Concept
Pulse and Presence.
A transcendent listening experience,
conducted by IBUKI.
Within the format of a cable-detachable universal earphone, we have embodied the "highest pinnacle of sound" that Brise Audio envisions.
What we aimed for was a low range with a tangible sense of presence, as if masses of air were pressing forward. And a delicacy in which each individual note, released into space, rises smoothly and comfortably into relief.
We envision a vivid sound that allows you to keep listening to your favorite library endlessly, forgetting the passage of time.
In combination with the WATATSUMI portable headphone amplifier, it delivers the highest pinnacle of the listening experience.
Technology
KEY FEATURES
9-driver / 5-way tribrid configuration
Low Frequency
LCP Dynamic Driver
Opposed drive
The highly acclaimed 8 mm LCP diaphragm DD used in FUGAKU has been updated to Ver.2. Two units are fixed face-to-face inside a gold-plated OFC ring chamber, achieving immersive low frequencies that are dense yet free from a sense of pressure.
Mid — High
Carefully selected BA drivers
+ EST drivers
A total of five BA units made by Knowles and Sonion are integrated by means of a proprietary crossover. Dual EST drivers expand the soundstage and airiness in the ultra-high frequencies. While suppressing sibilance, the result is a finish in which each individual note emerges with clear definition.
Shell
Grade 5 titanium housing
PVD charcoal black
The high-strength, high-hardness Ti-6Al-4V housing eliminates sonic clouding caused by resonance. The PVD coating reduces scratches and provides a smooth, pleasant tactile texture.
Acoustic Design
3D-printed integrated acoustic tube
driver unit holder
The driver outputs are combined by acoustic tubes incorporating multiple tube diameters and lengths. This achieves a seamless and smooth connection of sound that does not give the impression of mixed multi-driver reproduction.
Crossover
High-precision 5-way
passive crossover circuit
Constructed with high-quality components such as thin-film resistor attenuators and film capacitors. With stable characteristics resistant to temperature changes, it transmits the signal to each driver without clouding.
Enhancement
Brise Audio proprietary
High quality sound processing
Original HCNT and special electromagnetic wave absorption materials block external noise and inter-driver interference. The felt sound-absorbing material on the rear absorbs and attenuates internal housing reflections. The included cable, "BSEP for IBUKI," is also subjected to Ultimate-grade High quality sound processing using the latest materials, including HCNT.
Driver Configuration
9 DRIVERS / 5 WAY
Tribrid configuration with drivers optimally allocated to each frequency range
Low
8mm LCP
Dynamic Driver
Liquid crystal polymer diaphragm dynamic driver
Opposed drive
The 8 mm diameter liquid crystal polymer (LCP) diaphragm dynamic driver, which is also used in FUGAKU and is well regarded for its low-frequency expressiveness, has been updated to Version 2 with characteristics adjusted to suit IBUKI. The output of unnecessary frequency ranges that would otherwise be attenuated by filters and similar means has been suppressed, enhancing reproduction capability in the sub-low frequency range. By means of an opposed configuration in which two units are fixed face-to-face inside a gold-plated OFC ring chamber with appropriate softness and vibration damping properties, the vibration of the units themselves accompanying diaphragm operation is mutually canceled while achieving optimal drive. It realizes springy low frequencies that retain density while suppressing a sense of pressure, allowing for greater enjoyment and immersion.
Low-mid
Sonion BA
Sonion balanced armature driver
To richly portray the warmth of vocals and the body resonance of instruments, a Sonion BA driver is employed for the low-mid frequency range. It smooths the transition between frequency ranges with the dynamic driver and naturally expresses low-mid frequencies with substance.
Mid / High
Knowles BA
Knowles balanced armature drivers
To depict the delicate nuances of vocals and the harmonic components of instruments in full, two Knowles BA drivers each are arranged for the mid and high frequency ranges. While realizing a balance in which each individual note stands out clearly by taking advantage of the excellent transient characteristics unique to BA drivers, irritating sounds such as sibilance have been suppressed to achieve a smooth finish. For the high-frequency drivers, noise floor reduction was pursued by implementing a modification in which the two units, which are normally configured as one unit through parallel connection, were changed to a series connection.
Ultra-high
EST
(Electrostatic)
Dual electrostatic drivers
Two EST (electrostatic) drivers are employed for the ultra-high frequency range. They enhance soundstage expansion and airiness, realizing a sound with a strong sense of realism. Unlike MEMS, they are designed not to require a dedicated amplifier, allowing you to enjoy delicate and extended ultra-high frequency expression even in combination with standard DAPs and portable amplifiers.
Housing
SHELL
Ti-6Al-4V (Grade 5 titanium) + PVD coating
By using Ti-6Al-4V (Grade 5 titanium), renowned for its high strength and hardness, for the housing, sonic clouding and unwanted resonance caused by housing resonance are prevented, realizing clear, speed-oriented tight low frequencies and extended high frequencies. A PVD coating has been applied to the surface to reduce fine scratches from everyday use and improve the feel against the skin with a smooth texture.
