We've all seen the Sound Pressure Level decibel reference tables where you have "quiet room", "chainsaw", "jet engine" and so on.

While that is handy for estimating increased loudness in decibles, it didn't help me when thinking about the measurement levels obtained around here when measuring electrical deficiencies (DAC output, distortion, frequency spikes, etc) in reference to the device's Full Scale output.

Here's my handy ballpark reference going the other direction, when trying to "imagine" sound that is "softer" than another by some number of decibels.

Assuming:

Sound propagation (ignoring loss in air, and any other complications) and using the general formula where a doubling of distance is equal to a 6dB drop in the sound level...

Someone is shouting at you from a meter away (representing 0dB, the "full scale reading", a loud sound, surely somewhat equivalent to a not unreasonably loud stereo system playing in your room)...

Then...

This handy table estimates the distance of a second Shouter at various distances and diminishing sound levels, relative to the full scale Shouter shouting from 1 meter away.

If you think it is bogus (a little inaccurate doesn't count as a fault here), please explain why.

Shoutometer™

Shoutometer DeLuxe

Measures in terms of signal power...

Full Scale = one unit

-10db = 0.1

-20dB = 0.01

-30dB = 0.001 milli Units

-40dB = 0.0001

-50dB = 0.00001

-60dB = 0.000001 micro units

-70db = 0.0000001

-80dB = 0.00000001

-90dB = 0.000000001 nano units

-100dB = 0.0000000001

-110dB = 0.00000000001

-120dB = 0.000000000001 pico units

-130dB = 0.0000000000001

-140dB = 0.00000000000001

-150dB = 0.000000000000001 femto units

-160dB = 0.0000000000000001

-170dB = 0.00000000000000001

-180dB = 0.000000000000000001 atto units

While that is handy for estimating increased loudness in decibles, it didn't help me when thinking about the measurement levels obtained around here when measuring electrical deficiencies (DAC output, distortion, frequency spikes, etc) in reference to the device's Full Scale output.

Here's my handy ballpark reference going the other direction, when trying to "imagine" sound that is "softer" than another by some number of decibels.

Assuming:

Sound propagation (ignoring loss in air, and any other complications) and using the general formula where a doubling of distance is equal to a 6dB drop in the sound level...

Someone is shouting at you from a meter away (representing 0dB, the "full scale reading", a loud sound, surely somewhat equivalent to a not unreasonably loud stereo system playing in your room)...

Then...

This handy table estimates the distance of a second Shouter at various distances and diminishing sound levels, relative to the full scale Shouter shouting from 1 meter away.

If you think it is bogus (a little inaccurate doesn't count as a fault here), please explain why.

Shoutometer™

Shoutometer DeLuxe

Measures in terms of signal power...

Full Scale = one unit

-10db = 0.1

-20dB = 0.01

-30dB = 0.001 milli Units

-40dB = 0.0001

-50dB = 0.00001

-60dB = 0.000001 micro units

-70db = 0.0000001

-80dB = 0.00000001

-90dB = 0.000000001 nano units

-100dB = 0.0000000001

-110dB = 0.00000000001

-120dB = 0.000000000001 pico units

-130dB = 0.0000000000001

-140dB = 0.00000000000001

-150dB = 0.000000000000001 femto units

-160dB = 0.0000000000000001

-170dB = 0.00000000000000001

-180dB = 0.000000000000000001 atto units

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