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 10 of 30
Legatia L4SE Carbon Midbass
History
The Legatia L4SE Carbon’s topology is a derivative of the massively successful Legatia L4SE
transducer which was first launched in August 2010.
At the onset of the Legatia SE Carbon program, the purpose for the series was to be an exceptionally
high-end option for shallow-depth midbass drivers to be used specifically in German automobiles, and
in other vehicles where typical-depth high-quality midbass drivers would not fit, and where depth was
at a premium. By early Spring 2011, a beta prototype pair of Legatia L4SE Carbon’s had been
refined after hundreds of hours of testing and development; these highly-evolved drivers were sent to
close industry affiliates for third-party testing and evaluation, specifically in the Porsche 928 vehicle
platform as a dedicated door-mounted midbass, paired with a low-resonance tweeter. After countless
hours testing the speakers under various circumstances, and four full revisions of the Carbon L4SE,
final approval was given. Production refinements were mid-Summer of 2011, to incorporate features
inclusive and proprietary to the Legatia SE Carbon line, and final production commenced August
2011. The Legatia L4SE Carbon was launched in October 2011 and is the reference 4.65-inch
dedicated midbass driver in Hybrid Audio’s product category known collectively as the Legatia SE
Carbon Series.
Attributes
The Legatia L4SE is a 118mm (4.65-inch) midbass driver to compliment both two-way and three-way
system designs, where a shallow-depth, long-throw, small-format midbass is required. The following
are the L4SE Carbon’s design attributes:
Basket
The basket of the L4SE Carbon is a shared design with the Legatia L4 and Legatia L4SE for easy
change-out potential; the L4, L4SE, and L4SE Carbon are interchangeable in mounting topology.
The basket is a high-quality cast aluminum design, and contains a 118mm flange providing for the
mounting of the driver via four screw holes (the use of 3mm cap head screws is ideal). The overall
dimensions of the driver are very amenable for use in the car audio environment, and in locations
typical of the standard “4-inch” driver, or in custom locations at the discretion of the end-user,
boasting a depth of just 42mm (1.65-inch) (16mm less than the Legatia L4SE). 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 L4SE 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 L4SE Carbon being able to accurately track the input signal. Reduced distortion and greater
dynamics are the immediate sonic benefits. The motor of the L4SE Carbon includes an opposing