Decibel (dB)
The decibel is the logarithmic unit of audio level: +6 dB is roughly double the signal amplitude, and every 10 dB is perceived as about twice as loud.
Decibels are always relative to a reference — dBFS references digital full scale, dB SPL references acoustic pressure. The logarithmic scale matches hearing, which spans a trillion-to-one power range.
Related terms
Frequently asked
What is Decibel?
The decibel is the logarithmic unit of audio level: +6 dB is roughly double the signal amplitude, and every 10 dB is perceived as about twice as loud.
Why does Decibel matter?
Decibels are always relative to a reference — dBFS references digital full scale, dB SPL references acoustic pressure. The logarithmic scale matches hearing, which spans a trillion-to-one power range.
What terms are related to Decibel?
Closely related concepts: dBFS (decibels relative to full scale), Amplitude, Dynamic range — each has its own entry in this glossary.