About Layered Sound Technology
Natural sound manifests two types of sound-waves: binaurally correlated and binaurally de-correlated waves. Binaurally correlated soundwaves are highly coherent, and among other things, permit us to determine where a sound source is located. Binaurally de-correlated soundwaves are highly incoherent, and among other things, permit us to estimate our distance from the source, or the nature and size of an acoustic space. The main problem with loudspeakers is their inability to propagate sound with both wave-types. This is an engineered limitation inherent in the mechanical nature of the devices themselves. Conventional cone loudspeakers propagate longitudinal waves. Longitudinal waves are highly coherent and binaurally correlated. Resonating DML type loudspeakers are transverse wave loudspeakers. Transverse sound waves are highly incoherent and binaurally decorrelated. It is simply impossible to propagate transverse waves with a conventional loudspeaker and conversely, it is impossible to propagate longitudinal waves with a resonating panel loudspeaker. No amount of DSP, loudspeaker placement, room treatment or other adjustments will change this simple fact. To reproduce natural sound, both types of loudspeakers are required.
Layered Sound is the term used to describe the process of combining a conventional and a distributed mode loudspeaker, to produce the same audio signal. This combination, when used in the correct configuration, delivers to the listener sound that is clear, spacious, better imaged and more pleasant to listen to
Layered Sound¢â is a patented, innovative method of using two types of loudspeakers- conventional cone and Distributed Mode (flat-panel). Each type of speaker has a natural strength. Layered Sound fully exploits these strengths to produce a uniquely superior and natural sound. It also simultaneously masks the respective weaknesses of the two types of speakers.
The correct balance between direct and reflected sound is very desirable. When we listen to acoustic instruments in a concert space, we hear a blend of direct and reflected sounds. This combination creates the immersive effect we all enjoy and instinctively recognize as a natural sound. Unfortunately, conventional loudspeakers do not provide good reflected sound due to destructive interference and DM loudspeakers do not provide good direct sound due to their diffuse nature of transmitting sound. Not every loudspeaker is ideal for generating both direct and reflected sounds. However, conventional loudspeakers are well suited for direct sound and Distributed Mode loudspeakers are well suited for reflected sound. By combining these speaker designs according to the principles of Layered Sound, air disturbance patterns are created that physically emulate the sound waves of acoustic instruments, a natural sound. As a result, Layered Sound provides smooth diffusion, clarity and depth in any size room.
Architectural applications of Layered Sound include music/film/drama theatres, conference halls and large or small rooms. Activities in these spaces include recorded sound that is amplified and reproduced, live sound that is reinforced, and a mix of recorded and live sound. The venues may be acoustically dry or reverberant, both presenting their own advantages and problems.
Some of the common problems associated with large spaces are related to clarity, diffusion, and frequency response. Layered Sound is particularly effective at smoothing frequency response and creating a blanket of diffuse and evenly dispersed sound. It also maintains or improves the imaging and the localization of sounds. The result is a marked improvement in clarity, intelligibility and overall sound quality. This improvement is independent of whether the sound source is live, recorded or a mix of the two.
Why Layered Sound?
  • 1. the difference is easy to hear
  • 2. the difference can be measured (for those who don't believe their ears...)
  • 3. it's easy to demonstrate
  • 4. it can be demonstrated on location
  • 5. it's easy to install
  • 6. it can reduce the cost of an installation by reducing man-hours and materials
  • 7. it provides the option to upgrade existing systems, rather than to replace them
Shelley Katz
Academic Qualifications
PhD Cognition of Expression in Music University of Surrey
Mmus Piano Performance Julliard School
Bmus(Hon) Piano Performance Julliard School
Short List of performances(In last 10 years - Sololist & Accompanist)
London Wigmall, St. John's Smith Square, Purcell Room, and a performance for her majesty Queen Elizabath II
Berlin Believe Castle
(command performance for president von weizecker)
Vienna Musikverein
Tokyo Suntory Hall
Accompaniest to
Nokolai Gedda, Dame Gwyneth Jones, Katia Ricciarelli, Jochen Kowaiaski, Dachmar Schellenberger, Jonathan Veira
P.newell, Katz. S: Dicrete Layered Sound - given at Institute of Acoustics
Conference Oxford, 2006 OCT
& 5 more published paper
Dr. Shelley Katz / Canada)
PCT/GB03/000323 - Layered Sound (Granted 2007)
New UK Patent Application 0618326_3 - Wave panel (Newly Filed)
Layered Sound ¨Ï 2014