In this article, the working and basics of multi-channel surround sound system is explained along with images. The different types of sound systems available and other common sound formats are also explained in detail.

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Multi-channel Audio

Multi-channel audio systems are widely used in modern sound devices. The term “multi-channel audio” means that, the audio system can be capable of handling multiple audio channels (usually called audio tracks) to rebuild the sound on a multi-speaker setup.

Usually two digits separated by a decimal (.) point (2.1, 4.1, 5.1, 6.1, 7.1, etc.) are used to classify the various kinds of speaker set-up, this number basically depending on how many audio tracks are used. Some audio systems only have a single channel (called monophonic sound or single channel audio) or two channels (stereophonic sound or 2.0 channel sound)

The first digit shows the number of primary channels (called satellite units), each of which are reproduced on a single speaker (these speakers are capable for handling the frequency range from 100Hz to 22Khz), while the second (decimal digit) refers to the presence of LFE (Low Frequency Effect), which is reproduced on a subwoofer.

Stereo Setup
Stereo Setup

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Surround Sound System
Surround sound is a term used to describe a type of audio output in which the sound appears to “surround the listener” by 360 degrees –  that is, the technology gives the impression that sounds are coming from all possible directions.

Surround sound is a way to provide a more realistic and engaging experience. All technical aspects aside, surround sound works because multiple audio channels are received through speakers that are positioned at various locations in the room. This is programmed into the source and the sound tracks are decoded when the source is played.

The Surround Sound Setup

The main component of a surround sound setup is a multi channel or digital coaxial/optical audio decoder. Using a DVD/HVD movie, the audio is encoded when the DVD/HVD is produced by packing multiple audio channels into a compressed format for storage.  When you play the DVD movie, your DVD player or A/V receiver (commonly called a home theatre receiver) decodes the encoding scheme (i.e. Dolby Pro Logic II or DTS for example). Decoding capabilities of an A/V receiver are built in. Most A/V receivers today can decode Dolby Digital and Digital Theater Sound (DTS) (DTS channel usually a coaxial or optical audio channel. It is a single channel digital pin that multiplexed with several channel. The decoder decodes the DTS sound from single channel to multiple channels), while higher-end receivers may also include DTS-ES or THX Surround.

Multi-channel Surround Sound Systems

  • 5.1 Surround Sound Systems

5.1 Surround sound systems are one of the widely used surround sound setup in home theater systems. Usually- Dolby Digital and DTS encoded in a DVD are 5.1 channel audio formats.  5.1 surround sound technologies produces five channels of sound in the left, right, center, left-surround and right-surround positions. These five channels are the minimum required to produce 5.1 surround sounds. The dot decimal (.1) represents the channel for LFE (low frequency effects), which is usually sent to a subwoofer. Other 5 units are capable for handling the frequency range except low frequency(Usually they are capable of  handling  the frequency range from 100Hz to 22Khz and no need for any other higher frequency component like tweeter). These five units are usually called satellite units. The arrangements of a 5.1 surround sound setup shown in the picture below.

5.1 surround sound
5.1 surround sound
  • 6.1 Surround Sound Systems

6.1 multichannel sound technologies is the advanced version of 5.1 surround sound technology. 6.1 technology uses the same set-up as a 5.1 system, but it has the addition of a sixth speaker that takes the rear-center surround position (or back surround position) to provide a more 3-D realistic surround sound effect. 6.1 surround sound uses extended surround sound formats, such as THX Surround EX, Dolby digital ES and DTS-ES. The 6.1 channel surround sound setup is shown in the picture.

6.1 Surround Sound Systems
6.1 Surround Sound Systems

Image From

  • 7.1 Surround Sound Systems

7.1 channel audio systems is the modified version of 6.1 channel and also provide more realistic experience than 6.1 setup. In this system splits the single rear-center speaker into individual left- and right-rear surround. These systems are not a true discrete 7.1 channel system as 7.1 formats don’t currently exist. In a true discrete 6.1 surround system, the back center surround position is separate from the surround left (SL) and surround right (SR) positions. A 7.1 channel system uses   matrixes extended surround where the left-back and right-back (rear-center surround) multichannel are blended together and stored. The structure of a 7.1 setup is given in the Picture below.

