Oriolus Traillii Ultra IEM System 是把耳機的聲音表現，從“多單元堆疊”提升為“精確協調的主動式系統”。
歷經十年的研發積累，以一種前所未有的架構出現：
數位三分頻系統 + 12 通道獨立模擬放大，
為多單元入耳式耳機帶來真正意義上的“主動式三分頻”解決方案。
什麼是數字分頻
數位分頻（Digital Crossover）不同于傳統的類比濾波，其核心是由 32bit 音訊 DSP 以運算精度直接劃分頻段。
沒有電感、電容、電阻的容差誤差，沒有溫度漂移，沒有互相干擾。
DSP 以數學方式精確重建濾波曲線，因此能夠實現：
分頻點精度在理想值附近，無需依賴元件精度
±0.2 dB 的超平直頻響
幾乎可以忽略的相位偏移
頻寬、斜率、相位完全可程式設計
這是高端主動音箱領域的成熟技術，如今被壓縮到小巧的耳機系統中。
系統架構
在前端由 DSP 完成三分頻處理，分別輸出 低頻／中頻／高頻 × 左右聲道 = 6 路 × 2 = 12 路類比信號。
每一路信號均由 獨立的高保真類比放大與緩衝電路 驅動耳機對應的單元。
本質上，這是一套 “迷你版三功放主動系統”。
這種架構意味著：
每個單元都由專屬的功率通道控制，其行為完全脫離其他單元的負荷變化。
三分頻帶來的聲音提升
數字主動三分頻的優勢不僅是“分隔頻段”，而是：
低頻：更深沉、更具能量密度、瞬態回應更快
中頻：信息量更充沛、聲像結實、質感自然
高頻：延伸更輕盈、空氣感更真實、細節更完整
空間結像：相位一致性極高，聲場定位更精准
動態表現：多單元負載減少，整體動態範圍顯著擴張
為什麼 不採用傳統的模擬分頻
耳機內部的被動分頻器（電感/電容/電阻）天然存在局限：
元件公差導致分頻點偏移
高頻相位旋轉無法避免
單元之間互相牽制
插入損耗影響透明度
受溫度與濕度影響明顯
小腔體內部的電磁干擾更嚴重
Oriolus Traillii Ultra IEM System
A system, not merely an earphone.
The Oriolus Traillii Ultra IEM System approaches in-ear reproduction as a complete audio system rather than a collection of separate components. Instead of optimising the earphone and amplifier in isolation, the entire playback chain is conceived as a single, coherent acoustic instrument.
At its core is a dedicated three-way in-ear monitor, partnered with the DPA 10 — a purpose-built headphone amplifier incorporating a digital 3-way crossover and twelve independent amplification channels.
Together, they form a system designed to operate each driver under precisely controlled conditions, achieving a level of coherence and stability that conventional multi-driver IEMs often struggle to maintain.
Digital 3-Way Crossover × 12-Channel Independent Drive
Separate first. Drive with intent.
A 32-bit audio-dedicated DSP performs precise band-splitting before amplification, dividing the signal into low, mid, and high frequencies at the digital stage. Each band is then handled by its own analogue amplification circuit, resulting in twelve fully independent channels across left and right.
This architecture significantly reduces inter-band interaction while preserving phase integrity.
The outcome is not an exaggerated presentation, but one characterised by:
– Clear separation without artificial emphasis
– Stable, unforced spatial placement
– Low frequencies with depth and control
– High frequencies that extend naturally, without strain
Even as musical complexity increases, the soundstage remains composed and intelligible.
Dedicated Amplifier: DPA 10
Designed not for power, but for control.
The DPA 10 is not a general-purpose headphone amplifier.
It is engineered specifically for a three-way IEM architecture.
Key elements include:
– 32-bit digital 3-way crossover processing
– Twelve BUF634 buffer stages, one per channel
– OP-amp plus buffer topology for consistent stability
– Independent gain control for low, mid, and high bands
Rather than prioritising raw output, the design focuses on maintaining predictable electrical behaviour for each driver.
The sound is restrained and deliberate: clearly defined outlines, natural dynamic flow, and a sense of ease that avoids excessive forwardness.
Sound Signature
The Traillii Ultra IEM System does not aim to impress through immediacy or tonal exaggeration.
– Bass favors control and depth over sheer quantity
– Midrange presentation is dense, tangible, and grounded
– Treble is open and articulate, without edge
This balance supports extended listening sessions and allows musical structure, phrasing, and intent to emerge with clarity rather than force.
Intended Use and Listener Profile
This system is not positioned as a casual portable solution.
It is designed for listeners who value precision and consistency in in-ear monitoring, including:
– Dedicated home listening with a reference DAC
– Desk-based or stationary systems
– Recording and mix evaluation
– Classical, jazz, acoustic, and vocal-centric music
For those seeking to elevate the accuracy of in-ear reproduction beyond conventional multi-driver designs, Traillii Ultra offers a distinctly system-oriented approach.
Design Philosophy
The Traillii Ultra IEM System reflects over three decades of experience in acoustic design by Raoul Yu-Liang.
The objective was not to pursue immediacy or spectacle, but to align frequency balance, phase behaviour, and driving conditions with minimal compromise.
By combining measured performance with critical listening, the system treats the earphone not as an isolated transducer, but as part of an integrated signal path.
The emphasis remains on coherence, predictability, and musical integrity.
Traillii Ultra is not a product designed to compete on spectacle.
It is designed to let the music speak with precision.
The Oriolus Traillii Ultra IEM System begins with a simple question—not how to make an earphone sound impressive, but how to treat sound correctly. Three-way crossovers are nothing new, yet what sets this design apart is its refusal to compromise after the crossover point. By separating frequencies digitally, amplifying each band independently in the analogue domain, and optimizing conditions for every driver, the system adopts an architecture closer to reference loudspeaker design than conventional IEM practice. The intent is neither embellishment nor effect, but clarity, structure, and fidelity to the recording itself. In that sense, the Traillii Ultra is not a declaration of “better sound,” but a quiet, deliberate tool for listening more accurately.
