Model: U4sby 64 Audio
- Driver One
- Driver Two
- Driver Three
Introduction
IEM Description
The U4s is a premium 4-driver hybrid IEM, combining one dynamic driver, two balanced armatures, and a proprietary tia high-driver. It incorporates several patented technologies, including tia® for tubeless, open high-frequency performance, Apex® modules (mX, m15, m20) for pressure relief and soundstage expansion, and LID® for consistent tuning across sources. Tuned for balance, it delivers punchy sub-bass, natural mids, and airy highs without fatigue. The sleek slate-blue aluminum shell, inspired by luxury watches and meteorites, houses an ergonomic design and a low-impedance silver-plated cable for clean signal flow. Ideal for audiophiles seeking refined sound and tech-forward tuning flexibility.
The driver configuration is Tribrid. It consists of .
Brand Information
This US-based company specializes in designing and manufacturing high-end IEMs, utilizing advanced technology and precision craftsmanship to create accurate, detailed sound reproduction. Founded by Audeze co-founder Andrew Freeth, it has become a prominent player in the audio industry.
Technical/Other Specifications
| Drivers | |
|---|---|
| Driver Types | 1 tia High Driver – 1 High-Mid Driver – 1 Mid Driver – 1 Dynamic Low Driver |
| Crossover | Integrated 4-way Passive Crossover |
| Audio Performance | |
| Sensitivity | 107 db/mW |
| Frequency Response | 10hz – 20kHz |
| Impedance | 11 Ω |
| Build & Design | |
| Customizable | No |
| Cable | |
| Connectors | 2-pin 0.78mm cable; 3.5mm |
| Accessories | |
| Eartips | Wide-bore silicone tips s/m/l, Spinfit silicone tips s/m/l, Foam tips s/m/l |
General Tags
Here you can add tags out of the tags library. They will be used to enable enhanced filtering on the search and to provide more information about an IEM. When a tag is set, it can not be removed anymore - only I can remove them in the database.
Highlevel & Tierlist
Overall, Packaging & Quality
This section offers a broad look at the general quality, packaging, and everyday usability of the IEM—beyond just the sound. From build integrity and comfort to cable quality and included accessories, each aspect is carefully rated to help you understand the overall experience. Whether you're a casual listener or a gear enthusiast, this overview gives insight into what it’s like to unbox, wear, and live with the IEM on a daily basis. Think of it as the foundation before we dive deeper into performance.
Sound Characteristics
Ratings sound, tonal signature & target group
This section dives into how the IEM sounds — not just in technical terms, but also in how it feels to the listener. Ratings here reflect detailed impressions across a wide range of sonic aspects, from sub-bass rumble to treble sparkle, from note weight to soundstage width. In addition, the Tonal Signature slider helps visualize the IEM’s position between opposing characteristics like dark vs. bright or smooth vs. crisp — giving a quick feel for its personality. Lastly, the Target Group graph shows who this IEM is best suited for: bassheads, treble lovers, vocal fans, or those seeking balance. Combined with genre recommendations, this section helps you understand whether the IEM fits your taste — before you even hit play.
Sound Analysis
Sound Characteristics
Tonal Signature
Target Group
Comments
Get in touch with the community
COMMENTS
No comments yet..
0 / 3.000