A rigid, flat plate diaphragm for an acoustic device is illustrated. The wiring hub provides a centralized chassis containing a plethora of connectors for power distribution to each peripheral and the main unitterminal and for communication between each peripheral and the main terminal. A maximum distance between the airbag sections is dependent on a degree the airbag is filled with the distance decreasing as the airbag is filled. A linkage in the saw converts rotary motion of a motor into synchronous, counter-reciprocating motion of the blades about the axis.