The effect that wattage will have on a speaker is defined as the speaker's sensitivity. Sensitivity is a measure of how efficiently a speaker converts electrical power into acoustic power. It is expressed in decibels (dB) and is measured at a distance of 1 meter from the speaker.

A speaker with a higher sensitivity will produce more sound output for the same amount of electrical power input. For example, a speaker with a sensitivity of 90 dB will produce the same sound output as a speaker with a sensitivity of 80 dB when given 10 times more electrical power.

Sensitivity is an important factor to consider when choosing a speaker because it will affect the volume of sound that the speaker can produce. If you are looking for a speaker that can play at high volumes, then you should choose a speaker with a high sensitivity rating.