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Old 1st April 2009, 11:33 AM   #11
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Originally posted by wakibaki

200W is 3dB (twice = 3dB) over 100W which is 20dB
(100 = 2 zeros = 20dB) over 1W.
Making a total of 23dBW. 53dBm if you like.
The impedance is irrelevant.

What planet are you on sreten?


Originally posted by infinia

Simply wrong dBW is the ratio of power in watts to 1 Watt

10LOG (power in watts)/1watt

Originally posted by AndrewT
Sreten was referring to dBV and got it mixed up with dBW.

Originally posted by wakibaki
100W into 8 ohms and 200W into 4 ohms are both +20dBV?



Meanwhile back on planet earth I understand the use of dBW's
as in the same vein as dB/W/1m for a loudspeaker. An 8 ohm
load is assumed for dBW's and it is specified effectively as the
voltage into 4 ohms, you combine this with a 4ohm speakers
senstivity in dB/(2.83V)/1m and you get the correct SPL levels.

That is how it works and amplifiers are specified.

A correctly specified 4ohm dBW value tells you the dB sag from
the 8 ohm value that weill apply if driving 4 ohm speakers that
are usually specified as dB/W/1m but in reality are dB/2.83V/1m.

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Old 1st April 2009, 01:08 PM   #12
Join Date: Jan 2008
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Originally posted by AndrewT
Sreten was referring to dBV and got it mixed up with dBW.

Sorry AndrewT, no, it seems it was, in fact, dB/W he had it mixed up with, as in the statement "100W into 8 ohms and 200W into 4 ohms are both +20dB/W".

Now it makes perfect sense.

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