“What is Noise Reduction Rating [NRR] measured in decibels for this Sony - Noise-Canceling Over-the-Ear Headphones ( Model: MDRZX110NC/B ) ? What is Noise Reduction Rating [NRR] measured in decibels for this Sony - Noise-Canceling Over-the-Ear Headphones ( Model: MDRZX110NC/B ) ? For example, Noise Reduction Rating [NRR] measured in decibels for Stanley® Premium Foldable Earmuff ( Model: RST-63007 ) is 27 db”