We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-02 · 5 min read · Independent comparison
If you want a wireless, noise-cancelling luxury closed-back you can wear on a plane or at your desk with no extra gear, choose Focal Radiance; if you need reference-grade electrostatic clarity for serious critical listening at home, choose Koss ESP/95X. They sit at opposite ends of the headphone world, so the right pick comes down to how and where you actually listen.
• Focal Radiance — biggest strength: a closed-back, over-ear design with active noise cancellation, Bluetooth wireless and touch controls, so it works untethered anywhere.
• Focal Radiance — biggest trade-off: it runs on Bluetooth 5 with a 10-meter range and a 3.5 mm jack, so wired purists get a wireless-first design rather than a dedicated desktop chain.
• Koss ESP/95X — biggest strength: an electrostatic driver with an 8–35,000 Hz range and an open-air design, aimed at detail and accuracy rather than convenience.
• Koss ESP/95X — biggest trade-off: it's wired only and needs the included E/90 Energizer to drive the electrostatic drivers, so it lives at a desk, not in a bag.
• Who each is for: pick the Focal Radiance if you want one premium headphone for travel, commuting and casual listening; pick the Koss ESP/95X if you want a dedicated home listening station.
The Radiance is a closed-back over-ear headphone built around a 40 mm dynamic driver with a 35-ohm impedance and a 20 Hz–20,000 Hz frequency range. That's a conventional, well-understood recipe, and Focal leans into the "lifestyle flagship" angle here: aluminum enclosure, leather-and-aluminum carrying case, copper colorway, and a design language tied to the Bentley theme. This is a headphone meant to be seen and carried, not just listened to.
Where it earns its keep is flexibility. It's wireless over Bluetooth 5 with a 10-meter range, and it adds active noise cancellation with touch controls. So you can pair it to a phone or laptop, cut down cabin or office noise, and tap to change tracks without reaching for a cable. There's also a 3.5 mm jack if you'd rather go wired. For someone who wants a single high-end headphone to cover flights, commutes, open-plan offices and evening listening, that combination is genuinely hard to beat.
Who should skip it? If your goal is maximum resolution for critical listening — the kind of listening where you sit still and dissect a recording — the Radiance's wireless-first, noise-cancelling design isn't built for that job. It's an all-rounder, not a specialist. And if you prefer an open, airy presentation for long home sessions, a closed-back ANC headphone is the wrong tool.
The ESP/95X is the opposite philosophy. It's an electrostatic, open-air over-ear headphone with a frequency response of 8–35,000 Hz — a range that reaches well below and well above the Radiance's 20 Hz–20,000 Hz. The electrostatic driver, proprietary diaphragm coating and damping materials are all aimed at one thing: flat, full-range reproduction with clarity and accuracy. Koss says each unit is precision-tuned and hand-assembled in Milwaukee, Wisconsin, and the specs back the intent — this is a reference-oriented design.
Comfort and build are clearly considered too. At 353 g it's genuinely light for a full-size headphone, with pivoting ear cups, an adjustable headband and premium velour-wrapped cushions for long sessions. The Midnight Blue colorway, leatherette cushions and steel acoustical grills give it a classic, technical look. A leather carrying case is included to protect the headphones, the E/90 Energizer and the cables.
Who should skip it? Anyone who wants wireless. The ESP/95X is wired only, via a 3.5 mm jack, and electrostatic drivers require the included E/90 Energizer to reach their potential — that's a desktop setup, not a pocketable one. The open-air design also means it leaks sound in and out, so it's a poor fit for noisy environments, commuting or shared spaces. And you get a limited lifetime warranty, which suggests Koss expects this to be a long-term home fixture rather than a travel accessory.
• Best for wireless freedom → Focal Radiance. Bluetooth 5, a 10-meter range and touch controls mean no cable required.
• Best for noise control → Focal Radiance. It's the only one of the two with active noise cancellation.
• Best for critical, reference listening → Koss ESP/95X. Electrostatic drivers plus an 8–35,000 Hz range put accuracy first.
• Best for commuting and travel → Focal Radiance. Closed-back, wireless and noise-cancelling; the leather-and-aluminum case suits a bag.
• Best for a dedicated home listening station → Koss ESP/95X. The wired E/90 Energizer setup is designed to stay put.
• Best for long, fatigue-free sessions at home → Koss ESP/95X. At 353 g with pivoting ear cups and velour cushions, comfort is clearly a priority.
• Best for open, airy sound → Koss ESP/95X. The open-air design trades isolation for spaciousness.
• Best for one-headphone-does-everything → Focal Radiance. Wireless, wired, ANC and touch controls cover the most scenarios.
If I could only own one, I'd buy the Focal Radiance. In my opinion, its mix of closed-back ANC, Bluetooth 5 wireless, touch controls and a 3.5 mm wired option makes it the more useful headphone for most people's real lives — flights, offices, sofas, late-night listening. The Koss ESP/95X is the more specialized instrument, and if you want electrostatic accuracy in a dedicated home setup, it's the better choice for that single purpose. But as an all-rounder, the Radiance wins for me.
FAQ
Yes. It's a wired electrostatic headphone that requires the included E/90 Energizer to drive the drivers properly — plan for a desktop setup.
The Koss ESP/95X, at 8–35,000 Hz, versus the Focal Radiance at 20 Hz–20,000 Hz. The Koss reaches lower and higher on paper.
The Focal Radiance. It's wireless, noise-cancelling and closed-back, while the Koss ESP/95X is wired, open-air and designed to stay at a desk.
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