Among the new generation of IEMs, the HiBy x F.audio – Project Ace Special Edition Review (SE) is the review of an unit which stands out for its precision and technical prowess. Unlike the original Project Ace, which has a warm and musical character, the SE model leans towards a more analytical and detail-oriented approach. With exceptional clarity and instrument separation, it particularly excels in complex compositions. While the first model retains its romantic tonality and energetic bass, the SE version offers a more disciplined and controlled presentation.
disclaimer: This unit is the loaner from Hiby, in the name of Audio Geeks and its Turkey tour. Thanks to both parties for the HiBy x F.audio Project Ace Special Edition Review
Design and Comfort
The HiBy x F.audio – Project Ace Special Edition closely resembles the original model in aesthetics but has undergone fine-tuning in sound, giving it a distinct identity. The beryllium-coated diaphragm and magnesium-lithium alloy domes enhance its sensitivity.
12mm Dynamic、Mg & Li Alloy Dome、Be-plated Diaphragm、High Magnetic Core、Exclusive T.B.A.C.、CNC Carving、Ergonomic Wearing、Coaxial Balanced Shielding Cable、8 Core Cooper & Silver、Litz Type5 Coaxial Wire、4Pin-lock Adapter、0.78 Detachable
The proprietary TBAC air pressure management system helps regulate the dynamic range, delivering a more neutral sound. It sits comfortably in the ear, and passive isolation is above average.
Impact of Magnesium and Lithium in Sound Reproduction
One of the game changer innovations in the Project Ace SE is its magnesium-lithium alloy domes, which contribute significantly to its sonic performance. Magnesium and lithium are chosen for their combination of strength and lightness, allowing the driver to respond with greater speed and accuracy. This results in a faster transient response, meaning percussive elements and quick dynamic shifts are rendered more precisely.
The lightweight nature of these materials helps reduce unwanted resonance, maintaining a clean and distortion-free playback like the Simgot EA-500 MG. Compared to traditional driver materials, this alloy enhances both midrange articulation and treble extension, making SE’s instrument separation sharper and more defined. This effect is particularly noticeable in high-energy electronic and orchestral tracks, where every nuance and micro-detail is captured with striking clarity. However, this enhanced resolution comes at the cost of warmth, making the SE model lean slightly towards a more clinical sound signature.
Sound Performance of HiBy x F.audio – Project Ace Special Edition
The first noticeable aspect of the HiBy x F.audio – Project Ace Special Edition is its three-dimensional soundstage and outstanding clarity. In complex tracks like Haggard – The Day Heaven Wept, the instrument separation is remarkably precise. The transparency is high, and the treble exhibits a crisp brightness. However, in the uppermost frequencies, there is a slight percussive airiness that stands out. With Alan Parsons Project – Eye In The Sky, the SE delivers an authentic ’80s nostalgia, providing a sense of spaciousness and precise instrument layering. Even when electric guitars briefly take center stage, there’s a distinct bluesy undertone in the presentation.
When it comes to electronic music, the Ace SE is undoubtedly impressive. In Bass Nipple, a fast-paced, multi-layered track, each effect is clearly defined, and nothing overlaps. The level of separation is superior to most competitors. Listening to Toto – Africa, micro details emerge effortlessly—digital trombones and subtle nuances are more pronounced than in previous IEMs. However, using a BAL connection, I noticed a slight compression in the treble’s spatiality.
Comparison: Project Ace vs. Project Ace SE
Project Ace has a warm and musical character, whereas the SE version offers a more analytical and detail-focused presentation. The original model excels in jazz and symphonic rock, providing a wide soundstage with a dark background, pulling the listener into an immersive experience. Meanwhile, the SE delivers a cleaner, more detailed, and more structured sound. The SE’s treble is sharper and more transparent, while its instrument separation and soundstage precision are more refined. However, this technical prowess may feel sterile or cold to some listeners. The original Project Ace, with its warm vocal presentation and fuller bass, might be more appealing to those who prioritize musicality over technical accuracy.
In terms of bass performance, the Project Ace delivers a fuller, more body-packed experience, while the SE model keeps bass tight and controlled. In rock and electronic genres, the original model’s low frequencies are more intense and immersive, whereas the SE offers a faster, cleaner, and more delineated bass response. In Bass Nipple, SE’s clarity stands out, yet the original model’s powerful bass hits add an enjoyable depth to electronic music. Additionally, the original model softens the treble slightly, making it more listener-friendly, while the SE’s treble remains bright and well-defined.
Regarding vocals and spatial positioning, the differences are evident. The original Project Ace presents vocals with warmth and a slightly recessed placement in the soundstage, whereas the SE brings vocals more forward, making them clearer and more spacious. In The Day Heaven Wept, the SE renders more noticeable gaps between instruments, while the original version offers a more cohesive, blended experience. The SE prioritizes clarity and separation, leaning toward a reference-style listening experience, while the original model’s dynamic transitions create a more emotionally engaging musical atmosphere. The choice ultimately depends on the listener’s preferences—those seeking pure detail and precision will favor the SE, while those preferring warmth and musicality will appreciate the original model more.
Pros & Cons
✅ Pros:
• Outstanding instrument separation and micro-detail retrieval
• Crisp and transparent treble
• Technically controlled and well-balanced sound
• Excellent performance in electronic and complex music genres
• TBAC air pressure management provides a comfortable listening experience
❌ Cons:
• Cooler and more analytical tuning, which may not suit those who prefer a warm and musical presentation
• Some treble frequencies may feel a bit aggressive
• Highly controlled dynamic transitions might reduce the fun factor in some genres
Conclusion of HiBy x F.audio – Project Ace Special Edition Review
The HiBy x F.audio – Project Ace Special Edition Review showing an ideal choice for those who prioritize pure detail and instrument separation. Its clarity and treble extension make it particularly impressive for complex compositions and electronic music. However, if you seek a dynamic and engaging listening experience, be aware that SE takes a more technical approach compared to the original Project Ace. While the first model embraces a warmer and more expressive sound, the SE is disciplined, structured, and precise. Both are strong performers in their respective categories, and the decision ultimately comes down to individual listening preferences.