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1DD 6BA Hybrid/ Highly balanced tonality/ 5N Silver plated Copper cable/3.5+4.4 interchangeable plug/Artisan hand painted faceplate/Ergonomic shell / 3D Printer Partner with HeyGears

Relentless background
The story originates from the Chinese fantasy literature, "Shanhaijing" (Classic of Mountains and Seas). It tells the tale of Lass, the youngest daughter of Yan Di, who tragically drowned while swimming in the East China Sea. She was subsequently transformed into the bird known as Relentless. Determined to prevent such a tragedy from befalling others, Relentless took it upon herself to protect all living beings by reclaiming the sea.
In Chinese culture, the image of Relentless carries profound cultural significance. It symbolizes the spirit of reclaiming the sea and creating land, which is widely celebrated and has become an important folk belief and cultural symbol. The image of Relentless is often used to represent strength, bravery, and unwavering efforts—an inspirational example for us to emulate and pursue. Additionally, Relentless was considered one of the sacred birds in ancient China, believed to possess the ability to foretell fortune and misfortune while bringing inspiration and revelation.
The behavior of Relentless is filled with a romantic and idealistic spirit. Despite being weak in power, she perseveres in relentless efforts and struggles. In terms of appearance, there is a hand-drawn design theme based on Relentless feathers and the colors of splashing waves.

CAVITY DESIGN
Faceplate is hand-painted, sketched with a brush, using dark green as the main tone, giving people a pure and profound sense of art, which aligns with the essence of "Relentless". The intricate pattern on the cover depicts the feathers of the Relentless bird and the waves of the East China Sea, symbolizing the qualities of perseverance, strength, and bravery inherent in "Relentless". The choice of lightweight and durable resin material for the body not only emphasizes its texture but also allows for creative design possibilities, representing the seamless integration of traditional culture and modern technology.

Tuning Concept
In the eyes of an audio engineer, Relentless symbolizes strength, effort, and bravery. It represents an idealistic spirit filled with romanticism, so its sound should be emotionally rich.
Through mature multi-driver combination tuning experience, Relentless exhibits full and powerful low frequencies with rich layers, deep diving, and quick rebound. The mid-range accurately positions instruments and vocals, with sweet, soft, warm, elegant, delicate, and expressive female vocals that accurately convey the emotions and details of the music. The high frequencies are smooth, delicate, and possess both thickness and charm. The overall sound energy distribution follows a pyramid shape, with a warm tonality and a dense atmosphere. It excels particularly in expressing emotions in female pop music.

The IEM feature a 1DD 6BA configuration
The 8mm custom dynamic driver unit is responsible for the mid-to-low frequencies. With the implementation of a new generation of 8mm Celest dynamic driver unit and unique tuning techniques, it produces a richer and fuller sound, providing robust support for low-frequency extension and energy. The mid-frequency vocals sound natural and warm, with a wide and solid soundstage.2 Celest custom 29689 balanced armature drivers are responsible for the mid-to-high frequencies. The custom 29689 balanced armature drivers possess excellent acoustic performance in terms of clear and delicate sound reproduction and precise imaging, particularly in the mid-to-high frequency range. They accurately reproduce musical elements such as instruments, vocals, and details.
4 Celest custom 10012 balanced armature drivers are responsible for the high frequencies. The custom 10012 balanced armature drivers are easy to drive and deliver outstanding audio output even at low power. The four high-frequency drivers ensure extended performance and density in the high frequencies. Through scientific tuning, the high-frequency sound of Relentless remains consistent with the mid-to-low frequencies.