Sony MDR-NC300D Product Information page 21

20 50 100 200
Frequency
Plane noise
When wearing headphones
(NC ON)
This area is equivalent to
the canceled noise energy
500 1k 2k
Total Noise Suppression Ratio (Typical values)
Plane Train/Bus
Mode A Mode B
1.0 dB (9. %) 1. dB (9. %)
 Based on Sony's noise source simulations
Office
Mode C
1. dB (9.9 %)
1