Hybrid Audio Technologies Legatia-Series, User Manual

Page: 16 / 65

Legatia User’s Manual ©Hybrid Audio Technologies Page 16 of 65
Motor
The motor of the L3V2 is paramount to the performance of the driver, providing for a flat and wide BL
curve (as a learning note, BL is the equivalent of torque in a car; a car with a flat and constant torque
curve provides much better acceleration and performance than a car with a peaky, non-constant
torque curve). The BL curve is flat and extended, yielding 6mm of two-way linear excursion, resulting
in the L3V2 being able to accurately track the input signal. Reduced distortion and greater dynamics
are the immediate sonic benefits. The motor of the L3V2 includes a high-energy strontium magnet
with an opposing high-grade NdFeB magnet at the top of the magnetic gap to improve restorative
force, compliance, motor strength, displacement, and power handling. The magnet assemblies fully
surround the voice coil.
Voice Coil
The voice coil diameter of the L3V2 is a large 25.5mm (1-inch), which is the proper balance between
size and moving mass in super high-end mobile audio midranges/full-range drivers. 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 coil is high-purity aluminum, which is superior to copper 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.
Suspension
The inverted surround is butyl rubber which is highly consistent, and does not suffer the variance of
natural rubbers. This rubber surround terminates mechanical vibrations well, having a low stiffness
for positive damping of resonances. The spider material was chosen for optimal performance; the
spider is a 90/10 cotton/Nomex blend with single-dip low viscosity phenolic. This material provides
the stiffness desired without being overly brittle or stiff, where vibrations in the spider are well damped
and do not translate into the former or the cone.
Cone
Like other Legatia midrange designs, you will find no composite or metal cone materials used on the
L3V2, as our approach to point-sourcing is to allow the Legatia midbass/midrange driver to effectively
play into upper treble frequencies. The Legatia L3V2 is a cone-type driver consisting of a proprietary
hybrid paper diaphragm with extremely low moving mass. Paper is widely acknowledged as the best-
damping material, as it provides the near optimum balance of strength and weight. The cone has
been treated with a water resistant element at the rear to accommodate door mounting, or other
areas prone to
occasional contact with liquid. The cone design offers a wide dispersion pattern to
make for flexible installation and speaker location. The Legatia L3V2 has an outstanding extended
frequency response; the usable frequency range of this driver exceeds seven complete octaves of
usable bandwidth on-axis (140 Hz – 18,000+ Hz). Even off-axis, the L3V2 faithfully recreates more
than five full octaves of information, for the ultimate “small-format” midrange/full-range driver.
Phase Plug and Shorting Rings
The L3V2 comes equipped with a phase plug pole piece extension at the center of the cone, which is
one of the more notable enhancements of the L3V2 over its earlier sibling the L3. The phase plug is