Noise-cancelling headphones can abruptly eliminate a city’s pervasive low-frequency hum

Evidence

When I switch them on, something impressive happens. The roar of New York, the monster-breath, stops dead. — George Michelsen Foy, Zero Decibels, 126

Categorization

• corroborated: 2 independent passages support this claim — George Michelsen Foy, Zero Decibels: The Quest for Absolute…, 126
• XREF: connects to: City dwellers become functionally deaf to a constant low background urban hum — George Michelsen Foy, Zero Decibels: The Quest for Absolute…, 94; Urbanization shortened the distance humans can hear and see — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 150; Headphone listening reveals sounds ordinarily outside awareness — Pauline Oliveros, Deep Listening, 279 (+1 more)

Broader Connections

• Headphone listening reveals sounds ordinarily outside awareness #corroborates (0.75) — Pauline Oliveros, Deep Listening, 279