Amplifiers explained: Do you need one for better sound?

An amplifier boosts audio signals to make them audible and allows users to adjust gain and equalization, shaping sound quality and preventing distortion. Its importance depends on the system, as many active speakers and receivers already include built-in amps. Separate amplifiers are only necessary for passive speakers or power-hungry setups, such as elaborate Dolby Atmos configurations exceeding a receiver's channel capacity. Solid-state amps are generally recommended over tube models, which offer warmer sound but lower power and higher maintenance. Most consumers can improve sound more cost-effectively by upgrading speakers, adding channels, or adjusting placement and room acoustics. Dedicated amps are often redundant unless building a high-end home theater or audiophile-grade system.