Why is K2 better than RB-HF630B?
- Charging time2.5 h vs 4 h+60%
- Driver size40 mm vs 30 mm+33%
Why is RB-HF630B better than K2?
- Battery life40 h vs 72 h+80%
Specifications
Side by side
| Sound | ||
| Fit | — | On-ear |
| Ear cup design | Closed-back | Closed-back |
| Driver type | Dynamic | Dynamic |
| Driver size | 40 mm | 30 mm |
| Lowest frequency | — | 20 Hz |
| Highest frequency | — | 20,000 Hz |
| Noise control | ||
| Active noise cancelling | No | No |
| Battery & charging | ||
| Battery life | 40 h | 72 h |
| Charging time | 2.5 h | 4 h |
| Fast charging support | — | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.4 | 5.3 |
| Bluetooth codecs | — | AAC, SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | — | No |
| aptX | — | No |
| LDAC | — | No |
| Multipoint (two devices) | — | Yes |
| USB-C | — | Yes |
| 3.5 mm jack / AUX | Yes | — |
| Design & build | ||
| Weight | — | 140 g |
| Foldable | — | Yes |
| Features | ||
| Hands-free calls | — | Yes |
