Distortion Measurement Graph (THD%) dB?

[Venue]

Geeks,

I've come across a distortion graph (THD%) in which two high frequency drivers are compared.
I don't think knowing which drivers these are is essential, however, how do you translate this into dB?
Obviously, having it plotted in dB would yield more useful information, hence my interest in knowing that.
Is it possible to translate it without knowing at which loudness the measurement was taken, or its distance?

Love it, thanks a bunch!

 

[TLS Guy]

Geeks,

I've come across a distortion graph (THD%) in which two high frequency drivers are compared.
I don't think knowing which drivers these are is essential, however, how do you translate this into dB?
Obviously, having it plotted in dB would yield more useful information, hence my interest in knowing that.
Is it possible to translate it without knowing at which loudness the measurement was taken, or its distance?

Love it, thanks a bunch!

View attachment 58369

Distortion is NOT given in db. It is always given as a percentage of the signal under measurement. Always, no exceptions, not even for you. Since db. is a measurement of intensity, and is log, it would make no sense to convert it to db. To put it in perspective a sound the output, but not loudness of another would be 3db.

On that graph, I know one thing, I would not give one red cent for either of those tweeters, especially that red one, if 50% of the signal is distortion at 7 to 8 K.

Anything over 2% THD becomes detectible and increase fast from that point on.

 

[Venue]

Your explaining makes perfect sense, I agree with your response.
However, with the drivers above aside, take a look at this distortion graph (see below).
It's a completely different driver/speaker, everything is different, but notice how it's specified in dB?

Which of these graphs makes the most sense to you in terms of what can be interpreted?

 

[Steve81]

Equal (or 0dB difference) = 100 %
-10dB = 31.6%
-20dB = 10.0%
-30dB = 3.16%
-40dB = 1.0%
-50dB = <0.5%

FYI

 

[Venue]

Equal (or 0dB difference) = 100 %
-10dB = 31.6%
-20dB = 10.0%
-30dB = 3.16%
-40dB = 1.0%
-50dB = <0.5%

FYI

Yikes!! That's some distortion!

 

[Venue]

Total Harmonic Distortion (THD) Calculator • Electrical, RF and Electronics Calculators • Online Unit Converters

This Total Harmonic Distortion (THD) calculator determines the distortion factor THD as a percentage from known distortion attenuation in decibels and vice ...

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