Mains Hum

The power grid’s constant drone in recordings and amps — and a forensic timestamp hidden in audio.

Core Principles & Analysis

• Europe hums near a flat G at 50 Hz; the Americas near a flat B at 60 Hz.
• Ground loops and single-coil guitar pickups are classic routes for hum into recordings.
• Grid frequency wobbles uniquely over time, so forensic labs date recordings by their captured hum.

Specifications & Metrics

• FREQUENCY: 50 / 60 Hz + harmonics