Why is KH-BT04 better than RS 275?
- Active noise cancellingYes · RS 275: No
- Battery life60 h vs 50 h+20%
- Charging time1.5 h vs 2 h+33%
Why is RS 275 better than KH-BT04?
- Lowest frequency20 Hz vs 6 Hz3.3×
- Weight245 g vs 195 g+26%
Specifications
Side by side
| Sound | ||
| Fit | Over-ear | On-ear |
| Ear cup design | Closed-back | Closed-back |
| Driver type | Dynamic | Dynamic |
| Driver size | 40 mm | — |
| Lowest frequency | 20 Hz | 6 Hz |
| Highest frequency | 20,000 Hz | 20,000 Hz |
| Impedance | 32 Ω | — |
| Sensitivity | — | 106 dB |
| Spatial / 3D audio | — | Yes |
| Hi-Res Audio | Yes | Yes |
| Noise control | ||
| Active noise cancelling | Yes | No |
| Noise reduction for calls | Yes | — |
| Battery & charging | ||
| Battery life | 60 h | 50 h |
| Battery life with ANC | 40 h | — |
| Battery capacity | 800 mAh | — |
| Charging time | 1.5 h | 2 h |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.4 | 5.4 |
| Bluetooth codecs | aptX HD | aptX Adaptive, AAC |
| Hi-res codec (LDAC / aptX HD / LHDC) | Yes | Yes |
| aptX | Yes | Yes |
| LDAC | No | No |
| LE Audio | — | Yes |
| Auracast | — | Yes |
| USB-C | — | Yes |
| Design & build | ||
| Weight | 245 g | 195 g |
| Foldable | Yes | Yes |
| Colours | Black | Black |
| Features | ||
| Hands-free calls | Yes | Yes |
