dolby

Introduction to A/V Receivers

Surround Sound

At the heart of the receiver is the surround-sound processor. The most basic surround processors use a Dolby Pro Logic II decoder. Pro Logic II is a "matrix" system that takes an encoded two-channel stereo signal and converts it to a five-channel full bandwidth (range) playback (Left/Center/Right/Left Surround/Right Surround),resulting in a surround experience. Most TV shows are encoded in Dolby Pro Logic II, as are the majority of VHS videos. You can also play DVDs through a Pro Logic II only-receiver because DVD players can synthesize a Pro Logic II signal that mimics a surround soundtrack. The newer Dolby Pro Logic IIx adds the ability of converting stereo or 5.1-channel surround sound for seamless 6.1 or 7.1 playback.

HDTV's Secret Weapon: Sound

The "5.1" reference that appears at the start of many primetime shows is the networks' advisory to switch on your home theater's speaker system. When you do, you'll enjoy the program the way it was meant to be heard. A show broadcast in Dolby Digital 5.1 can deliver audio to five full-range speakers (front left, center, front right, surround left, and surround right) plus a low frequency effects channel (designated by the ".1") to the subwoofer.

To increase your awareness of what you're missing if you happen to be watching a TV that doesn't include an external sound system, we've listed some of the ways a program's sound director enhances the show by steering audio to discrete speakers in your home theater.

Yamaha HTR-6140BL 5.1-Channel Digital Home Theater Receiver

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