19
In the real world, distortion from a transducer is roughly proportional to
displacement. The longer the throw (or smaller the piston area) required to
generate a given volume displacement, the greater the distortion
generated for that given displacement (or loudness level). Let’s look at a
simple equation for the volume displacement of a circular piston.
Volume Displacement = Travel x Surface Area
As you can see, if we want to keep travel at a minimum, then surface area
must increase accordingly. In fact, for a given size piston, displacement
requirements increase by a factor of FOUR every time we drop one octave
in frequency. Its now quite clear that the ideal model should be revised to
one which maintains constant directivity while increasing in piston area
with falling frequency.
The Classic loudspeakers dedicate dual 10” carbon-filled bass drivers with
a total of 20 pounds of motor structure and a free air resonance frequency
of 18 Hz. The midbass is picked up by an ultra-quick 7” Kevlar® Hexacone
with graphite frame.
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