This headline above is probably the most common myth in audio. When comparing two amplifiers, one with 100 watts of power and the other with 200 watts of power, it seems logical that the amp with 200 watts will play twice as loud as the 100 watt amp, providing the same speakers are used. In fact, the relationship between amplifier power and perceived loudness is very non-linear. A 200 watt amplifier will play only 3 decibels (3 dB) louder than an amplifier with 100 watts, hardly a reason to spend more money on the 200 watt amp. So, how much more power do you need to double the perceived loudness? Read more about amplifier power and how the human ear perceives loudness levels.