I couldn't find this last night. But I mentioned that the sound isolation or the cancelling would be within 30 dB to 40 dB off my memory. I have located some properly conducted test results and here they are for your reference.
Noise cancelling quality.
- Sony WH-1000XM3: -29.9 dB
- Bose 700: -27.56 dB
- Bose QuietComfort 35 Series II: -27.01 dB
- Shure SE215: -25.62 dB
- Bose QuietComfort 25: -25.26 dB
- Bose QuietComfort 20: -24.42 dB
- TaoTronics TT-BH060: -23.2 dB
- Beats Solo Pro: -23.18 dB
- Apple AirPods Pro: -23.01 dB
- Bowers & Wilkins PX7: -22.58 dB
- Sennheiser Momentum 3: -22.57 dB
- Mpow H10: -21.81 dB
Test results based on Bass, Mid, and Treble for each model. (sorted with most blocking Bass first)
- Bose QuietComfort 20: -23.88, -20.86, -28.06 dB
- Sony WH-1000XM3: -23.03, -27.24, -39.7 dB
- Bose QuietComfort 35 Series II: -19.65, -24.92, -36.85 dB
- Apple AirPods Pro: -19.56, -21.82, -27.8 dB
- Mpow H10: -18.66, -22.01, -25.1 dB
- Sennheiser Momentum 3: -18.43, -14.17, -34.29 dB
- Bose QuietComfort 25: -17.49, -26.05, -33.1 dB
- Bose 700: -17.32, -24.67, -41.24 dB
- Shure SE215: -15.13, -22.63, -36.73 dB
- TaoTronics TT-BH060: -15.05, -17.31, -37.19 dB
- Bowers & Wilkins PX7: -13.23, -22.7, -32.74 dB
- Beats Solo Pro: -11.23, -23.13, -36.36 dB
Overall score out of 10 for noise isolation. This score is possibly the
most helpful metric when choosing headphones with the best isolation.
- Sony WH-1000XM3: 9.8
- Bose QuietComfort 35 Series II: 9.2
- Bose QuietComfort 20: 9.1
- Bose 700: 9.0
- Bose QuietComfort 25: 8.7
- Apple AirPods Pro: 8.6
- Shure SE215: 8.5
- Mpow H10: 8.3
- TaoTronics TT-BH060: 8.2
- Sennheiser Momentum 3: 8.2
- Bowers & Wilkins PX7: 8.1
- Beats Solo Pro: 8.0