I put these on, plugged the USB-C cable into my laptop, and played a Norah Jones track I have heard a thousand times. The piano was sitting in a room. That is a useless sentence and also the only honest way I can describe what Focal has done here. Most ANC headphones, even the expensive ones, render music as a flat plane in front of your face. The Bathys renders depth. Once you hear it you cannot un-hear it, and once you cannot un-hear it the price starts to make a kind of awkward sense.
The USB-C path with an onboard DAC is the feature. It bypasses Bluetooth compression entirely, it does not require a separate amplifier, and it is the cleanest digital signal I have gotten into a wireless headphone without spending another four figures on outboard gear. On familiar acoustic recordings the difference between the USB path and aptx Adaptive is small but consistent — more space between instruments, slightly tighter low end, vocals that sit a little further forward. It is the kind of improvement an audiophile will notice in the first ten minutes and a casual listener might never spot.
Build is the part the photographs do not capture. The yokes are magnesium, the band is aluminum, and the whole thing has the cold-to-the-touch density that French hi-fi brands seem to be born knowing how to engineer. After three months of daily use the finish has not picked up a scratch I can find, and the pads are the same kind of perforated leather Focal uses on its open-back home audiophile lineup.
The noise cancellation, though, is honestly only okay. It cuts roughly 75 percent of perceived low-frequency rumble, which is enough for an open-plan office and adequate for a flight but visibly behind the Bose QC Ultra and the Sony XM5 in the same room. If you bought the Bathys for the quiet, you bought the wrong headphone. If you bought it for everything else, the ANC is good enough that you will not think about it.
At 350 grams the weight is the other catch. On a four-hour flight I felt it on my neck before the battery felt it in the cells, and the 31 hours I measured with ANC on is more than enough for a transatlantic. The illuminated Focal logos on the outside of the cups are tasteful but visible, and the headphones require battery power even with the 3.5mm cable plugged in, which is the kind of quirk Focal could fix and apparently has decided not to.
The price is the conversation. $699 is a lot of money for a headphone, and it is harder to defend than the Bowers Px8 because Focal has not invested as heavily in the look-at-me leather. What Focal has invested in is the sound. If sound is what you came for, the Bathys is the most honest premium ANC headphone on the market right now. If you came for noise cancellation specifically, a Bose QC Ultra is half the money and better at the job. If you came for ecosystem integration, an AirPods Max is the right answer.
Verdict: Buy the Bathys if you already own a real DAC and you have been waiting for a wireless headphone that does not throw away the signal. Skip it if you came for quiet or for Apple.