[quote name='Skybone' timestamp='1447160956' post='2905355']
The decibel scale is based on a Logarithmic scale, not a linear scale.
An increase of 3dB represents a noticeable doubling in the volume, so a 1dB gain may well be audible for most people, but most wouldn't really realise it (unless they have sensitive hearing).
For example, a 50w guitar amp is rated at 100dB, where a 100w guitar amp is rated at 103dB. Although the Wattage rating is doubled, the dB rating is only 3dB, but the 100w amp will be twice as loud.
[/quote]
The 100W amp will not be twice as loud, for that you'd be looking for 400W and hope your speakers don't melt before you reach that volume increase!