dB Gain -- was RE: [K3] [Elecraft] FLx GN Adding Db gain

[Jim Brown]

On Thu, 13 Nov 2008 23:42:37 +0000, David Woolley (E.L) wrote:

>Audio dB are weighted by frequency, so the same power at different 
>frequencies will not produce a 0dB difference.

The use of weighting requires another suffix. 

>It's more complex than that.  Classical music broadcasters need to
>respect dynamic range

Of course -- I oversimplified (only slightly) as an exageration of 
conditions in the US. Here we have VERY few classical broadcasters. 
AND -- while dynamic range must be respected, it cannot be 
maintained as a copy of an actual performance because the noise 
level of the listening environment is simply too high. A symphonic 
performance on CD can have a dynamic range of 90 dB, but the noise 
level in most homes is on the order of 50 dBA. 90 dB + 50 dBA = 140 
dBA, which is 20 dB more than almost any home stereo rig. And your 
car is more like 70 dBA. 

73,

Jim K9YC