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Old 14th March 2004, 09:10 PM   #1
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Default SPL and Watts

A while ago, I saw a table comparing SPL to Watts. I wonder if anyone could point me to one such as this. It showed the power (in watts) required to reach each SPL level.
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Old 14th March 2004, 09:22 PM   #2
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A few seconds with Google finds this:

http://home.new.rr.com/trumpetb/audio/dBexamp.html
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Old 14th March 2004, 09:23 PM   #3
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Assuming you mean "SPL (dB, 1W/1m)", then there's no need: take the SPL figure and add or subtract as many decibels as compared to the 1W test figure. So if you put 10W through an 88dB/1W/1m rated speaker, you'll read 88 + 10*log(10W/1W) = 98dB. (In acoustical energy terms, this is 98 = 10*log(I/10^-12) ~= 6mW per square meter, in case you were wondering.)

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Old 14th March 2004, 09:26 PM   #4
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1Watt into a speaker with 100% efficiency makes about 112dB SPL

a tabel efficiency - dB at 1W here

http://www.lsv-achenbach.de/basics/db_spl_no.htm

double the Watt get 3dB+

something here about dB

http://www.columbia.edu/~fuat/cuarc/dB.html
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Old 14th March 2004, 09:36 PM   #5
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Quote:
Originally posted by till
double the Watt get 3dB+
I was thinking along the lines of a table with the watts starting at 1 and doubling, and the appropriate dB.

PS: Thanks for the replies.
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Old 14th March 2004, 09:40 PM   #6
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Quote:
I was thinking along the lines of a table with the watts starting at 1 and doubling, and the appropriate dB.
you need to give a speakers efficiency for this. In case its 100% you make

1W 112dB
2W 115dB
4W 118dB
usw

in case you have a real world speaker with < 100% efficiency you start with the value from the table behind the link.

for example my speakers with about 100dB/1W

1W 100dB
16W 112dB (with ZEN)
32W 115dB (with OPA549 AMP)
128W 121dB (150W ratet input speaker)
256W 124 dB (300W max input power speaker)
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Old 14th March 2004, 10:00 PM   #7
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Matt:

How is this chart? It is from Richard Small. It has acoustic watts on the left, and the equivalent SPL on the right. It also tells you how much air must be moved in a sealed system to produce what SPL, (or acoustic watts) at which frequency.

There are two charts, one in normal and one in Metric measurements.

Volume Displacement For SPL Chart
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