Specifications

The traditional planar magnetic also starts with a thin Mylar
diaphragm, one side of which is coated with adhesive and fitted
with an aluminum wire voice grid, (analogous to the voice coil of
a conventional cone driver). The diaphragm is held taut in a
metal frame. On the front of this frame is a large sheet of
perforated metal, to which rows of vertically aligned strip
magnets have been fastened.
+
-
TO AMPLIFIER
FRAME
DIAPHRAM
VOICE GRID
[ACTUALLY A
CONTINUIOS LOOP]
PERMANENT
STRIP
MAGNETS
PERFORATED
METAL
SHEET
N
S
S
S
N
SINGLE-ENDED PLANAR MAGNETIC
[T OP VIEW CROSS-SECT ION]
Spacing exag g e rated to sh o w d e tail
From there, the operation of a single-ended planar magnetic
loudspeaker is remarkably similar to that of a conventional cone
driver: The amplifier's output is sent directly through the voice
grid and, because it is suspended within a stationary magnetic
field, the grid moves back and forth within that field in
synchronization with the AC voltage that is the amplified music
signal. Since the voice grid is permanently fastened to a taut
diaphragm, the diaphragm also moves in synchronization with the
music signal, exciting the air and producing sound.
Planar Magnetic
Loudspeakers
12