3 channels do not work, speakers 5.1 Microlab x4

3 channels do not work, speakers 5.1 Microlab x4
Hello, I bought used speakers, all the speakers are working, but there are no channels. of 5 channels do not work 3. What could be the reason, and what is responsible for the payment for these channels? There was an idea to change the shield (I do not know exactly what is called), I hope it helps. Who knows, tell me. Not working channels highlighted in a blue circle.

You will not get multi-channel sound from 2.0 stereo 5.1
You can not duplicate the photo in the comment - everything you want to do has nothing to do with surround / 5.1 surround sound. The maximum that you get according to the found "tricky" scheme is stereo "scattered" in all the columns. Porridge will work. However, it can arrange it ...
In order for everything to be “competent”, all 6 connections on the 5.1 CH INPUT panel must be connected with cables according to the color coding to the same output from the computer in which the sound card with the surround sound processor should be installed. It can be a separate prefix.
But that will be half the battle. A multi-channel track source is required. Designated 5.1 Dolby Digital (born Dolby Digital, AC-3, ATSC A / 52).
But it’s precisely such tracks that video pirates “cut out” to reduce the file size ...
The most reliable thing is to buy licensed DVDs or BDs that indicate DD Surround ...
In extreme cases, you can use simulation 5.1 - Dolby Pro Logic format.
Of course, all of the above will need to be done only if you need to connect a home theater system.

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