Why is Q31i better than HD 400U?
- Active noise cancellingYes · HD 400U: No
Why is HD 400U better than Q31i?
HD 400U has no measurable advantages in this pair.
Specifications
Side by side
| Sound | ||
| Fit | Over-ear | Over-ear |
| Ear cup design | Closed-back | Closed-back |
| Driver type | Dynamic | Dynamic |
| Driver size | 40 mm | — |
| Lowest frequency | — | 18 Hz |
| Highest frequency | — | 20,000 Hz |
| Impedance | — | 18 Ω |
| Sensitivity | 98 dB | 120 dB |
| Spatial / 3D audio | Yes | — |
| Hi-Res Audio | Yes | — |
| Adjustable equaliser | Yes | — |
| Noise control | ||
| Active noise cancelling | Yes | No |
| Adaptive ANC | Yes | — |
| Microphones | 4 | — |
| Noise reduction for calls | Yes | — |
| Battery & charging | ||
| Battery life | 80 h | — |
| Battery life with ANC | 50 h | — |
| Quick charge (claimed) | 10 min → 10 h | — |
| Fast charging support | Yes | — |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 6 | — |
| Bluetooth codecs | LDAC | — |
| Hi-res codec (LDAC / aptX HD / LHDC) | Yes | — |
| aptX | No | — |
| LDAC | Yes | — |
| USB-C | Yes | Yes |
| 3.5 mm jack / AUX | Yes | Yes |
| Smart & streaming | ||
| Companion app | Yes | — |
| Design & build | ||
| Colours | Black | — |
| Features | ||
| Hands-free calls | Yes | — |
