How much amplifier power do I need?

Amplifier Power Calculator

This audio amplifier power calculator will help you pick a power amplifier with enough watts for your application. Use the sliders to set the variables, and the calculations in watts will be shown below the orange line. Definitions are below the amplifier power calculator.

If you don’t understand how to set crest factor and average listening level, set crest factor to 0 and set the average listening level to the loudest you ever listen.

How to use the amplifier power calculator

If you really want to understand how this amplifier power calculator works and how to best use it to your advantage, you should read the article about how much amplifier power you need in terms of Watts.

Speaker sensitivity is how many dB SPL you get with 1W of power at 1 meter distance.

Amplifier headroom is how many dB of slack you want to give the amplifier so it doesn’t have to work so hard. More headroom means less distortion.

Listening distance from speakers is exactly what it says. It’s an important input because sound waves loose 6dB for every doubling of distance from the sound source.

Average listening level is not what level you listen to on average, but how loud it is on average when you are listening loudly.

Crest factor is the difference between the average level and the peak levels and is important because combined with the average listening level it determines how much work your amplifier has to do when there’s a lot of dynamic content in your program material.

Again, if you don’t understand how to set average listening level and crest factor, you can set crest factor to zero and set the average listening level to the loudest you ever listen. This will ensure that the amplifier have enough watts for situations when you listen to loud music.