Open-back headphones: what the open design changes

What the open grille does

A headphone driver pushes air from both faces of its diaphragm. The front faces your ear, inside the pads. What happens at the back decides the type. A closed-back seals it in a cup, where the trapped air pushes back on the diaphragm and resonates in ways the tuning then has to manage. An open-back lets it out through a grille, a mesh or a perforated cover, so the diaphragm moves against open air.

The grille is usually there to protect the driver while blocking as little as possible. On the HE1000se, HIFIMAN's Window Shade grille is described in its review as protecting the driver while keeping the cup wide open, so the sound escapes instead of bouncing back inside. The Arya Unveiled goes as far as removing the grille altogether, which its review says leaves the driver close to floating in free air, at the price of a bare driver that needs covering whenever it's put down. The closed-back explainer covers what the sealed alternative does with that rear air.

Why an open-back leaks both ways

An open back is an open acoustic path, so it works in both directions. Outside noise reaches your ears almost unchanged, and your music reaches the room. The review of the HIFIMAN HE1000se puts it bluntly: zero noise isolation for you and maximum sound bleed for everyone nearby.

At a normal listening level someone sitting beside you will hear what you're playing. On a train you'd have to turn the volume up to hear over the noise, which is bad for your hearing and annoys everyone around you. That makes an open-back the wrong tool for an office, a commute, a flight or a room where someone else is trying to sleep, and it rules one out near a recording microphone.

What it changes in the sound

Open-backs are widely heard as more spacious and more out-of-the-head than sealed designs, and removing the trapped air behind the driver takes away one source of coloration. Openness makes a large stage more likely without guaranteeing one, though. The HE1000se's review describes a huge, holographic, out-of-your-head stage, while the OLLO Audio X1, a studio open-back tuned flat, has a stage its review calls realistic and not impressively wide, with precise placement and a real sense of depth. Tuning, driver and pads shape the space as much as the back does, and the soundstage explainer goes through why headphones place sound where they do.

Bass without a sealed cup

The pads still close off the space between the driver and your ear, so a gap there, from glasses, hair or worn pads, still costs bass. How deep an open-back reaches varies widely with its driver and tuning. The HIFIMAN Sundara, an open-back planar, has sub-bass that its review hears sloping down from about 50 Hz while 20 Hz is still audible. The Sivga Luan rolls off below about 45 Hz, and the HIFIMAN HE400se lacks bass below 60 Hz.

Tuning sets the character as well. The Meze 105 Silva, a dynamic open-back, has a slightly forward mid-bass that its review credits with real physical punch, while the Arya Unveiled's review hears sub-bass that is about texture more than volume and warns bass lovers it may sound too polite out of the box.

Semi-open designs

Between open and closed sits a range of partly vented cups. The Sivga Luan is a good example: a layer of felt behind its metal grilles makes it semi-open, as its review explains. It still gets well out of your head and spreads wider than Sivga's closed-back models, with sounds presented mostly in front of you. Partial venting lands between the two sets of properties instead of escaping them, so expect some leakage and only a little isolation.

Open-back or closed-back: which suits you

Choose an open-back for listening at home in a quiet space, where a wide presentation and long sessions matter more than isolation. Open cups also tend to trap less heat against your ears, though the pads decide a lot of that. The room becomes part of the listening, too: a fan, a fridge or traffic outside sits under every quiet passage, so a calm room gets more out of an open-back than a busy one. If other people share your room, if you listen on the move, or if a microphone is running nearby, a closed-back will serve you better.

An open back describes where a headphone is meant to be used, and it doesn't make one headphone better than another on its own. The best open-back headphones guide ranks the open-backs reviewed here, from budget models to flagships.