Two channels or multiple channels?
People interested in putting together their own audio system will need a stereo or audio-stereo amplifier (AV). In both cases, technological advances have allowed manufacturers to miniaturize the internal components, making them lighter and more compact. But there is a difference between these two systems: The stereo amplifier is equipped with two loudspeaker channels, while the AV amp has a multi-channel decoder that separates the audio signal from a CD player or TV into five, six or seven distinct channels and redirects it toward the speakers. Here, the advantage is that you can plug in as many as seven speakers, including a subwoofer for extremely low audio frequencies. As you may have guessed, the AV amp is designed for home theatre, while the stereo amplifier is geared first and foremost to music lovers.
Of course, the stereo amplifier can be connected to a CD player, and some models come with an integrated CD player. This type of amp is relatively basic and doesn't feature any new innovations, other than higher-quality components than in the past. Still, some models with an RDS function can be connected to DVD players and do have a subwoofer output. As for the AV amplifier, it can handle all of the latest functions, such as MP3 and iPod compatibility and XM receiver. The most recent models include outputs for HDMI digital audio/video cable. Usually, the digital audio and video signals are captured separately, while HDMI technology places the receptors for these signals in the same cable. This digital technology offers the best performance and the highest quality sound and image, though other digital outputs, for the most part, provide decent quality. Note that high-end AV amplifiers are sometimes equipped with a small microphone that automatically balances the sound from each speaker.
Also available on the market are all-in-one home theatre systems, often called “THB.” Like a compact hi-fi system, this one includes everything you need for a great home-theatre experience: an AV amplifier and speakers, with integrated DVD player (optional). Even if it is of lesser quality than a stereo amplifier and traditional speakers, this system is often more than sufficient. In addition, the high-end models come with all of the latest functions, including MP3 compatibility.
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