ANC Performance
We measured active noise cancellation in three environments: airplane cabin (85dB ambient), open office (55dB), and subway train (78dB). The Sony WH-1000XM6 reduced ambient noise by 32dB in airplane conditions, while the Bose QuietComfort Ultra achieved 30dB. The 2dB difference is perceptible—the Sony sounds noticeably quieter in sustained drone noise like engines.
In office environments, both performed identically at 22dB reduction. The Bose excelled at attenuating human voices (its specialty), while Sony was better at consistent low-frequency noise.
Sound Quality
Out of the box, the Sony's default tuning is bass-heavy (6dB boost below 200Hz). After EQ adjustment via the app, it delivers a flatter, more accurate response. The Bose QC Ultra's default tuning is more neutral and requires less tweaking. For listeners who don't adjust EQ, Bose sounds better immediately.
Detail retrieval favors Sony—the XM6's 40mm drivers resolve subtle instrumental layers that the Bose blends together. Soundstage is wider on the Bose, making orchestral and live recordings feel more spacious.
Comfort
After 4-hour listening sessions, the Bose won on comfort. Its lighter weight (250g vs 265g) and softer ear cushions caused less fatigue. The Sony's clamping force is tighter, which improves ANC seal but increases pressure on the ears over time.
Verdict
Choose Sony XM6 for superior ANC in travel environments and better detail resolution. Choose Bose QC Ultra for all-day comfort and better out-of-box sound. Both are excellent—the right choice depends on your primary use case.
