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But if 5 speaker setup have your front left and right speakers on the appropriate side of the television, your center speaker in the middle of the tv, Either mounted on the wall or underneath or on the shelf, try to have the center speaker set back from the front speakers. Subwoofer usually I mount behind the entertainment center. Your rear right and left speakers optimum position is behind you on the left and right.
If its a 7 speaker setup everything is the same except side right and left speakers go in the middle somewhere between the right and left front and rear speakers
I will make a example the the cursors  Speaker *TV LF CT and TV* RF Subwoofer behind tv SL SR LR RR
If you are referring to 5.1 surround you would have to have 5 speakers plus one powered subwoofer. The front left and right as well as your center channel to the majority of the sound reproduction with the rear channel being there for intricate sounds and background noise. The subwoofer will be a preamp output from your receiver. That signal will then get amplified by your subwoofers power amp. Generally subwoofers are tucked away in a corner while the other 5 speakers form a box around your viewing area.
Well to get the full effect of 5.1 surround you will need 2 front speakers, 1 subwoofer, and 2 rear speakers. Personally I used 2 tower speakers, 2 rear speakers and a subwoofer. Match the speakers with the RMS wattage of your Receiver. (100x5) or roughly 50 watts per speaker. Yamaha, KLH, Philips are pretty good speakers.
So your saying that you have no rear channel. Some recivers use a single stereo output ic for both sides on the rear speakers. you could have a defect with this IC . Anther thing Im sure you check3ed the obvious ie : the switch is on suround sound? If there is a front to rear fader is it in the middle? Good Luck