Loudness and Speaker Sensitivity - Discussion

mdikovics · 21st April 2010, 01:16 AM

This was written under the misunderstanding Sound Pressure Level (SPL) was of the form 10 Log (P2/P1) which is not the case. This is true for Power not Pressure!

SPL is of the form 20 Log (P2/P1). This causes all of the examples and conclusions to be in need of revision.

Note: Log is base 10...

There is also recent work that suggests that TWICE the volume (twice as loud) may be closer to 6dB SPL rather than 10 dB SPL. This is a psychoacoustic observation and is difficult to quantify. In any event 6-10 dB is a more appropriate measure. 6 dB SPL is 3 dB Power which suggests that twice as loud requires a little more than twice the power, but less than 3 times.

Mark

21st April 2010, 01:16 AM	#1
mdikovics diyAudio Member Join Date: Jan 2008	Contains numerous errors... This was written under the misunderstanding Sound Pressure Level (SPL) was of the form 10 Log (P2/P1) which is not the case. This is true for Power not Pressure! SPL is of the form 20 Log (P2/P1). This causes all of the examples and conclusions to be in need of revision. Note: Log is base 10... There is also recent work that suggests that TWICE the volume (twice as loud) may be closer to 6dB SPL rather than 10 dB SPL. This is a psychoacoustic observation and is difficult to quantify. In any event 6-10 dB is a more appropriate measure. 6 dB SPL is 3 dB Power which suggests that twice as loud requires a little more than twice the power, but less than 3 times. Mark

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