Thank you for your interest in Hybrid Audio

Thank you for your interest in Hybrid Audio
Product Parameters and Specifications
Model: Legatia L8V2 Wide-Bandwidth Midrange/Midbass
Thank you for your interest in Hybrid Audio Technologies’ Stage III wide-bandwidth, point source
Legatia drivers, and specifically, the Legatia L8 Version 2 (L8V2) midrange/midbass. The Legatia
L8V2 is the culmination of an inordinate amount of time and resources spent testing and refining this
product to the exacting specifications of Hybrid Audio Technologies and our long heritage of quality
speakers. We are certain that this product will provide class-leading performance that simply cannot
be beat by competing brands if installed properly.
The Legatia L8V2 – A Brief History
The Legatia L8V2’s topology is an enhanced “version 2” of the massively successful ‘original’ firstgeneration Stage III Legatia L8 transducer, which was first launched in September 2007 to an
enthusiastic reception of car audio competitors, enthusiasts, and car audiophiles. In the years since
its inception, the L8 midbass has been included in several International Auto Sound Challenge
Association (IASCA®) national- and world-championship vehicles; the L8 was debuted initially by David
Brooks in competition, and the first-generation L8 went undefeated in organized competition its first
and second seasons, including the season-ending championships in 2007 and 2008. When it came
time to enhance the L8, we were very cognoscente of the L8’s midbass abilities, and had two general
project objectives: 1) enhance the L8’s ability to effectively reproduce a wider frequency spectrum
for possible application as a dedicated midrange in a two-way application, and 2) to maintain, if not
enhance the L8’s lower-octave authority and impulse response through more displacement and
lighter moving mass. The Legatia L8V2 joins Hybrid Audio Technologies’ Legatia L1V2 as the second
driver in the Legatia series to be enhanced with performance eclipsing the first iteration of each
design. To this end, the L8V2 development began in January 2010, and the first prototypes were
developed by company founder and lead designer Scott Buwalda.
By Fall 2010, a beta prototype pair of Legatia L8V2’s had been refined after hundreds of hours of
testing and development; these highly-evolved drivers were sent to Jim Becker and Jorge Juaristi,
both multiple IASCA and USACi champions for final testing, evaluation, and debut in organized
competition. After countless hours testing on the speakers under various circumstances, both as a
dedicated midbass and as a midbass/midrange in two-way configuration, Juaristi and Becker gave
their final approval. Production refinements were Fall of 2010, to incorporate features inclusive and
proprietary to the SE line, and final production commenced November 2010. The Legatia L8V2 was
Note: specifications are subject to change without notice
Copyright © Hybrid Audio Technologies, Inc. All Rights Reserved.
Product Parameters and Specifications
Model: Legatia L8V2 Wide-Bandwidth Midrange/Midbass
launched in December 2010 and is the reference 8.85-inch driver in Hybrid Audio’s Stage III product
category known collectively as the Legatia Series.
Legatia L8V2 Attributes
The Legatia L8V2 is a 225mm (8.85-inch) “large format” wide-bandwidth midbass/midrange driver to
compliment both two-way and three-way system designs, where a point-source midrange or
dedicated midbass driver is required. The following are the L8V2’s design attributes:
Basket
The basket of the L8V2 is a shared design with the Stage IV Legatia L8SE for easy upgrade potential;
the L8V2 and L8SE are interchangeable in mounting topology. The L8V2 differs from the first-version
L8 in that the basket geometry has been enhanced in the V2 model to a slightly larger outside
diameter for greater clamping surface area (from 8.5-inch on the L8 to 8.85-inch on the L8V2); the
mounting holes for each driver remain nearly identical however, with a difference of only 2mm
(188mm verses 186mm). Provided enough outside mounting diameter difference can be obtained,
the L8V2 will fit into the first-generation L8’s mounting hole.
The basket is a high-quality cast aluminum design, and contains a 225mm flange providing for the
mounting of the driver via four screw holes (the use of 5mm 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 “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, nonconstant 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 highenergy strontium magnet, with the magnetic circuit fully surrounding the outside of 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.
Note: specifications are subject to change without notice
Copyright © Hybrid Audio Technologies, Inc. All Rights Reserved.
Product Parameters and Specifications
Model: Legatia L8V2 Wide-Bandwidth Midrange/Midbass
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 “largeformat” midrange/midbass.
Phase Plug
The L8V2 comes equipped with a phase plug pole piece extension at the center of the cone; the
phase plug is aluminum and, by design, ensures enhancement of the total inductance profile,
providing much of the inductance reduction benefits noted between the L8V2 and the firstgeneration L8. The phase plug is powder coated black, which by design does not negatively reduce
eddy current, and adds thermal dissipation potential, not to mention sleek, under-stated cosmetics.
