 10 μm. In other words, the birch slices used by HA-SW01 and HA-SW02 are about five red blood cells thick. cell. From the sample of the wooden diaphragm placed on site, if 50μm is placed on the printed matter, the paper text below can be clearly seen. On the contrary, the transparency of the 80μm wood diaphragm is far less than 50μm.

The JVC development team also combined birch flakes with a PEN diaphragm with a thickness of only 16μm. According to Beiyan, the PEN material can be thinner and more tough than the common PET material. He pointed out in the briefing that the 16μm PEN Combined with a 50μm wood diaphragm, it can reduce the weight by 30% compared to the combination of 23μm PET and 80μm wood diaphragm. Overall, the diaphragms used in HA-SW01 and HA-SW02 are focused on lightweighting, giving headphones a better high-frequency reduction capability.

木质插件

木质挡板材料

The SW-HA01 uses wooden parts inside the earmuffs. In addition to the vibration-suppressing function, the uneven surface of the wood dissipates the reflected sound in the earmuffs to convey clear sound.

木质外壳材料

This is the wooden material used on the earphone casing. It is made of tens of layers of 1mm wood and has a strong texture and vibration suppression.

Disk-shaped upper plate increases magnetic density

Another important part of the earphone unit is the magnetic structure, and the HA-SW01 and HA-SW02 also use a new "disk-like structure" magnetic device, and the top plate above the neodymium magnet is ring-shaped with the same diameter. The structure is changed to a disc-like structure in which the diameter is gradually reduced. According to Northern Rock, this design increases the magnetic flux density of the magnet to 1 Tesla, which in turn increases the driving force and the linearity of the voice coil motion, reducing distortion.

HA-SW01零件分解图

On-site display of HA-SW01 parts exploded view, from left to right, ear pad, ABS resin baffle, maple baffle, brass vibration ring, diaphragm, wooden board attached to the upper plate, upper plate With neodymium magnet, high-strength synthetic resin unit frame, high-strength synthetic resin unit bracket, maple stick, sound-absorbing material, vibration-damping maple block, and earphone housing. Among them, Maple baffle maple stick, sound absorbing material and vibration suppression maple block are unique parts of HA-SW01.

Using wood tuning

In addition to the unit structure, the JVC team also carefully studied the material structure inside and outside the HA-SW01 and HA-SW02 ear cups. Wood material is attached to the earmuff shell. Dear readers, don't think that this is put on a piece of wood. According to Beiyan's explanation, this piece of wood is actually a hard material made of dozens of layers of 1mm thick wood, which has excellent effect on absorbing the shock of the shell. When you see this, someone will ask, Taiwan's climate is hot and humid, and the wooden diaphragm and wooden shell can pass the severe test of the climate. Northern Rock said that they have long considered the impact of climate on wood, because Japan also has a climate of plum rain and summer heat. He emphasized that these woods are specially treated and have certain moisture and heat resistance properties.

In the structure inside the earmuffs, HA-SW01 and HA-SW02 use ABS resin baffle and brass vibrating ring in front of the unit. The outer frame and bracket of the fixed unit use resin containing glass fiber, high strength characteristics. Let the unit move steadily. The biggest difference between HA-SW01 and HA-SW02 is that the HA-SW01 also adds a tuning component made of maple wood. These components function like a diffuser plate placed in the audio listening room, because the wooden surface is uneven. Features break up the reflected sound in the ear shell, making the sound quality clearer.

单元振膜

Through the ear pads, it is clear that birch flakes are used on the unit diaphragms of HA-SW01 and HA-SW02.

In the audition area, the source used is the JVC SU-AX7 USB DAC ear extension. The AK4390 DAC chip and the “K2” digital up-conversion technology developed by JVC are used. The structure of the support circuit board in the chassis also adopts the suspension suspension design.

JVC耳放

Live singing, experience reproducibility

After listening to the serious technical explanation, the next step is to experience the moment. The organizer specially prepared more than 30 HA-SW01 seats in each guest's seat, and invited the famous independent singer Zheng Yinong to sing live. The result of mixing the music and music was transmitted to each by HA-SW01. In the ear of a person. When listening, you can feel the HA-SW01 has a spacious sense of space, as well as a full and controllable bass.

JVC's research and development of the use of wood materials can be said to be perseverance, excellence, I believe that in the future JVC will also challenge the wood diaphragm technology, launch more amazing high-end products.

郑宜农

The well-known music creation singer Zheng Yinong brought the song "Golden Flower" written by her for her grandmother to the audience. The HA-SW01 earphone was transmitted to the ear of each participant to experience the original sound ability of the earphone. Zheng Yinong said that when she listened to her songs with HA-SW01, she heard many details and reminded her of the original intention and original intention of the song.

Equipment specifications
HA-SW01
Type: Enclosed moving coil unit earmuffs Headphone drive component: 40mm moving coil unit frequency response: 8Hz to 45,000 Hz
Sensitivity: 105 dB/1mW
Impedance: 56 Ω
Power handling capacity: 1,500mW
Tuning parts: copper shock ring, wooden board, wooden ring baffle, wooden stick, wooden tuning board wire: 1.2 m detachable Y-type 4N OFC headphone cable.
Pricing: NT$19,900
HA-SW02
Type: Enclosed moving coil unit earmuffs Headphone drive component: 40mm moving coil unit frequency response: 8Hz to 45,000 Hz
Sensitivity: 105 dB/1mW
Impedance: 56 Ω
Power handling capacity: 1,500mW
Wire: 1.2 m detachable Y-type 4N OFC headphone cable.
Pricing: NT$14,900 Agent: Dongyou Technology

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