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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
Quote:
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?

w

Quote:
Originally posted by infinia



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

10LOG (power in watts)/1watt

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

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

w

Hi,

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.

/sreten.
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Old 1st April 2009, 01:08 PM   #12
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Quote:
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.

w
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