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I think this is just 5 amplified speakers. To get the real 2.1, 4.1, 5.1 or 6.1 sound experience, you will need to add a 4-channel sound card with a Dolby decoder to drive the speakers as descrete channels. The real trick is in the card - and I don't think Dolby will share their technology.
Here I found a simple schematic for surround sound decoding. **broken link removed**
This is not real dolby decoder but simple filters which separate out low, high and mid frequencies from audio signal and separately feed individuals amplifiers. The dolby chip does the same thing but more precisely and with less distortion. All you need to construct is 5 separate power amplifiers and connect the output of this circuit to them. Remember that power of sub-woofer should be greater than that of the satellites.
not all trick just in the card
nut i think the good sound system is depended on the card and the subwoofer quality .
thank you very much Mr kinjalgp
but iam beginner in electronic circuits
and i want to understand something
are this schematic fit to be a good subwoofer
i can plug it on my computer
and hear a good sound i cant hear it from the normal speakers ?
Yes you can plug it into your computer sound card provided you have 4-outputs on it. If you construct it carefully , the sound quality will be good. You can compare it with dolby decoder since the job of both of them is same but you can't say that it is exactly same as a dolby decoder since there are many other things that chip performs. The above circuit performs only the basic filtering task.
But overall it will be a good hearing experience since separating audio frequencies and applying them to those speakers which are just made to reproduce them will create better effect than single speakers.
Mind that you have to construt 5 other power amps. to connect at the output of decoder circuit which will drive the speakers and sub-woofer.
For Satellites : **broken link removed** (you'll need two of them)
For Sub-woofer : **broken link removed**
There are many options that you can choose from. The power of sub-woofer should be around 3 times more than satellites. If you require lower power than this, then use the satellite amp. as sub-woofer amp. and get 6W amp. for satellites.