vs
3.8Noise control & calls3.8
Why is HD 660S2 better than Real Blue Pro?
- Highest frequency41,500 Hz vs 21,000 Hz+98%
- Lowest frequency8 Hz vs 10 Hz+25%
Why is Real Blue Pro better than HD 660S2?
Real Blue Pro has no measurable advantages in this pair.
Specifications
Side by side
| Sound | ||
| Fit | Over-ear | On-ear |
| Driver size | 38 mm | — |
| Lowest frequency | 8 Hz | 10 Hz |
| Highest frequency | 41,500 Hz | 21,000 Hz |
| Impedance | 300 Ω | — |
| Sensitivity | 104 dB | — |
| Hi-Res Audio | — | Yes |
| Adjustable equaliser | — | Yes |
| Noise control | ||
| Active noise cancelling | No | No |
| Battery & charging | ||
| Battery life | — | 56 h |
| Fast charging support | — | Yes |
| Connectivity | ||
| Wireless | No | Yes |
| Bluetooth version | — | 5.1 |
| Bluetooth codecs | — | aptX, AAC |
| Hi-res codec (LDAC / aptX HD / LHDC) | — | No |
| aptX | — | Yes |
| LDAC | — | No |
| Multipoint (two devices) | — | Yes |
| USB-C | — | Yes |
| 3.5 mm jack / AUX | — | Yes |
| Smart & streaming | ||
| Voice assistant | — | Siri |
| Design & build | ||
| Weight | 260 g | — |
| Colours | Black | — |
