Distributed mode loudspeaker
The Distributed Mode Loudspeaker(DML) is a new flat panel loudspeaker whose electrical, mechanical and acoustical properties are drastically different from standard dynamic moving coil loudspeakers.
Technology
The technology is researched by NXT The DML consists of a thin panel that is vibrated by a special electro-acoustic exciter. Sound radiation is due to uniformly distributed vibration modes in this panel. Exciters include, but are not limited to, moving coil and piezoelectric devices, and are placed to correspond to the natural resonant model of the panel.
Advantages
- Broad frequency range (100 – 18000 Hz for 0.6m2 panel).
- Smaller fading with distance. Example: 3.5 meter distance 4dB for — DML; 11dB — dynamic moving coil loudspeakers.
- The air radiation resistance is small and constant with frequency. This means that directivity is not affected by size of speaker.[1]
- Bipolar (radiates sound in 2 directions), but may be made forward directed.
- Flat, may be produced in different shapes, may be decorated etc.
- Some DML units are designed to be plastered into walls and completely hidden.
- Don't require enclosing.
Disadvantages
- Problems radiating low frequencies. Increase in size makes it possible to radiate sound with lower frequencies.
Compatibility
Some of DML are compatible with traditional amplifiers[2]
Special applications
DML-panels are well suited for Wave field synthesis purposes because they are light and can be placed close to walls[3]
References
- ^ ""A flat response" by Peter Mapp, svconline.com". Retrieved 2007-02-10.
- ^ "Offical FAQ". Retrieved 2007-02-10.
- ^ ""On The Applicability of Distributed Mode Loudspeaker Panels for Wave Field Synthesis Based Sound Reproduction",Marinus M. Boone and Werner P.J. de Bruijn" (PDF). Retrieved 2007-02-10.