vs
9.0Battery4.8
Why is ATH-CKS50TW better than Free 2S?
- Battery life20 h vs 7 h2.9×
- Hi-res codec (LDAC / aptX HD / LHDC)Yes · Free 2S: No
- Total with charging case50 h vs 30 h+67%
- aptXYes · Free 2S: No
Why is Free 2S better than ATH-CKS50TW?
- Water resistance (IPx)IPx4 vs IPx7+75%
- Charging time3 h vs 1.5 h2×
Specifications
Side by side
| Sound | ||
| Fit | In-ear | In-ear |
| Ear cup design | Closed-back | — |
| Driver type | Dynamic | — |
| Driver size | 9 mm | — |
| Lowest frequency | 5 Hz | — |
| Highest frequency | 20,000 Hz | — |
| Impedance | 20 Ω | — |
| Sensitivity | 110 dB | — |
| Spatial / 3D audio | — | Yes |
| Hi-Res Audio | Yes | — |
| Adjustable equaliser | Yes | — |
| Noise control | ||
| Active noise cancelling | No | — |
| Transparency / ambient mode | Yes | — |
| Microphones | — | 4 |
| Noise reduction for calls | — | Yes |
| Battery & charging | ||
| Battery life | 20 h | 7 h |
| Total with charging case | 50 h | 30 h |
| Battery capacity | — | 40 mAh |
| Charging time | 3 h | 1.5 h |
| Fast charging support | Yes | — |
| Wireless charging (case) | — | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.2 | 5.2 |
| Bluetooth codecs | aptX Adaptive, aptX, AAC, SBC | SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | Yes | No |
| aptX | Yes | No |
| LDAC | No | No |
| Multipoint (two devices) | Yes | — |
| USB-C | Yes | Yes |
| Latency | — | 60 ms |
| Low-latency game mode | — | Yes |
| Design & build | ||
| Earbud weight (each) | 8 g | — |
| Protection rating | IPX4 | IPX7 |
| Water resistance (IPx) | IPx4 | IPx7 |
| Features | ||
| Hands-free calls | Yes | — |
