Journal Forum

Synthetic Reverberator - January 1960

Sound Board: High-Resolution Audio - October 2015

Synchronized Swept-Sine: Theory, Application, and Implementation - October 2015

Access Journal Forum

AES E-Library

Coaxial Flat-Plane Loudspeaker with Polymer-Graphite Honeycomb Sandwich Plate Diaphragm

Document Thumbnail

The coaxial flat-plane loudspeaker is a new approach to direct-radiator plane diaphragm loudspeakers and provides improved performance not obtainable from conventional designs. 1) Sound imaging is enhanced by keeping the broadening of the sound source to a minimum. This feature was realized by coaxially monting four flat-plane diaphragm loudspeakers, each handling a portion of the total sound spectrum from near subsonic frequencies up to superosnic frequencies so that the acoustic centers of all four radiators are aligned in one plane. This causes the arrival times and sources of sounds from all diaphragms to be equal. The time delays between all frequencies can therefore be held to a minimum. 2) A flat and smooth frequency response has been obtained by eliminating the conventional cone diaphragm's cavity with its inherent resonances and break-up frequency characteristics. 3) Piston motion over a comparatively wide range of frequencies has been realized by adopting a sandwich-type construction consisting of two polymer-composite sheets with an aluminum foil honeycomb core bonded in between. The polymer-graphite skin material is designed to have a high internal loss factor, while the core material ensures high flexural rigidity. This construction yields a plane diaphragm which maintains piston motion over a wide range of frequencies with flat frequency characteristics and excellent transient response.

JAES Volume 29 Issue 11 pp. 800-807; November 1981
Publication Date:

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:

Start a discussion about this paper!

Facebook   Twitter   LinkedIn   Google+   YouTube   RSS News Feeds  
AES - Audio Engineering Society