Closed-back headphones have always been a practical choice. They isolate you from the outside world, keep your music private, and work well in almost any listening environment. But for many audiophiles, they come with a compromise: the soundstage often feels smaller and less natural than what open-back designs can deliver.
The new Final DX4000CL aims to change that perception.
With this model, the Japanese headphone specialist is trying to blur the line between closed and open designs. The DX4000CL combines the isolation and bass control of a closed headphone with an acoustic architecture designed to deliver a surprisingly open and spacious presentation. At the heart of this concept is a newly developed dynamic driver, supported by carefully engineered internal acoustics and premium materials.
Final DX4000CL closed-back headphones featuring a newly developed 40 mm dynamic driver with a paper-carbon composite diaphragm.
A New Chapter in the DX Series
The DX4000CL joins Final’s DX Series as a model positioned right between the existing variants in the lineup. The goal is clear: create a closed-back headphone that keeps the practical benefits of isolation while offering the kind of spacious, natural sound usually associated with open designs.
For serious hi-fi listeners using dedicated headphone amplifiers or high-end portable players, that combination could make the DX4000CL particularly appealing. It promises a listening experience that remains controlled and balanced rather than artificially boosted in the bass or overly colored across the spectrum.
The DX4000CL combines closed-back isolation with an acoustic design aimed at delivering a surprisingly open and spacious soundstage.
Newly Developed 40 mm Dynamic Driver
At the center of the DX4000CL sits a newly engineered 40 mm dynamic driver. Final uses a composite diaphragm made from paper and carbon fiber—two materials chosen for their complementary acoustic properties.
Paper has long been valued in loudspeaker design for its natural internal damping, helping reduce unwanted resonances. Carbon fiber, on the other hand, increases structural rigidity. Together they form a diaphragm designed to remain both stable and responsive during complex musical passages.
Premium materials and a precision-engineered internal diffuser structure help control resonances inside the ear cup.
The driver also uses a free-edge diaphragm structure, meaning the membrane avoids traditional reinforcement ridges around its perimeter. This design allows the diaphragm to move more uniformly, which can improve transient response and reduce distortion.
Internal Acoustics Designed Like a Mini Listening Room
Closed-back headphones often struggle with internal reflections. Sound waves bouncing inside the ear cup can create resonances that color the sound or reduce spatial realism.
Final tackles this with an internal diffuser array built into the rear chamber behind the driver. Instead of smooth internal surfaces, the housing features differently shaped rib structures that scatter reflections in multiple directions.
The concept is similar to acoustic diffusers used in recording studios and listening rooms—only scaled down dramatically and integrated directly inside the headphone. The result should be cleaner reproduction and a more stable stereo image, even during dense or complex music passages.
Thick memory-foam ear pads improve comfort while optimizing the distance between the driver and the listener’s ear.
Comfort plays a major role in the DX4000CL’s design as well. The headphones use particularly thick ear pads—around 30 mm—made from memory foam and synthetic leather. This not only improves long-term wearing comfort but also optimizes the distance between the driver and the ear, which can influence soundstage and tonal balance.
The ear pads are also user-replaceable without tools, and the headphone’s construction avoids excessive glue. Instead, Final uses O-rings and precision screws to make the structure easier to service over time.
Connectivity is handled through a detachable silver-coated cable that terminates in a 4.4 mm Pentaconn balanced connector, a standard widely used with high-end headphone amplifiers and portable audio players. A 6.3 mm adapter is included for traditional hi-fi setups.
The detachable silver-coated cable terminates in a balanced 4.4 mm Pentaconn connector for high-end headphone amplifiers and portable players.
Designed for Serious Listening
Weighing around 375 grams without the cable, the DX4000CL remains substantial but manageable for a headphone aimed at reference-level performance.
Final plans to release the model in Q2 2026 with a suggested retail price of €999, placing it firmly in the upper tier of audiophile closed-back headphones.
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