Sone - 187 [best] -

In the lexicon of psychoacoustics, the sone is a deceptively simple creature. Unlike the decibel—a relative measure of pressure—the sone is linear. One sone is defined as the loudness of a quiet, 1 kHz tone at 40 dB SPL. Two sones sound twice as loud. Forty sones sound forty times as loud.

In the end, is not a measurement. It is a warning: You are no longer listening. You are being unmade by vibration. sone - 187

187 sones converts to approximately 120 decibels —the threshold of human pain. But the sone value tells a more terrifying story: it is nearly five times louder than that shouting match. It is the roar of a jet engine from 50 meters, the blast of a rock concert’s subwoofer stack, the sound of a .357 Magnum fired in a concrete stairwell. In the lexicon of psychoacoustics, the sone is

But what happens at ?

At , the linear scale ceases to be academic and becomes visceral. Two sones sound twice as loud

To answer, we must abandon the laboratory. At 40 sones (roughly 70 dB), you are standing next to a running vacuum cleaner. At 80 sones (85 dB), it’s heavy city traffic inside your skull. At 100 sones (90 dB), a shouted conversation becomes a battle.