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Living Room / Decibels, loudness, amplifiers, formulas...complete confusion!
« Last post by superboyac on December 09, 2014, 04:05 PM »OK, I just admitted something really embarrassing in another forum, thought I'd share it here.
As a music nut, musician, engineer (electrical at that), all around nerdo geek...I don't understand decibels as it relates to loudness. More so than that, I don't get it in relation to amplifier circuitry and the formulas used.
This all started when I began researching types of headphone amps to get for my home studio. This is really embarrassing to admit...I've written books on electrical engineering.
All the circuitry (obviously) uses volts, amps, currents. Fine, I am comfy with that. But then, somehow these numbers are magically turned into decibels! How the f? Now, decibels is not a unit I enjoy using. First of all, for loudness, the unit it uses is called SPL, which is a measure of sound pressure. But decibel in itself is dimensionless; it's a ratio of one unit over another number of the same unit (i.e. they cancel out). So a inputted values for decibels can be volts, ohms, watts, spl, mattresses, bicycles, whatevers.
On top of all that, I have to sort through all the audiophile pseudo-science, snake oil nonsense.
Am I crazy?
Here's a fun chart:

from here:
http://www.sengpiela...culator-loudness.htm
I don't know what is going on there, but it looks helpful if I did!
As a music nut, musician, engineer (electrical at that), all around nerdo geek...I don't understand decibels as it relates to loudness. More so than that, I don't get it in relation to amplifier circuitry and the formulas used.
This all started when I began researching types of headphone amps to get for my home studio. This is really embarrassing to admit...I've written books on electrical engineering.
All the circuitry (obviously) uses volts, amps, currents. Fine, I am comfy with that. But then, somehow these numbers are magically turned into decibels! How the f? Now, decibels is not a unit I enjoy using. First of all, for loudness, the unit it uses is called SPL, which is a measure of sound pressure. But decibel in itself is dimensionless; it's a ratio of one unit over another number of the same unit (i.e. they cancel out). So a inputted values for decibels can be volts, ohms, watts, spl, mattresses, bicycles, whatevers.
On top of all that, I have to sort through all the audiophile pseudo-science, snake oil nonsense.
Am I crazy?
Here's a fun chart:
from here:
http://www.sengpiela...culator-loudness.htm
I don't know what is going on there, but it looks helpful if I did!

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