An undamped bass-heavy soundsystem in a small room can hit the room's resonant frequency, causing mechanical feedback through objects on the DJ table

Pinch describes playing ‘Bahl Fwd’ by Skream in a Berlin bank vault venue: ‘the mixer would be bouncing on the table like a glass. When I dropped Bahl Fwd, a pile of flyers went up into the air like confetti and I had to catch the mixer and hold it down. I thought we’d hit the resonant frequency of the room.’ Every room has resonant frequencies determined by its dimensions; when a bass note matches those frequencies the room reinforces the sound exponentially. In small rooms with hard walls (like a vault) this effect is extreme. Pinch identified the mechanism: an MC standing in front of the speaker caused bass feedback through the mic, combined with the room resonance, creating bass pressure that felt physically crushing. The track was mastered with no EQ on the bass — ‘full power, untouched bass’ — amplifying the effect.

Examples

At the same event, when bass feedback through the MC’s mic combined with room resonance, Pinch ‘thought I was going to die in that room.‘

Assessment

Explain what a room’s resonant frequency is and describe what happens when a bass note matches it in a small, hard-walled room with an undamped soundsystem.