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All speakers should be working. The display on the Sony unit will tell you which speakers are enabled with a box illuminated and each speaker that is decoding with the speakers abrevation eg SL for surround left also illuminated. If these are not displaying then you need to check your playback mode. If play back is set to 2CH you will only get the front speakers. Try setting play back to AFD ProLogicII, Movie, or Music. If this does not get the speakers running then check the speaker configuration in the setup menu. It should be set to 5.1, if not set it and press enter to save it. If this is setup correctly then try the level settings in your menu. Each speaker has a setting that can be adjusted up or down to effect the loudness of the speakers. If this does not do it then check the connectons at each end of the suround speakers ie, at the receiver and at the speaker.
i would suggest alpines new 5 channel suround amplifier that has dolby 5.1 decoding and you will also have to have a head unit that supports 5.1 surround sound which as far as i could tell are only indash dvd players you will also need to purchase a center channel speaker as well
you can follow this link to the alpine amp http://www.crutchfield.com/p_500MRAF350/Alpine-MRA-F350.html?tp=115
Some sound fields have reverberant effects that need adjusting so the levels become audible, such as in "stadium" mode. While playing one of these sound fields, navigate through the speaker setup menu and make adjustments to the "effects" percentage, and levels. Be aware however, that only in 4 channel stereo mode will your surround speakers produce sound 100% of the time. Also, in any form of Dolby Pro Logic mode you will hear more sound from the surround speakers originating from stereo source material than from monoaural material...example, a television station broadcast in stereo versus mono.
SOUND FROM YOUR SURROUND SPEAKERS COMES BY BECAUSE OF PROCESSING THAT TAKES PLACE IN YOUR SURROUND CIRCUITS. IF THE SURROUND MODE IS ACTIVATED AND U GET NO EFFECT AND U SURE YOUR SURROND SPEAKERS ARE OPERATIONAL AND FULLY FUNCTIONAL. THEN THE PROBLEM LIES WITH YOUR SURROUND DECODING IN YOUR UNIT. REFER TO QUALIFIED SERVICING AGENTS.
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