For over 100 years, the dynamic loudspeaker has undergone many changes in shape, style, impedance and materials, but one constant has remained: a speaker’s diaphragm—the main part that moves air—needs to be directly coupled to open air for any appreciable sound to be created in volume.
This requirement of a speaker opening (for efficient use) can introduce undesirable aspects into products and devices where speakers are integrated. Be it the changed aesthetics of an otherwise slick, sleek design or the introduction of the product to hostile environment variables such as rain, dust, vandalism, or sunlight exposure.
With the introduction of PUI Audio’s new line of Audio eXciters, many of the challenges that design engineers now face when integrating audio can be overcome without sacrificing output.
Audio exciters are built on the same principal as speakers, where there is still a permanent magnet and a moving voice coil to generate sound, directly proportional to an audio signal. However, that is where the similarities end. A speaker relies on the diaphragm (attached to the voice coil by a former) to modulate air and make sound.
Exciters, instead, rely upon the voice coil being coupled directly to the inside surface of an object, transforming that object’s outer surface into an invisible, protected speaker by imparting vibration from the exciter’s moving mass into the surface.