What exactly is a decibel, and why is it measured on a logarithmic scale? In this episode of The SOUND Project, Gavin breaks down the science of sound intensity, exploring how decibels work, why our ears perceive loudness the way they do, and how this knowledge applies in both studio and live sound environments.

We’ll cover:

-The origins of the decibel and Alexander Graham Bell’s connection

-Why decibels are measured logarithmically

-Real-world examples of decibel levels (from quiet homes to rock concerts and jet engines)

-The importance of hearing protection and how filters work

-How decibel changes are perceived versus measured

-How multiple sound sources combine in terms of dB levels

Whether you’re a mixing engineer, a live sound tech, or just curious about how loudness works, this episode gives you a solid foundation in understanding decibels.

👉 Comment below: What’s the loudest sound you’ve ever been exposed to?

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Timestamps:

0:00 – Intro

0:08 – What is a decibel?

0:18 – Named after Alexander Graham Bell

0:42 – The formula for sound pressure level

1:15 – Why decibels are logarithmic

2:01 – Chart of decibel levels explained

2:18 – Threshold of hearing and anechoic chambers

2:51 – Everyday examples (home, conversation, cars)

3:38 – Car horns, concerts, and loud sound sources

4:56 – Pain threshold: jet engines and hearing damage

5:02 – How much difference a 1dB, 3dB, 6dB, or 10dB change makes

6:04 – Decibel reduction vs. perception

6:39 – Acoustical treatment and noise reduction goals

7:03 – Adding multiple sound sources (dB math explained)

8:11 – Summary: why understanding dB matters in sound

9:13 – Outro + question for viewers