Audio transducer apparatus

DETAILED DESCRIPTION What i claimed is: 1.
Transducer apparatus for transmitting electromagnetic signals to a wall, comprising, in combination: housing means for holding electromagnetic elements, including a base housing having a back portion, a voice coil extending inwardly from the back portion, and having a first diameter, for providing an electromagnetic output in response to an electronic input signal, a rear boss portion extending outwardly from the back portion of the base housing to the wall, having an outer surface disposed against the wall and having a pinched waist reduced diameter portion between the back portion and the outer surface which has a second diameter which is less than the first diameter of the voice coil, first magnetic element means disposed in the base housing and responsive to the output of the voice coil for providing a first output, a bore in the first magnetic element means into which the voice coil extends, a top housing secured to the base housing, and means for securing the first magnetic element means to the base housing; means for securing the housing means to the wall; and means for providing an electronic input signal to the voice coil to provide an output transmitted to the wall from the first magnetic element means.
2.
The apparatus of claim 1 in which the housing means further includes a generally convex outer surface on the rear boss portion.
3.
The apparatus of claim 2 in which the housing means further includes concentric grooves and ridges on the generally convex outer surface.
4.
The apparatus of claim 1 in which the housing means further includes second magnetic element means for providing a second output, and means for connecting the second magnetic element to the means for providing an electronic input signal.
5.
The apparatus of claim 4 in which the second magnetic element means is secured to the top housing.
6.
The apparatus of claim 5 in which the second magnetic element means comprises a tweeter.
7.
The apparatus of claim 1 in which the means for securing the housing means to the wall includes a screw element secured to the wall and to the rear boss portion