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The Amplifier: Boosts your Preamp/Processor Signal to Match the Power of Loudspeakers. An amplifier takes the signal coming from each channel of a preamp or processor and boosts it so it can power loudspeakers. For most systems, you will need one amplifier channel for each speaker connected.

The Processor: The Command Center of your Surround Sound System

The Receiver: Your Audio System's Core. Serving as the central hub, it processes and amplifies audio signals for distortion-free, clear sound from any source—movies, music, or TV shows, defining your home's sound experience.

The Preamplifer (or Preamp): The Command Center of your Stereo System which has a major influence on how your system sounds. Preamps select which audio source to listen to and provide you with useful features like tone controls. Most stereo preamps have fewer features than surround-sound processors, placing more emphasis on sound quality and analog audio performance.

The Loudspeaker: The Voice of Your Stereo or Home Theater System. The loudspeaker converts the electrical signal from your amplifier into sound you can hear, ideally without adding any distortion or coloration along the way, and is the single most important factor in determining how your system will sound.