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.
