A/V Question: Dolby Digital/dts Decoder
Q. My question may sound stupid, because I'm just a beginner in audio/video. Do I need to buy a DVD player with a built-in Dolby Digital dts 5.1-channel decoder? And if so, must I also buy an A/V receiver with a built-in Dolby Digital/dts decoder? Or would this be redundant? — G. F.
A. There is no such thing as a stupid question when you're trying to 'decode' audio! No, you don't need a DVD player with a built-in Dolby Digital/dts decoder because virtually all modern A/V surround sound receivers already have internal Dolby Digital/dts decoders. The DVD player just needs to pass the Dolby Digital or dts data stream to the receiver via a coaxial or digital optical cable, and even the least expensive DVD players will do that. So it would be redundant to get a DVD player with built-in decoders (there is an exception: see below).
DVD players with built-in decoders are for use with older equipment that won't decode the digital 5.1-channel surround formats. For example, you might have a couple of old stereo amplifiers (or an old Dolby Pro Logic receiver) you wanted to use in an inexpensive Dolby Digital 5.1-channel home theater setup. As long as your old amps or receiver have line-level inputs for each amplifier channel, you could cobble together enough amps to feed the front left and right, center, and two surround channels. The DVD player with the built-in decoder will have six analog output jacks, one for each channel. Then you'd need to add a powered subwoofer for the ".1" low-frequency effects channel. You'd use the DVD players internal menu to do the proper setup for your speakers. It would be inconvenient adjusting overall volume levels, but it would work, and you'd save the cost of a new Dolby Digital/dts A/V receiver.
But if you want playback of DVD-Audio or SACD multichannel audio discs, the DVD player must have a built-in decoder for these formats because there are no receivers that will decode them (the record labels fear digital piracy so they won't provide digital outputs). Such DVD players almost always include Dolby Digital dts decoders as well.
About the Author
Alan Lofft was, for 13 years, Editor in Chief of Sound & Vision, Canada's largest and most respected audio/video magazine. He edited Sound & Vision (Canada) until 1996, when he moved from Toronto to New York to become Senior Editor at Audio magazine.
Lofft has been writing about hi-fi and video professionally for over 20 years, ever since his first syndicated newspaper column, "Sound Advice", began appearing weekly in The Toronto Star, Canada's largest-circulation daily newspaper. In the late 1970s, he became a contributing editor, columnist, and equipment reviewer at AudioScene Canada, the leading national consumer electronics magazine at the time.
He also wrote on consumer electronics for Maclean's magazine and made occasional appearances on TV on "Canada AM," the national CTV morning show, and on June Callwood's national afternoon TV talk show.
In 1983, he was appointed editor of Sound Canada magazine, which he relaunched in 1985 as Sound & Vision, incorporating video content and reviews as well as hi-fi and audio features. He also became a contributing editor to Stereo Review in New York, and an audio columnist for Music Express, a Canadian rock magazine.
An audio and electronics enthusiast from childhood, Alan began building vacuum-tube hi-fi gear for his father, who was an audiophile in the 1950s. Lofft's passion for audio continued through college, during which time he hosted and produced "On Campus", a radio show taped on location (on a portable Ampex 650 open-reel recorder) at Wilfrid Laurier University and broadcast locally in Kitchener, Ontario.