7.1 Surround Sound Systems
7.1 Surround Sound Systems


  • 10.2 Surround Sound Systems

10.2 channel surround is the future surround sound technology that Developed by THX corporation, the name itself, 10.2 is an advanced version of 5.1 technology but 10.2 is twice as good as 5.1. In a 10.2 surround sound 14 channels are used. This includes five front speakers, five surround channels, two LFE and two heights, plus the addition of a second sub-woofer. This technology is considered as future TRUEHD.The Diagram of a 10.2 TrueHD setup is shown below.

10.2 Surround Sound Systems
10.2 Surround Sound Systems

Figure From

So far we talked about latest sound systems and the technologies behind. Often this type of technology is found in high end sound bar home theater speakers. Now lets take a look at surround sound formats.

Common Surround Sound Formats

  • Dolby Surround

Dolby surround is the consumer version of Dolby analog film decoding. This technology was introduced in 1982 which is capable of handling stereo and hi-fi audio. This audio format is commonly found in VHS and stereo hi-fi systems. In this surround format, the multichannel audio multiplexed into two audio channels (left and right channels)and decoded by using Dolby pro logic decoder ,then it recreates the four channel Dolby surround experience.

  • Dolby Digital

Dolby digital is the standard surround sound format which provides high quality and highly realistic experience. This audio is developed by Dolby Corporation. Dolby digital audio is also known as Audio Codec-3(AC3). This audio format provides a high quality 5.1 surround experience. Normally this audio format used for the creation of DVD and Blue ray movies. Some video games and play station units are also available in this surround sound format.

  • Dolby Digital EX

Dolby Digital EX is the modified version of Dolby digital audio. This extended format contains an additional surround sound unit (called center surround channel) for creation of more realistic experience. Dolby digital EX needs Dolby EX decoder. This surround effect also support 5.1, 6.1, 7.1 channel playback. This audio format usually available on DVD, HVD, blue ray, play stations, DTV broadcasts, etc .

  • Dolby Pro Logic IIx

Dolby Pro Logic IIx is an advanced version of Dolby Digital EX technology. By using this technology, we can expand the 5.1 channel Dolby surround system into 6.1, 7.1, 10.2 channel surround. The Dolby digital prologic usually use three modes for listening (movie, music and game modes).This surround technology provide more rich  and depth surround sound effect   than conventional surround sound system. This audio is normally encoded in DVD, HVD, BRD HDTV, play stations,  etc.

  • Dolby True HD

Dolby True HD surround sound is an advanced version surround sound that provides incredible High Definition experience to the listener. This surround sound format is also known as next generation surround sound format. Dolby True HD format only support HD based media and this technology provides 100% lossless audio encoding, bit rate up to 18Mbps and support 8.1 or higher channel with 24 bit/96Khz audio. This format also supports HDMI. Normally BRD and HVD are used for encoding this true surround.

  • DTS

DTS is another digital surround format developed by DTS Corporation. It is a Multichannel digital surround format widely used in both consumer and commercial applications. The DTS audio system must have a DTS decoder and optical/coaxial digital decoder for decoding this surround. DTS is normally available in a single channel multiplexed format (2.1 to 11.1 channel surround sounds can be multiplexed into a single optical digital or coaxial output format).DTS format  is also available on DVD,HVD and BRD’s.

  • DTS-ES

DTS-ES (digital theater sound –Extended Surround) is an advanced version of normal DTS. This surround system is usually available in 6.1 or higher channels. This provides us with more true digital experience than conventional DTS system. This unit also requires an additional DTS-ES decoder for the creation of a back-surround effect. The system is compatible with all current extended surround formats and an auxiliary surround channel is also provided for other applications.

  • TruSurround-XT

TruSurround XT is the next generation of SRS TruSurround. The main advantage of this surround system is that it’s capable of handling 2.1 channel surround to 10.2 channel surround (support head phone media too).Audio is encoded in multiplexed format. and require DTS true surround decoder. This audio usually encoded in BRD’s and HVD’s



  1. kantharaj

    Dear sir/Madam,
    kindly can anybody give logitech z506 surround sound 5.1 multimedia speakers right front DB9 pinout diagram,
    thanks in advance

  2. siaran satelit

    looks like a movie theathre at our home… anyone has the diagram for 5.1 ?

  3. B. Mabu Hussain

    How to assemble 5.1 home theatre full diagram. Then attach any images and videos.

