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Most people do not get surround from their TV for TV shows, but with that said, as long as yur TV is Stereo and has Stereo analog outputs, you can get surround from your TV as a source. Most people get their TV surround from their Stereo H-FI VCR tuner.
You can get a Pre/Pro (Pre-amp, Sound Processor) that will not be able to tune in AM/FM stations, but would still be able to play CD's with an extrenal CD player. These need to be attached to an external amp with enough channels to drive all needed speakers.
With that said, the AVR (Audio Visual Reciever) is stil the way bets bang for your buck, and will include AM/FM reception as well as a host of inputs and outputs. These AVR's contain an impressive amount for sound processors, to give you surround sound from many different sources, they also include power amps for the respective needed speakers for surround.
To get surround on "Normal" TV, the program, network, and local station / cable provider must provide the channel / program in stereo. You must be able to recieve it in stereo and output it to the AVR via L/R (Left / Right) analog RCA audio cables.
HDTV is usually recieved on a separate tuner, then fed via digital connection to the AVR or pre/pro. If the tuner is in you TV, usually there is a digital output on your TV for this.
Movies, the sound needs to be output also through a digital connection most of the time from your DVD player / VCR / Laserdisc player. (On laserdisc, not all discs have digital sound, so once again you also need to hook up L/R analog audio cables.
I hope this helped some... A fair amount of ground to cover there.
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