vs
3.8Noise control & calls3.8
Why is 99 Classics 2nd Gen Walnut/Gold better than HD 660S2?
- Driver size40 mm vs 38 mm+5%
Why is HD 660S2 better than 99 Classics 2nd Gen Walnut/Gold?
- Lowest frequency15 Hz vs 8 Hz+88%
- Highest frequency25,000 Hz vs 41,500 Hz+66%
Specifications
Side by side
| Sound | ||
| Fit | Over-ear | Over-ear |
| Ear cup design | Closed-back | — |
| Driver type | Dynamic | — |
| Driver size | 40 mm | 38 mm |
| Lowest frequency | 15 Hz | 8 Hz |
| Highest frequency | 25,000 Hz | 41,500 Hz |
| Impedance | 16 Ω | 300 Ω |
| Sensitivity | 103 dB | 104 dB |
| Noise control | ||
| Active noise cancelling | No | No |
| Connectivity | ||
| Wireless | No | No |
| USB-C | Yes | — |
| 3.5 mm jack / AUX | Yes | — |
| Design & build | ||
| Weight | 260 g | 260 g |
| Colours | — | Black |
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