2dB Offset on Logarithmic (dB) Scale

Audacity 3.4.2

Steps to reproduce:

  1. Tracks → Add New → Mono Track
  2. Set scale to “Logarithmic (dB)”

Could someone please educate me about why there is a 2dB offset on the logarithmic (dB) scale?

0dB
-5dB
-10dB
-15dB
-20dB
-25dB
-30dB
-36dB
-32dB
-27dB
-22dB
-17dB
-12dB
-7db
0dB

Would expect something more like this.

0dB
-6dB
-12dB
-18dB
-24dB
-30dB
-36dB
-oodB
-36dB
-30dB
-24dB
-18dB
-12dB
-6db
0dB

This is what I get on W10 with 3.4.2

Peter

This is what I get on W11 and W8.1 with 3.4.2

It depends on the setting Interface > Meter db range.

1 Like

Ah, Okay. Thank you. Armed with this info. I was able to determine that this is because the meter dB range selections are 6dB multiples. But the track logarithmic (dB) scale is 5dB multiples.
So setting the meter dB range to any of the non 5dB multiple selections results in an offset in the track logarithmic (dB) scale.

If the track logarithmic (dB) scale was 6dB multiples, as alluded to in opening post, it would line up properly.

6dB multiples is more meaningful than 5dB too. When working with dB indicators, 3 & 6 dB increments/multiples are typically used. They have a natural significance (doubling/halving).

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