Wireless Earbud ANC Isolation — Five Pairs on a HATS Rig

Manufacturer ANC claims ("up to 2× quieter") are unverifiable marketing. We measured five 2026 flagship earbuds on a GRAS 45CA HATS rig with controlled pink noise.

Setup

• GRAS 45CA HATS with KB5000 anthropometric pinna
• Pink noise at 75 dB SPL ambient
• Best of three fits per pair (silicone tips selected by manufacturer guide)
• Measured passive + active attenuation in 1/3-octave bands

Total attenuation by frequency (dB, higher = better)

What the numbers mean

Low-frequency rejection is where active noise cancellation actually does work — passive isolation (the silicone tip alone) handles everything above ~2 kHz on its own. ANC's job is the sub-2 kHz band where physical sound waves are long enough to be hard to block passively but short enough to invert with a microphone-and-driver feedback loop. The Bose QC Ultra 2 leads at 100 Hz by 3 dB over AirPods Pro 3 — subjectively very noticeable on aircraft cabin noise (engine drone sits at 60–100 Hz) and HVAC systems.

The Pixel Buds Pro 2's lower scores are partially a fit issue — the smaller nozzle geometry seats less deeply on the HATS pinna than the larger AirPods Pro 3 or Bose tips. Real-world results vary more by individual ear canal geometry than for over-ear headphones, where the cup-clamp dominates. If the Pixel Buds Pro 2 fit your ears well, the 4 dB gap may narrow to 1–2 dB in practice.

Why HATS measurements understate real performance

A HATS rig is a rigid silicone pinna and ear canal. Real human ear canals are warm, slightly compressible, and individual to each user. The bud-to-canal seal in a real ear is often better than on a HATS — so absolute ANC numbers tend to be 2–4 dB conservative. Comparative numbers between buds are valid; absolute "this bud blocks 31 dB" is a lower bound.

ANC vs transparency mode

Every pair in the test includes a "transparency" or "ambient" mode that uses external mics to pass through environmental sound. We rated transparency naturalness on a 1–10 scale (10 = "forgot you're wearing buds"):

• Bose QC Ultra Earbuds 2: 9 (most natural)
• AirPods Pro 3: 8.5
• Sony WF-1000XM6: 8
• Pixel Buds Pro 2: 7.5
• Nothing Ear (3): 6

Bose's "Aware Mode" remains the industry leader in transparency naturalness — closest to the actual unprocessed sound.

Wind handling

A real-world failure mode for ANC: wind on the external mics creates audible noise. We tested with a 12 km/h fan at 30 cm:

• Bose QC Ultra: best (digital wind-noise reduction handles it)
• AirPods Pro 3: very good
• Sony WF-1000XM6: good
• Pixel Buds Pro 2: moderate (audible wind buffeting at full ANC)
• Nothing Ear (3): poor

For cyclists, runners, or coastal commuters, wind handling matters as much as raw ANC depth.

Battery cost of ANC

ANC adds roughly 30–40% to per-charge consumption. Battery numbers per charge with ANC on (manufacturer claim vs our measured):

Pairing matters

The codec gap between AirPods Pro 3 on iOS and Pixel Buds Pro 2 on Android (see our codec & latency lab) is a bigger end-to-end audio quality factor than the 4 dB ANC gap. ANC is one input to perceived sound quality; codec, fit, and ecosystem integration combine to outweigh it.

See our AirPods Pro 3 vs Pixel Buds Pro 2 for the full head-to-head, or the best wireless earbuds 2026 guide for the broader category.