Multichannel Technologies

SRS has technologies that creates a dynamic multichannel and virtual surround sound experience from any audio source. Discover how SRS technologies deliver amazing multichannel and virtual surround sound from your favorite music and movies with our suite of patented audio enhancement technologies including; Circle Surround II, Circle Surround, TruSurround XT, TruSurround.



The 6.1 Matrix Surround Decoding System


Circle Surround II (“CS II”) is a high-performance 6.1 channel matrix surround sound decoding system. It is the next-generation of the company’s original Circle Surround technology, incorporating powerful industry-first features including our proprietary dialog clarity enhancement technology and added cinema-like bass to the front channels and subwoofer.

Dialog Clarity: CS II is the only matrix surround sound technology that includes a new Dialog Clarity feature for movies and television programming. Acting as a "lens" for audio, this feature makes dialog in content such as DVD movies and digital satellite and cable programming pop out of the surround audio effects, allowing the listener to easily discern what the actors say.

Cinema-like Bass: CS II is the only matrix surround sound technology that includes a new patented bass enrichment feature, for the L, R and LFE channels, producing an incredible heart-pounding cinema-like listening experience. Based on SRS Labs' patented TruBass technology, the listener perceives the bass produced by the speakers to be an octave below the actual physical capabilities of the speakers adding exciting, deeper bass effects to any program or game.

Original multichannel content or "programming" can also be encoded into two channels (the same space required for stereo), then stored, broadcast or streamed as two channels over stereo infrastructures such as radio and internet broadcasting, satellite transmission or cable and television broadcasting. Once delivered to the end listener, the CS II decoder can then convert the two channels of CS-encoded content back into 6.1 channels with Dialog Clarity and TruBass enrichment for playback over 6.1 multimedia or home theater speaker systems.

Additionally, CS II is an extremely versatile surround decoder able to deliver up to 6.1 channels of full-bandwidth audio with incredible rear surround separation from mono, stereo, Dolby Surround and Circle Surround-encoded material. This backward compatibility allows consumers to take full advantage of their home entertainment systems when playing CDs, watching a video, or watching digital and satellite broadcast or television.

Circle Surround-encoded material can be fully experienced using a CS II, CS, Dolby Pro Logic or Dolby Pro Logic II decoder and a multimedia speaker system. Otherwise, it is played back in rich, vibrant stereo.

Benefits of CS II:

  • Full multichannel surround can be realized from CS-encoded, Dolby Surround-encoded, non-encoded stereo, and mono sources
  • Delivers crystal clear dialog clarity to movies and TV programming allowing the listener to easily discern what the actor says
  • Provides impressive deep, rich, heart-thumping cinema-like bass
  • Adds rear center surround channel allowing up to 6.1 channels of audio during playback
  • CS II can also be applied to Dolby Digital and DTS decoders, providing dialog clarity and enabling dramatic, cinema-like bass enrichments
  • Improved channel separation from Rear-to-Rear channels and Rear-to-Front channels
  • Provides a more immersive surround sound experience with broader sweet spot than other discrete multichannel technologies currently available


The Rock
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CS II Technology Overview


Pearl Harbor
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CS-encoded material can be fully experienced using a CS II, CS, Dolby Pro Logic or Dolby Pro Logic II decoder and a multimedia speaker system. Otherwise, it is played back as rich, vibrant stereo.

Click to view complete product list with Circle Surround II


The 5.1 Matrix Surround Decoding System Top

Virtual Surround Sound With Dialog Clarity, Increased Bass and Expanded Soundstage Top




TruSurround XT is a feature-rich virtual surround sound technology that is based on and builds upon the company’s popular TruSurround technology. TruSurround XT adds three unique SRS audio enhancement techniques; Dialog Clarity, TruBass bass enhancement and the company’s award-winning WOW stereo audio enhancement technology that produces an immersive sound experience from standard stereo material. By including the proprietary dialog clarity enhancement technology, TruSurround XT enables the listener to more easily and clearly understand television and movie dialog despite the competing environmental noise and sound effects of the background. Additionally, TruSurround XT features a patented cinema-like bass technology providing the perception of deeper, richer low bass tones. With TruSurround XT, consumers will realize the full experience of Dolby Digital, Dolby Surround or DTS encoded programming over their computers or through the use of two-speaker audio systems and headphones.

Dialog Clarity - TruSurround XT includes an exciting new audio technique that acts much like a lens does for vision, bringing movie dialog into “focus” during the playback of any surround-encoded material such as DVD movies and satellite and cable television programs. Speech and center dialog becomes much clearer and crisper, making it easier to discern from today’s sophisticated movie effects.

TruBass - TruSurround XT uses SRS hear amidst TruBass technology to create incredible deep rich bass from all speaker types, including headphones. This patented technique, based on psychoacoustic theories of the human hearing system, allows a person to perceive significantly deeper, richer low bass tones that are far beyond the physical low frequency capabilities of the speaker itself.

Incredible Stereo with WOW - TruSurround XT goes a step beyond the standard TruSurround technology by processing standard two-channel stereo material as well as multichannel encoded material. SRS WOW technology literally “WOWs!” anyone who hears it by creating a soundstage that spreads the image upward and all around, making this a incredibly dramatic improvement in the playback of any stereo audio over a two-speaker system.

TruSurround XT Headphone – This technology provides a surround sound listening experience over headphones. When listening to multichannel content such as DVD movies over headphones, the listening experience is fundamentally different than listening to speakers. Since the headphone speaker drivers are covering the outer ear, the listening experience differs greatly from traditional speaker playback. TruSurround XT uses patented headphone perspective curves to solve this problem and provides a non-fatiguing, immersive, home theater listening experience. TruSurround XT Headphone also delivers exceptional 3D audio from mono and stereo material.

Benefits of TruSurround XT:

  • Carefully places content in the correct location paying special attention to center channel dialog placement
  • Provides a wider and more dynamic sound stage
  • Improves the listening experience with added bass
  • Creates a broad sweet spot for a realistic experience
  • Instantly improves the surround sound listening experience for the majority of consumers who do not have 5.1 speaker systems
  • Works great in any room no matter what the furniture configuration
  • A must for portable DVD players
  • Simple implementation for satellite and cable set-top box manufacturers


Apollo 13
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TSXT Technology Overview

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True Virtual Surround Sound From Just Two Speakers Top


TruSurround is SRS Labs’ original virtual surround sound technology that delivers a full and immersive virtual surround sound experience from any two-speaker playback system, including a stereo television, using any multichannel audio source such as Dolby Digital, Dolby Surround or Dolby Pro Logic.

While digital audio provides unparalleled quality, multiple speakers must be used in order to “surround” the listener and take full advantage of the 5.1 separately encoded audio channels. With TruSurround, the six discrete channels of digital audio are processed into just two channels and delivered over two speakers giving the listener a completely immersive experience and the sensory perception that they are surrounded by additional “phantom” speakers.

Manufacturers of DVD players, televisions or digital satellite or cable set-top boxes can license TruSurround for use in their products to create virtual surround sound experiences for their customers who do not have 4.1 or 5.1 speaker systems connected.

Benefits of TruSurround:

  • Carefully places content in correct location paying special attention to center channel dialog placement
  • Creates broad sweet spot for a truly realistic experience
  • Instantly improves surround sound listening experience for the majority of consumers who do not have 5.1 speaker systems
  • Works great in any room no matter what the furniture configuration
  • Simple implementation for satellite and cable set-top box manufacturers


Hollow Man
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TS Technology Overview
TS Technical Description

Click to view complete product list with TruSurround





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