Hybrid Audio Technologies Legatia-Series, User Manual

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Legatia User’s Manual ©Hybrid Audio Technologies Page 34 of 65
typical of the standard “8-inch” driver, or in custom locations at the discretion of the end-user,
boasting a depth of 94mm (3.7-inch). The basket features large openings behind the cone to
eliminate chuffing and other aerodynamic-based noises, as well as provides adequate communication
to the back of the cone for acoustic suspension and proper operation.
Motor
The motor of the L8V2 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 18mm of two-way linear excursion,
resulting in the L8V2 being able to accurately track the input signal. Reduced distortion and greater
dynamics are the immediate sonic benefits. The motor of the L8V2 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 L8V2 is a large 35.55mm (1.4-inch), which is the proper balance
between size and moving mass in super high-end mobile audio midranges/midbass. 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 well above the usable range of the L8V2. 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
L8V2, as our approach to point-sourcing is to allow the Legatia midbass/midrange driver to effectively
play into upper midrange and lower treble frequencies. The Legatia L8V2 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 L8V2 has an
outstanding extended frequency response; the usable frequency range of this driver exceeds six
complete octaves of usable bandwidth on-axis (40 Hz – 3,800 Hz). Even off-axis, the L8V2 faithfully
recreates more than five full octaves of information, for the ultimate “large-format” midrange/midbass.