Whether you’re installing a whole house audio system or designing your dream home theater, you’ll need some form of amplification. An amplifier takes a small electrical signal, say from your iPhone or DVD player, and makes it bigger. However, amplifiers do more than just amplify a signal. A well-designed amp can also clean up power to reduce noise as well as improve overall sound quality. There are many different types and classifications of amplifiers to consider. One of the most common types is called a stereo amplifier which includes two channels to power a left and right speaker. For more complex audio systems, there are multi-channel amplifiers that can power four, eight and even 11 speakers at a time. There are also amplifiers designed solely to power subwoofers, as well as 70V amplifiers for large commercial audio systems. Let’s explore the different choices so you can choose the right amp for your project.