dB/W/M conversion - M vs 0.5 M ?? - diyAudio
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Old 26th December 2007, 02:08 AM   #1
MadMutt is offline MadMutt  Australia
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Default dB/W/M conversion - M vs 0.5 M ??

After many hours of hunting, I found some very basic specs on a set of drivers I'm intersted in.

BUT, they are quoting the sensitivity as 97 dB/W/0.5 M

So, is it possible to convert this to the more common dB/W/M ??

Even if someone can give me a vague idea of what they could come out as I'd be gratefull.

Doubt it matters but just in case;
The speakers are actually a set of car audio seperates.
Peerless P822000


Thanks......
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Old 26th December 2007, 06:12 AM   #2
Nanook is offline Nanook  Canada
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Default er I think this is the relationship....

intensity varies as 1/R, where R is the distance in meters (or feet) from the source.

So:

1/.5=1/.25=4
1/1=1

so at .5 metres the intensity will be 4 X's as much at 1 metre.

and a power factor of 10 is needed to double the apparent loudness

what does this mean to you? At 1W@1m, you will be effectively lowering the sensitivity to 91dB.

stew
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Old 26th December 2007, 06:33 AM   #3
MadMutt is offline MadMutt  Australia
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Maaany thanks.

Exactly the info I was after.

Wasn't expecting an answer for days.
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Old 26th December 2007, 12:51 PM   #4
Svante is offline Svante  Sweden
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Subtract 6 dB per distance doubling.
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