If you want wireless over-ear convenience for gym commutes and everyday listening, choose Focal Radiance; if you need a wired, open-air electrostatic setup for focused listening, choose Koss ESP/95X. Neither is a sweatproof sports headphone: the Focal has Bluetooth and active noise cancellation, while the Koss is wired and open-air. For the gym, I’d favor the Focal’s more self-contained design, but neither product’s listed features establish sweat resistance.
Focal Radiance vs Koss ESP/95X at a Glance
• Koss ESP/95X: Electrostatic drivers and an 8–35,000 Hz frequency range suit focused listening; its trade-off is a wired, open-air design rather than a portable, noise-isolating setup.
• Focal Radiance is for: listeners who want wireless flexibility, touch control, and active noise cancellation in an over-ear headphone.
• Koss ESP/95X is for: listeners prepared to use a wired headphone and E/90 Energizer to explore an electrostatic, open-air design.
• For gym use: Focal Radiance is the more practical of these two on connectivity alone, but neither is specified for sweat or exercise.
Focal Radiance is a closed-back, over-ear Bluetooth headphone with active noise cancellation and touch controls. Bluetooth 5 and a stated wireless range of 10 meters give it more freedom from a cable than the Koss. It also has a 3.5 mm headphone jack, so its connectivity is not limited to wireless listening. Its 40 mm dynamic drivers and listed frequency range of 20 Hz–20,000 Hz provide useful points of comparison, but those figures alone cannot establish how it will sound to every listener.
The design details suggest a headphone intended for deliberate everyday listening more than a dedicated sports session. It weighs 1.1 kg according to the supplied item information, and its over-ear placement, aluminum enclosure, copper finish, and leather carrying case all point to a substantial, case-friendly package. Active noise cancellation may appeal when you want to reduce surrounding sound, while touch controls offer a way to manage listening without relying solely on a cable. Neither feature makes it a gym-specific product, and the information provided does not list water or sweat resistance.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-20 · 7 min read · Independent comparison
I’d consider Focal Radiance if you want wireless listening with active noise cancellation and the option of a wired connection. For a gym routine, the Bluetooth connection may be more convenient than a cable, but its over-ear build and lack of a stated sweat rating are reasons to be cautious. It should not be treated as the best sweatproof sports earbuds for gym use: it is an over-ear headphone, and sweat protection is not specified. The same limitation applies if you are searching for the best sleep headphones for gym; its listed design is over-ear, not a sleep-specific form.
Who should skip it: Skip Focal Radiance if a documented sweat-resistant design, an open-air fit, or a lightweight exercise-focused build is essential.
Koss ESP/95X is an over-ear, open-air headphone built around electrostatic drivers. Its stated frequency range is 8–35,000 Hz, wider on paper than Focal’s listed 20 Hz–20,000 Hz range. That difference is a specification, not a guarantee that one headphone will sound better to every person. Koss positions this model around detailed listening, and the electrostatic design is its central distinction from Focal’s dynamic drivers.
The practical setup is a major part of the choice. The ESP/95X is wired, with a 3.5 mm jack, and the product description says an E/90 Energizer is needed to bring out the electrostatic drivers’ full potential. That makes it a more involved choice than simply pairing a Bluetooth headphone with a device. Its open-air design also means it is not the natural pick when you want active noise cancellation or a more enclosed listening experience. Pivoting ear cups and an adjustable headband are listed, along with a leather carrying case; those details are relevant for fit adjustment and storage, not proof of exercise durability.
I’d look at Koss if your priority is a wired electrostatic headphone for focused listening and you are comfortable with the associated Energizer setup. Its open-air construction can be appealing when you do not want a closed-back listening experience, but it is a poor match for a noisy gym where blocking distractions matters. It is also not the best sweatproof open ear headphones for gym based on the available specifications: open-air describes its acoustic design, not resistance to sweat or water.
Who should skip it: Skip Koss ESP/95X if you need Bluetooth, active noise cancellation, or a simple headphone-only setup without an Energizer.
Side-by-Side: Which Should You Choose?
• Best for wireless convenience → Focal Radiance. Bluetooth 5 and a stated 10-meter range make it the only one of the pair with listed wireless connectivity.
• Best for a wired electrostatic setup → Koss ESP/95X. It uses electrostatic drivers and is described as needing the E/90 Energizer for its full potential.
• Best for gym practicality between these two → Focal Radiance, with reservations. Bluetooth avoids a headphone cable during movement, but no sweat-resistance claim is provided.
• Best for open-air listening → Koss ESP/95X. Choose it if you specifically want an open-air over-ear design rather than a closed-back headphone.
• Best for touch controls → Focal Radiance. Touch control is listed for the Focal; the Koss information does not specify touch controls.
• Best for a wider stated frequency range → Koss ESP/95X. Its listed range is 8–35,000 Hz versus 20 Hz–20,000 Hz for Focal, though range alone does not settle sound quality.
• Best for avoiding a dedicated Energizer setup → Focal Radiance. The Koss product description links its full electrostatic performance to the E/90 Energizer, while Focal lists Bluetooth and a 3.5 mm jack.
Before choosing either model for exercise, separate connectivity from durability. A wireless connection can reduce cable fuss, but it does not tell you whether a headphone can handle sweat. The specifications provided for Focal Radiance do not state a sweat- or water-resistance rating, and the Koss information does not provide one either. If your gym sessions involve heavy sweating, that missing information matters more than the Bluetooth or driver type.
Fit and listening environment also deserve attention. Both products are over-ear headphones, but their acoustic designs differ: Focal is closed-back and includes active noise cancellation, while Koss is open-air. That distinction matters if you want to reduce surrounding sound or, instead, prefer an open design. It does not make either one universally safer or more suitable for every workout.
Then consider how much setup you want. Focal offers Bluetooth 5 and a 3.5 mm jack. Koss is wired and its description calls for an E/90 Energizer to get the full potential of its electrostatic drivers. If your main goal is straightforward listening at the gym, that difference weighs heavily toward Focal. If your priority is a wired electrostatic listening arrangement at home, Koss is the more purpose-built choice.
Finally, do not use frequency range as a shortcut for a sound-quality verdict. Koss lists the broader range, but the figure does not by itself tell you how the headphones will sound with your music, how comfortable they will feel, or whether they suit your routine. Match the design and connection to how you actually plan to listen.
I’d choose Focal Radiance between these two for gym use because Bluetooth and active noise cancellation make it the more practical option for a cable-free routine. That is a relative recommendation, not a claim that it is sweatproof; its listed information does not establish sweat resistance. If gym sessions are the priority, I would verify that limitation before buying. For focused listening with a wired electrostatic setup, I’d choose Koss ESP/95X instead.
FAQ
Focal Radiance is the more convenient of the two for movement because it supports Bluetooth 5, while Koss is wired. Neither product’s supplied information specifies sweat resistance, so neither can be confirmed as suitable for sweaty workouts.
No. Koss ESP/95X is listed as wired, with a 3.5 mm jack. Its description also says the E/90 Energizer is needed to reach the full potential of its electrostatic drivers.
Yes. Active noise cancellation is listed for Focal Radiance. Koss ESP/95X is described as open-air, and the supplied information does not list active noise cancellation for it.
The specifications do not establish a universal sound-quality winner. Koss lists electrostatic drivers and an 8–35,000 Hz range; Focal lists 40 mm dynamic drivers and a 20 Hz–20,000 Hz range. Those figures describe different designs, but they cannot alone determine which will sound better to you.
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