Ear hanger structure
The ear hanger made of soft resin (TPE) containing stainless steel wire prevents rotational displacement of the housing caused by the weight of the cable or pulling force. It provides a stable fit even during long periods of use. The degree of bend and angle can be freely adjusted by hand.
OFC Pentaconn Ear connector
The OFC version of the Pentaconn Ear made by Nippon Dics is employed. Its low contact resistance minimizes sound quality loss, and it features a robust structure that is resistant to deterioration even after repeated attachment and detachment.
Engineering
INSIDE IBUKI
Acoustic Design
Acoustic tube-integrated driver unit holder
utilizing 3D printing technology
By combining the sound output from each driver through a driver unit holder incorporating multiple tube diameters and lengths, a seamless and smooth connection of sound has been achieved that does not give the impression of a mixture of multiple types of drivers.
By adopting 3D printing technology, complex internal structures that were impossible to form with high precision using conventional manufacturing methods employing vinyl tubes and similar materials have been precisely realized. The fine shapes of the acoustic tubes combine the output of each driver at the optimal timing and balance.
Crossover
High-precision 5-way
passive crossover circuit
In order to adjust the sound pressure balance of each driver while transmitting the signal without clouding, a 5-way passive crossover circuit has been constructed using high-quality components such as attenuators employing thin-film resistors with high precision and stability and little influence from temperature changes, as well as film capacitors that are free from coloration and offer excellent frequency characteristics.
For the internal wiring connecting the drivers, Brise Audio original pure silver litz wire is used to suppress loss.
Enhancement
Brise Audio proprietary
High quality sound processing
Brise Audio original HCNT (high-grade CNT) and special electromagnetic wave absorption materials are applied to the surface of each driver and the transformer of the EST, blocking external noise and inter-driver influence to realize a sound with a high sense of separation.
As with FUGAKU, felt sound-absorbing material is placed on the rear of the dynamic driver, absorbing and attenuating the sound emitted from the rear port of the driver and reverberating inside the housing, thereby reducing adverse effects on each driver.
Included Cable
BSEP for IBUKI
Ultimate-Grade Cable
IBUKI-dedicated tuning Ultimate-grade cable
Based on AKAGANE-35 wire material with a Quad Spiral structure, and by applying IBUKI-dedicated tuning Ultimate-grade High quality sound processing in which the shield layer is formed by combining multiple materials centered on HCNT (high-grade CNT), both power and delicacy have been achieved.
Newly designed Grade 5 titanium metal parts created to harmonize with the earphone body, as well as Brise Audio original special copper alloy plugs, are used.
Wire
AKAGANE-35
Conductor
High-functionality
high-purity Copper
Structure
Quad Spiral
Hardware
Made of Grade 5
titanium
Accessories
Genuine Leather
Carrying Case
A high-quality genuine leather carrying case worthy of IBUKI is included. It is designed so that, together with the earphone body, the cable can be stored and carried in a loosely coiled manner to make it less prone to developing bends, and the Ultrasuede used on the inside of the lid prevents scratches during transport.
Included Accessories
- Genuine leather carrying case
- AZLA SednaEarfit Max eartips (6 sizes)
- Ultra Suede cable clip
- Velour drawstring pouch
Variation
EDITIONS
Launch Edition
Charcoal Black (PVD) + Gold (PVD)
Made to order / Shipping scheduled to begin from late June 2026 onward
Standard Edition
Charcoal Black (PVD) + Titanium Grey
Made to order / Shipping scheduled to begin from late June 2026 onward
Launch Edition
To commemorate the launch of IBUKI, we have prepared a special Launch Edition limited to 50 sets worldwide, incorporating gold, the theme color of Brise Audio. The accent parts finished with PVD gold coating add a brilliant touch to the charcoal black housing.
* The only difference from the Standard Edition is the coloring.
The driver configuration, tuning, and included accessories are all the same.
Details
SPECIFICATIONS
EST ×2 + Knowles BA ×4 + Sonion BA ×1 + 8mm LCP DD ×2
IBUKI-dedicated tuning / Ultimate grade
Genuine leather carrying case
Ultra Suede cable clip
Velour drawstring pouch
Experience
IBUKI
The Finest Pure Listening, for Your Ears
Launch Edition
Charcoal Black + Gold (PVD)
Price: Open
Reference price
Standard Edition
Charcoal Black + Titanium Grey
Price: Open
Reference price
Made in Japan — Hand-assembled in-house by Brise Audio in Tamamura, Gunma
Made to order / Shipping scheduled to begin from late June 2026 onward
Debut — Spring Headphone Festival 2026 — 2026.04.25