The phase plug extends well down inside the pole vent, and acts as a very large and efficient
heatsink for any heat that radiates into the pole.
The highest frequencies of audio emanate from the area around the center of the cone and the lower
frequencies are produced by the area of the cone that is farther from the center. The phase plug
pole piece extension improves the L8V2’s performance and clarity by deflecting delicate midrange
tones forward of the driver, while minimizing distortion and improving bandwidth.
Tinsel Leads
The tinsel leads for the L8V2 are terminated on one side of the voice coil, with a second, unused set
of tinsel leads exiting the opposite side of the termination. Having two sets of tinsel leads reduces
the rocking of the system under high stroke; the spider is mechanically balanced. Additionally the
tinsel leads are bonded directly to the former and brought out to the terminals, which keeps tinsel
lead slap to a minimum and does not compromise the structural integrity of the cone.
Note: specifications are subject to change without notice
Copyright © Hybrid Audio Technologies, Inc. All Rights Reserved.
Product Parameters and Specifications
Model: Legatia L8V2 Wide-Bandwidth Midrange/Midbass
Terminals
The Legatia L8V2 comes equipped with heavy-duty spring loaded brass core terminals that are nickel
plated to optimize contact, and give the end user flexibility in tinned wire or binding post
terminations. The terminals are designed to accept up to 12 gauge wiring.
Summary
The Legatia L8V2 is the ideal multi-purpose super high-end speaker driver. Mechanical and electrical
parameters are amenable to a variety of different installations and speaker locations. This driver is
intended to be used in an infinite baffle configuration; a simple, solid baffle, solidly attached to the
car’s chassis with available airspace at the rear of the baffle is all that is required for optimum
operation. The size of the L8V2 allows it to be mounted in typical “8-inch” midbass locations within
a vehicle, or in custom locations at the discretion of the end-user, as long as there is adequate
airspace behind the driver to allow it to maintain proper damping and acoustic suspension.
At home in virtually any arrangement, the L8V2 is Hybrid Audio Stage III high-end large-format
midrange/midbass offering, boasting exceptional performance and a design philosophy that goes
hand in hand with true high-fidelity playback.
Legatia L8V2 midrange/midbass – three-dimensional design drawing
Note: specifications are subject to change without notice
Copyright © Hybrid Audio Technologies, Inc. All Rights Reserved.
Product Parameters and Specifications
Model: Legatia L8V2 Wide-Bandwidth Midrange/Midbass
Legatia L8V2 midrange/midbass – dimensioned mechanical drawing
Note: specifications are subject to change without notice
Copyright © Hybrid Audio Technologies, Inc. All Rights Reserved.
Product Parameters and Specifications
Model: Legatia L8V2 Wide-Bandwidth Midrange/Midbass
Legatia L8V2 Thiele-Small Parameters
Overall Diameter
φ225 mm (8.85-inch)
Mounting Depth
94 mm
Bolt Circle Diameter
φ211 mm
Mounting Hole
φ186 mm
Recommended Minimum Crossover Frequency
40 Hz at 24 dB/octave highpass
Pnom Rated Power Input (No Crossover)
80 watts (AES Standard)
Pmax Rated Power Input (No Crossover)
160 watts (AES Standard)
Pmax (With Recommended Minimum Crossover)
215 watts
Frequency Range
40 Hz – 3,800 Hz, +/- 3 dB
Sensitivity
88.5 dB at 1 watt/1meter
Mms
30.5 g
Cms
427 um/N
BL
7.85 T*m
Voice Coil Diameter
35.55 mm (1.4-inch)
Impedance
4Ω
DC Resistance
3.4 Ω
Fs
43 Hz (free air)
Qms
2.21
Qes
0.48
Qts
0.394
Xmax
9 mm (one way)
Vas
27.1 L
Sd
0.02 m2
Note: specifications are subject to change without notice
Copyright © Hybrid Audio Technologies, Inc. All Rights Reserved.
Product Parameters and Specifications
Model: Legatia L8V2 Wide-Bandwidth Midrange/Midbass
Legatia™ L8V2 Impedance and SPL Verses Frequency Plot
*note, curve is not corrected*
Black = 0-degrees, on-axis
Red = 30-degrees off-axis
Green = 60-degrees off-axis
Note: specifications are subject to change without notice
Copyright © Hybrid Audio Technologies, Inc. All Rights Reserved.
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