Hybrid Audio Technologies Legatia L4SE Stage VI Carbon, Specifications Library & Car Audio Reference Manual

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Legatia SE Carbon User’s Manual ©Hybrid Audio Technologies Page 17 of 30
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 L6SE 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 12mm of two-way linear excursion,
resulting in the L6SE Carbon being able to accurately track the input signal. Reduced distortion and
greater dynamics are the immediate sonic benefits. The motor of the L6SE Carbon includes an
opposing double-stacked NdFeB magnet to improve restorative force, compliance, motor strength,
displacement, and power handling. The magnet assemblies are fully surrounded by the voice coil.
Voice Coil
The voice coil diameter of the L6SE 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 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 unique double-S shaped surround is treated fine cloth which is highly consistent, and does not
suffer the variance one might find in natural rubbers, foam, or untreated cloth. The 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
As noted in the introduction, the SE Carbon is a complete departure from the typical Hybrid Audio
Technologies philosophy of point-source midbass and midrange (full-range) drivers. The composite
cone, although not ideal for wide-bandwidth operation, does an aplomb job of effectively recreating
midbass and lower to middle midrange tones effectively. The Legatia SE Carbon midbass drivers
include a carbon fiber diaphragm with low moving mass. Carbon fiber is acknowledged as being an
exceptionally strong material, but exhibits edge-mode distortion at high frequency, and therefore
should be appropriately filtered using active crossovers, or custom passive crossovers. By nature,
the carbon fiber cone and dustcap are water resistant.
Hybrid Audio Technologies recommends the use of a low-resonance tweeter to be used in concert
with the Legatia L6SE Carbon, such as the Legatia L1 Pro or Legatia L1 Pro R2. When placing the
midbass and tweeter in close proximity to each other, one can achieve having all imaging cues
emanating from the pair of drivers in an installation, ensuring stable stereo imaging across the