Sensitivity dB Calculations

69stingray · 4th July 2007, 03:48 PM

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.

69stingray · 4th July 2007, 04:22 PM

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?

sreten · 4th July 2007, 05:55 PM

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.

Cal Weldon · 4th July 2007, 08:45 PM

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.

Svante · 5th July 2007, 12:25 AM

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.

4th July 2007, 03:48 PM	#1
69stingray 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. __________________ Audio DIY Page FOLLOWMY529.COM - Subscribe and follow the performance of my daughter's 529 College Saving Account.

4th July 2007, 04:22 PM	#2
69stingray 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? __________________ Audio DIY Page FOLLOWMY529.COM - Subscribe and follow the performance of my daughter's 529 College Saving Account.

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4th July 2007, 05:55 PM	#3
sreten diyAudio Member 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.

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