Hybrid Audio Technologies Legatia L4SE Stage VI Carbon, Библиотека спецификаций и справочное руководство по автомобильной аудиосистеме

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Legatia SE Carbon User’s Manual ©Hybrid Audio Technologies Page 6 of 30
immediate sonic benefits. The motor includes an opposing double-stacked 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 opposing
double-stacked magnet.
Voice Coil
The voice coil diameter of the Legatia SE Carbon range of midbass drivers represents
the optimal
balance of diameter, power handling, and moving mass. The L4SE Carbon uses a 25.5mm (1-inch)
voice coil, and the L6SE Carbon uses a 35.5mm (1.4-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 SE Carbon designs are 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.
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 cone
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 SE Carbon designs boast exceptional one-way linear
excursion (Xmax).
Shorting Cup
All Legatia SE Carbon midbass drivers come equipped with copper shorting cups. The shorting cups
consist of an optimally sized and placed cup of copper (Cu) to create a total inductance profile that is
not just low, but flat over stroke, frequency, and power. Inductance is the number one limiter of high
frequency extension and modulation of inductance with stroke, frequency and power, and is the
primary source of intermodulation distortion (IMD).
Cone
The shape, weight and strength of the Legatia SE Carbon midbass cones relate directly to the
authoritative midbass ability of each design. The Legatia SE Carbon cones are concave-shaped
hybrid carbon fiber diaphragms, described below. Convex shaped cones, typical of “dome”
midranges, typically exhibit “peaky” frequency response, so we opted instead on a concave cone
topology for the resultant smoother frequency response. And contrary to common belief, most
convex cones have a narrow directivity pattern. The concave cone of the Legatia SE Carbon
midbass drivers have a wider directivity pattern, and are excellent for use in “off-axis” applications.
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. In concert with a low-resonance tweeter, the ultimate two-way front stage
can be created. When placed in close proximity to a tweeter device, such as the Legatia L1 Pro or
Legatia L1 Pro R2, one can achieve having all imaging cues emanating from the pair of drivers in an
installation, ensuring stable stereo imaging across the fundamental frequencies which define image
placement and definition. The Legatia SE Carbon midbass drivers include a carbon fiber diaphragm