Magnesium, and Nothing Diluting It
Two letters carry the whole argument. MG names the material Focal reserves for reference-grade drive units, and the Focal Bathys MG apply that material without compromise — a 40mm dome of pure magnesium, pressed into the ‘M’ profile and manufactured in Focal’s Saint-Étienne workshops. Magnesium is exceptionally light and exceptionally well damped, a combination that lets a diaphragm start and stop with unusual decision. Dynamics arrive intact. Detail survives complexity. The tonal signature stays level rather than flattering.
A Dome Borrowed from the Reference Range
The lineage runs directly to the Clear MG, the open-back model where Focal first proved what a magnesium diaphragm could do at this scale. Bringing that dome into a closed, wireless design meant rethinking everything around it: the inner grilles of the earcups follow the curvature of the driver rather than sitting flat, preserving high-frequency accuracy that a conventional grille would blur. Little of this is visible. All of it is audible on material with fine treble texture — brushed cymbals, massed strings, the decay of a struck piano note.
Bass That Starts Lower
The frequency response of the Focal Bathys MG runs from 10Hz upward, a figure that matters less as a number than as a quality of foundation. Organ pedal notes and synthesised sub-bass arrive as pressure rather than as suggestion, and the low end stays taut instead of loosening into warmth. Above that, harmonic distortion remains below a fifth of one percent through the critical midband, which is why voices sit forward and unstrained even at travelling volumes.
Three Ways to Meet the Silence
An array of eight microphones reads the ambient field and generates the inverse, and three settings decide how far that correction goes. Silent draws the deepest hush, suited to cabin noise at altitude. Soft removes low rumble while leaving the room audible. Transparency admits the world entirely, so a conversation or a boarding announcement arrives without lifting the headband. The same microphone array handles calls through Clear Voice technology, isolating speech from whatever surrounds the wearer.
The Cable Option: USB-DAC Listening
A short move of the switch converts the Focal Bathys MG from a wireless design into a wired one. Connected by USB-C, the internal converter accepts high-resolution audio directly and bypasses Bluetooth compression completely — an amplifier and converter built into the earcups rather than borrowed from the source. Over the air, Bluetooth 5.2 with aptX Adaptive handles the everyday connection, multipoint holds two devices at once, and Google Fast Pair removes the usual ceremony from the first introduction.
Sound Shaped Around Your Own Hearing
The Focal & Naim application adds a layer of tailoring rarely offered at this level. A graphic equaliser holds saved personal curves, and those settings persist whether the connection is Bluetooth, jack or USB-DAC. The integrated Mimi hearing test goes further, building a profile of how each ear responds across the frequency range and adjusting reproduction to match. The test takes roughly two minutes, runs once, and stores the result in the headphones themselves.
Chestnut and Graphen Grey
Two finishes are offered, and both follow the engineering rather than fashion. Chestnut takes the warm copper tone of the Clear MG into portable form, a colour that reads as considered rather than loud. Graphen Grey is understated and mineral, closer to instrument than accessory. A magnesium and aluminium yoke keeps the 350-gram frame light and rigid, a genuine leather headband spreads the load across the crown, and memory-foam earpads detach on six clips when replacement is due. The backlit flame logo glows or stays dark, as preferred.
Arrange a Listening at Audio Lounge
Specifications describe the Focal Bathys MG; a quiet room settles the matter. Few wireless headphones are built around driver material drawn from a manufacturer’s reference range, and fewer still are assembled in the workshops that produce it. To hear what the Focal Bathys MG headphones do with familiar recordings — and to compare Chestnut and Graphen Grey in hand — enquire with Audio Lounge to arrange a demonstration at the Wigmore Street showroom.
About Focal
Focal was founded in 1979 in Saint-Étienne, France, by engineer Jacques Mahul, and began as a maker of loudspeaker drive units before growing into one of the most respected names in high-fidelity sound. Almost five decades on, Focal still designs and manufactures drivers in France — from the flagship Utopia loudspeakers to the studio monitors found in mastering rooms worldwide — and that loudspeaker discipline shapes every Focal headphone. Under the VerVent Audio group, Focal works alongside British electronics marque Naim Audio, a partnership expressed in the shared Focal & Naim application. Explore the wider range on our Focal brand page or browse headphones at Audio Lounge.
