Why is ATH-CK1TW better than Free 2S?
ATH-CK1TW has no measurable advantages in this pair.
Why is Free 2S better than ATH-CK1TW?
- Water resistance (IPx)IPx5 vs IPx7+40%
- Charging time3 h vs 1.5 h2×
Specifications
Side by side
| Sound | ||
| Fit | In-ear | In-ear |
| Driver type | Dynamic | — |
| Driver size | 4.9 mm | — |
| Lowest frequency | 20 Hz | — |
| Highest frequency | 25,000 Hz | — |
| Impedance | 16 Ω | — |
| Sensitivity | 98 dB | — |
| Spatial / 3D audio | — | Yes |
| Noise control | ||
| Microphones | — | 4 |
| Noise reduction for calls | — | Yes |
| Battery & charging | ||
| Battery life | 7 h | 7 h |
| Total with charging case | — | 30 h |
| Battery capacity | — | 40 mAh |
| Charging time | 3 h | 1.5 h |
| Wireless charging (case) | — | Yes |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.1 | 5.2 |
| Bluetooth codecs | SBC | SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | No | No |
| aptX | No | No |
| LDAC | No | No |
| USB-C | Yes | Yes |
| Latency | — | 60 ms |
| Low-latency game mode | — | Yes |
| Design & build | ||
| Earbud weight (each) | 6 g | — |
| Protection rating | IPX5 | IPX7 |
| Water resistance (IPx) | IPx5 | IPx7 |
| Features | ||
| Hands-free calls | Yes | — |
