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4 General Technical Information
Example: If the output power of an amplifier is increased by 18 dB, it’s been raised by a factor of 64 (!) =>
from 2 to 128 watts for example.
This also indicates that raising the loudness by 1 dB will require 27% more output power. Doubling the
loudness (3 dB) will result in 100% more output power.
While selecting an appropriate power amplifier, please note: Doubling the output power of an amplifier
increases the loudness (SPL) by 3 dB. Unfortunately, this does not mean, that the impression of loudness
is doubled as well. The human ear shows a varying sensitivity over frequency. Therefore, on average, we
require 10 dB increase of SPL (loudness) to feel a subjective doubling of the loudness. This, however, will
then require 10 times the output power of an amplifier - i.e. a 1000 W amplifier will seem (!) to be only
twice as loud as a 100 Watt amp.
c
2016 Bittner Audio Int. GmbH
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