ULTRASONE is a headphone brand that was started in Germany. Recently they released the open-back monitoring headphones called the Signature FUSION Open Back.
In addition to the expansive sound characteristic of open-back headphones, this model achieves a good balance between realistic sound reproduction and a comfortable listening experience. In this review, I will introduce in detail various key features such as design, comfort, sound quality, cable specifications, and included accessories.
Contents:
Elegant Design and Comfortable Fit
First, the luxurious design really activates that feeling you get when you get a hold of these headphones for the first time.. The black base with gold accents gives a calm impression while also making a strong statement with its noticeable presence. The design is particularly appealing to users who want to stand out with a unique and high-quality design. Additionally, the comfort of wearing these headphones is exceptional. The ear pads are made from suede and it provides a fit that gently envelops the ears. Moreover, the headband incorporates ULTRASONE's unique FGC (Floating Gap Cushion) technology, which evenly distributes pressure on the head, ensuring that comfort is maintained even during long listening sessions.

Overwhelming Soundstage and Balanced Sound
The moment you start playing music, you’ll immediately notice the overwhelming soundstage. This model features 45mm titanium-plated Mylar drivers that deliver deep bass reproduction, which is unexpected from an open-back design. Despite the powerful low-end, the sound remains clear and tightly controlled without any muddiness, providing a high-resolution, crisp audio experience.
What’s particularly impressive is the three-dimensional soundstage created by ULTRASONE’s proprietary S-Logic 3 technology. It feels as though the performance is unfolding right in front of you, providing an immersive experience. When listening to live recordings or classical music, you can feel as if you’re inside a concert hall experiencing the music with an unparalleled sense of immersion.

Cable Design Considerations
In addition to the excellent sound quality, the design also takes usability into account. The headphones feature a 3.5mm 4-pole screw-lock connector, ensuring a stable and secure connection. The headphones also support balanced connections, allowing you to pair them with high-end DAPs (digital audio players) for further sound quality improvements.
These thoughtful design details highlight ULTRASONE’s commitment to providing professional-grade quality and it showcases the brand’s dedication to precision and performance.

Accessories and Warranty
The package includes a dedicated carrying case, ensuring that the headphones can be safely transported. Additionally, the model comes with a 2-year manufacturer warranty, which is a reassuring feature.
While professional-grade equipment often has shorter warranty periods, this model offers a solid warranty, allowing users to enjoy these headphones with peace of mind and reassurance with the extended period.

To Summarize
Open-back headphones are known for their expansive soundstage, but sometimes they can lack in bass power. However, the Signature FUSION Open Back overcomes this issue by providing both the wide soundstage characteristic of open-back designs and tight, punchy bass.
This model is especially well-suited for listeners who enjoy rock, pop, and jazz. The dimensionality of vocals and instruments stands out, and the sound is immersive and engaging.
Though these headphones come with a slightly higher price tag, the sound quality and comfort justify the cost. If you're considering an open-back headphone, it's definitely worth trying this model out.