Advanced Loudspeaker Application Development Project

Multiple-Degree of Freedom Cavity Resonator System

Project MCAP-CR


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You will find uncovered feature of bass-reflex loudspeaker enclosure. There are great features.

Wide-Range, Clear resolution in low frequency range, Rennovation, Multiple-Degree of Freedom, Model Based Approach
The world of multiple-degree of freedom applications will attract you!

Shigeru Suzuki


I found that 33Hz is the practically sufficient low end.
Characteric frequency of a bass drum is 33Hz or higer.
You may not hear sound below 33Hz if with orchestra.
Try listening Saint=Saens's 3rd Symphony in an orchestra hall.
It has super low frequency to 16Hz, but you cannot hear it, though your skin may detect it.
What you can hear is 33Hz and higher if with orchestra.
33Hz is easy for MCAP-CR applications with 5" driver.
Below 33Hz is much more difficult with an audio system.

Try 5" an application at reasonable cost.


Commercial use is welcome.
Commercial use of the idea of this patent may be authorized for free for a limited volume with written contract.
There are following conditions for commercial users as below:
  • Make the contract.
  • Indicate the authorization of the patent & its information.
  • Develop the manufacturer's own design. Ask the patent holder for technical help, if necessary.
  • Conditions above may change without prior notice, while future change does not void existing contract.

    Use of provided software for design, research and development is permitted for free.
    Refer to each software license agreement.

    Terms & Conditions to Use MCAP-CR

    MCAP-CR is patented by Japan Patent Office (patent# 5083703).
    You may not use MCAP-CR for commercial purpose without contract, while you are allowed to make MCAP-CR applications for evaluation puropse.
    This is personal small laboratory. Any kind of financial assistance is appreciated.
    Use "Send Message" option in the top-left menu to contact me. Have good business with me.

    Shigeru Suzuki, Patent Holder