Sensitivity dB Calculations - diyAudio
 Sensitivity dB Calculations
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 4th July 2007, 03:48 PM #1 diyAudio Member   Join Date: Apr 2005 Location: NH Sensitivity dB Calculations Hello everyone, drawing a blank here..... I am looking at the WR125ST, which is 85.6 dB w/ 1 watt. Since it is a 16-ohm nominal speaker, that is 4 Volts input. How do I determine the dB with 2.83 Volts (0.5 Watts) input? I know there is an equation out there, just can't seem to find it.
 4th July 2007, 04:22 PM #2 diyAudio Member   Join Date: Apr 2005 Location: NH Just did a little experiment in Unibox. With 0.5 Watt, the output is at 82 dB, ~3 dB less. What is the equation the relates cutting the wattage in half, reduces dB by 3?
 4th July 2007, 05:55 PM #3 diyAudio Member RIP   Join Date: Nov 2003 Location: Brighton UK Hi, Sensitivity should be stated as dB/2.83V independent of impedance. The standard version is 85.6 dB (? 86dB) 8ohm, expect 83dB for 16ohm. sreten.
Speakerholic
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Join Date: Jan 2004
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Quote:
 Originally posted by 69stingray What is the equation the relates cutting the wattage in half, reduces dB by 3?
Hi Zach,

The equation is 10X the power = 10 more dB.

2X power and 3 dB is close enough for approximating.
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Let's help Ruth and Dave

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Join Date: Feb 2004
Location: Stockholm
Quote:
 Originally posted by 69stingray What is the equation the relates cutting the wattage in half, reduces dB by 3? [/B]
10 * log10 (P/Pref)

So if P/Pref=0.5, 10*log10(0.5)=10*0.301=3.01 dB.
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