Hybrid Audio Technologies Legatia Pro - Manual (Page 5)

Legatia Pro User’s Manual ©Hybrid Audio Technologies Page 5 of 43
Legatia Pro Speaker Design Considerations
The Legatia Pro-series component speakers are electrodynamic drivers that are comprised of a dome
diaphragm that is set in motion by a motor system that has both electrical and mechanical
components.
The following design tenets are typical of all Legatia Pro-series midrange drivers:
Motor
The motor of the Legatia Pro midrange transducers are paramount to the performance of the drivers,
providing for a flat and wide BL curve. The BL curve is flat and extended in all models, yielding
exceptional two-way linear excursion, resulting in the Legatia Pro midrange drivers being able to
accurately track the input signal. Reduced distortion and greater dynamics are the immediate sonic
benefits. The motor of the L3 Pro includes a high-grade NdFeB magnet assembly to improve
restorative force, compliance, motor strength, displacement, and power handling, but also to serve a
small diameter form-factor. The voice coil fully surrounds the magnet.
Voice Coil
The voice coil diameter of the Legatia Pro range of midrange drivers represents the optimal balance
of diameter, power handling, and moving mass. The L3 Pro uses a 50.5mm (2-inch) voice coil. The
voice coil diameter serves several key functions: elevated power handling, dissipation of heat
(thereby lowering power compression), and maximizing the size of the magnet assembly for
enhanced motor compliance. The voice coils used in all Legatia Pro designs are copper-coated high-
purity aluminum winding, which is superior to a solid copper winding for heat dissipation, as well as
significantly reduced moving mass. The result is an extremely light weight winding with good power
handling and low inductance.
How much amplitude a speaker can reproduce depends on the volume of air it excites without
overheating. The volume of air that a speaker excites is determined by the surface area of the dome
and the excursion capability of the motor system. Xmax is defined as the width of the voice coil that
extends beyond the front plate, and relates to how far the speaker can move in either direction
without appreciable distortion. The Legatia Pro dome midrange designs boast exceptional one-way
linear excursion (Xmax).
Dome
The shape, weight and strength of the Legatia Pro midrange domes relate directly to the extended
frequency response of the Legatia Pro range of drivers. The Legatia Pro domes are convex-shaped
hybrid fine fabric Japanese cotton diaphragms, described below. A considerable effort was allocated
to create a convex diaphragm with exceptional modal damping to have a smooth band-to-band
frequency response, applicable in both on- and off-axis applications.
You will find no composite or metal cone materials used in any Legatia Pro midrange driver. Our
approach to point-sourcing is to allow the Legatia Pro midrange drivers to effectively play into treble
frequencies; having virtually all imaging cues emanating from one set of drivers in an installation
ensures stable stereo imaging across the fundamental frequencies which define image placement