vs
4.8Battery9.6
Why is Free 2S better than STAX Spirit S3?
Free 2S has no measurable advantages in this pair.
Why is STAX Spirit S3 better than Free 2S?
- Battery life7 h vs 80 h11.4×
- Hi-res codec (LDAC / aptX HD / LHDC)No · Free 2S: Yes
- Battery capacity40 mAh vs 1,500 mAh37.5×
- aptXNo · Free 2S: Yes
Specifications
Side by side
| Sound | ||
| Fit | In-ear | — |
| Driver size | — | 89 mm |
| Lowest frequency | — | 20 Hz |
| Highest frequency | — | 40,000 Hz |
| Impedance | — | 24 Ω |
| Sensitivity | — | 94 dB |
| Spatial / 3D audio | Yes | — |
| Hi-Res Audio | — | Yes |
| Adjustable equaliser | — | Yes |
| Noise control | ||
| Active noise cancelling | — | No |
| Microphones | 4 | — |
| Noise reduction for calls | Yes | — |
| Battery & charging | ||
| Battery life | 7 h | 80 h |
| Total with charging case | 30 h | — |
| Battery capacity | 40 mAh | 1,500 mAh |
| Charging time | 1.5 h | 1.5 h |
| Quick charge (claimed) | — | 10 min → 11 h |
| Fast charging support | — | Yes |
| Wireless charging (case) | Yes | — |
| Connectivity | ||
| Wireless | Yes | Yes |
| Bluetooth version | 5.2 | 5.2 |
| Bluetooth codecs | SBC | aptX Adaptive, aptX, SBC |
| Hi-res codec (LDAC / aptX HD / LHDC) | No | Yes |
| aptX | No | Yes |
| LDAC | No | No |
| Multipoint (two devices) | — | Yes |
| USB-C | Yes | — |
| 3.5 mm jack / AUX | — | Yes |
| Latency | 60 ms | — |
| Low-latency game mode | Yes | — |
| Design & build | ||
| Protection rating | IPX7 | — |
| Water resistance (IPx) | IPx7 | — |
| Colours | — | Black |
| Features | ||
| Hands-free calls | — | Yes |