  4. How can I add Dolby, DTS, Prologic, SRS, THX in my circuit…



  6. Nathan R. Johnson

    What if the ‘room’ in question is the salon of a 37′ sailboat? Distance from optimum viewing position to screen is 8′ or less. ceiling height is 6′ 3″ Mostly teak surfaces. right now I use 120v home theater system at the dock but cruising I would need 12 volt.

  7. please give a circuit for 7.2/10.2 Surround Sound systems
    simple circuit with power supply,
    can b assemble at home.

  8. haz clic aquí

    Thanks for finally talking about > Multi-Channel Surround Sound Systems – 5.
    1,6.1,7.1,10.2 surround sound < Liked it!

  9. Hi thanks lot in this article i came to know many things. And pls give me a 10.2channel amplifier circuite design and components used and pcb layout. Plz help us send to my mail.

  10. i want circuit model for the 10.2 speaker…….

  11. Hi, thanks a lot to team, I got so many things through this scripts. I need circuit for optical sound input to decode 5.1output circuit. Pls update it as soon as possible. Thank you

  12. Eloectronics Projects

    great post about Multichannel sounding system .and good description

  13. Kaycee Welder

    What is the difference between current feedback amplifier and voltage feedback amplifier ?

  14. When watching free view HD using the new multichannel audio system to HDMI instead of optical link for the 5.1 surround sound tends to go off and all the channels on the display tend to restart on Channel 4 HD and I think a couple of times on BBC HD as anybody else experience this as I have had my receiver back to the technicians twice and can’t get to the bottom of it so I need to know is it the broadcaster who is playing with the sound

  15. How can we convert the old ‘floppy disc’ connection to ‘pen-drive’? All those who are using electric organs with floppy disc are finding it difficult.

  16. at which impedance do i have to consider? is it, input transformer, output transformer, or the speakers?…

    my output transformer power rating is at 50Watts and it ranges from 4-16 ohms, my four speaker is at 6 ohms each, 100 watts…i connected them in pair to left and right channel respectively, each pair is in series to make 12 ohms,…..

  17. if i will remove the regulator…humming will appear…

    maybe power transistors of my booster will saturate….isn’t it??? or my output transformer??? what do you think??? because, i made an experiment, when i remove the booster amplifier and put speaker directly to main amplifier, everything is ok…it sounds clearly, but then it has low output power…… what should i do????

  18. @ mike
    Which regulator you are used? If you are using only a 12v regulator ic, it cant handle the current reting of the amp. I think 12v 6A transformer rectifier is enough. No need any regulator.usually 12v amp can handle 12v to 14.5v dc .

  19. hi….i have a problem with my main amplifier driven with transformer coupled booster amp., the sound is ok at a mid volume, but when i increase it the voltage accross my amplifier suddenly drops to 5 volts from 12 volts and partially turn my amp. off specially when i increase the bass and on when voltage back to 10V…

    voltage requirement for my amp. is 12 volts at 3A… main power supply is 12V, 6A……

    can you help me again……

    i added a voltage regulator to maintain it at 12V, but then it will drop approx. 6V…

  20. hi seetharaman,is it ok to incorporate your 100watts lowpass filter using opamp to have an output for subwoofer??

    and what appropriate value of amperes of transformer to be needed?…thanks

  21. Seetharaman

    Hi Mic you have to add a sub woofer filter for .1 you will get 4.1

  22. @VYSAKH,

    i mean with my existing front R-L frequencies a circuits that will divides or filter frequecies for R-L surrounds, center and subwoofer making it 5.1 channel….

  23. @mike
    Did you mean multichannel splitter circuit?

  24. Hi there, do you have some additional circuit use to generate multichannel and incorporate it with existing two channel(Right and Left)???

    other suggestions?………

  25. Hai Sir,i have a cell phone in which i wont get network signal inside my house, but perfect when outside. Is there any circuit that can bring/get signals in side my house?

  26. Seetharaman

    Hi Yogesh i have sent you the first part as an introduction

  27. Seetharaman

    Hi Yogesh kumar it is a big subject you send your mail to me i will reply you in detail, as there is space for such a long article in this comment column.


    what is basic different between one chnanel & multi channel sound system ?? i know about only left & right channel.

    What is the difference between mono and stereo..plz tell deeply.