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B38
APPLICATIONS
The ”Fifty-fifty” is one of our best sellers. Designed in 1991, its goal
was to become a universal Bass Driver for high quality sounding
sound reinforcement multi-way systems. So that its qualities are
well balanced between parameters: High SPL / Bass extension /
enclosure compactness / sonic qualities.
This statement comes from the exceptional powerful design of its
3”magnet system in association with a deflection controlled
diaphragm, which allows it to be used over 800 Hz if necessary
against the cost of a slight directivity compromise.
The optimum acoustical load is Bass-Reflex type of 60L to 85L
tuned from 46Hz to 42Hz. Enclosure volumes over 90L are not
recommended.
FEATURES
Power handling capacity 500 W AES
Reference efficiency
(1W @ 1m)
98 dB SPL
SPL max
(continuous)
121dB SPL
Usable frequency range 40-2000 Hz
Environmental withstanding Outdoor
DESIGN CONCEPT
DEFLECTION CONTROLLED DIAPHRAGM optimized for dynamic
damping. DEFLECTION CONTROLLED DIAPHRAGM technology consists
in optimizing the shape and material of the diaphragm so that it
works as a mechanical transmission line, to avoid breaking modes
as well as mechanical threshold which destroy sound quality.
This leading edge technology offers substantial sonic advantages.
Among them: sound coherency, fast transients, stable sound
imaging, high sensitivity, wide frequency range and reduced
directivity pattern.
VENTED COMPACT MAGNET SYSTEM. It has been carefully optimized
to obtain maximum transducing efficiency while avoiding unlinear
behavior such as coil inductance variation with position, flux
modulation, harmonic distortion, rest position offset, air compression
and off-axis voice-coil pushing.
Its design incorporates a T-shaped and vented pole piece, and
a flux stabilization ring. It also takes into consideration
demagnetization at cold temperatures.
IINTERCOOLER SYSTEM (patented). Entirely integrated into the
loudspeaker itself, the INTERCOOLER SYSTEM extracts the heat
produced by Joule effect in the voice-coil by the means of an air
flow directed through the heatsink rims of the basket by the
motion of the dust-cap and the spider.
The gain brought about by this technology is over 20 % of extra
power, so for example, a 3”coil according to this design has
the same power handling capacity as a classical 4”one.
ARCHITECTURAL SPECIFICATIONS
NOMINAL DIAMETER : 380 mm.
FRAME : High tensile alloy pressure
die-cast basket with patented
INTERCOOLER SYSTEM.
MAGNET SYSTEM : 3”highly energized,
heat extracting design with vented
pole piece and flux stabilizing ring.
VOICE COIL : High-temperature
stabilized copper ribbon wound on
high-strength glass polyimide former.
CONE ASSEMBLY : High-strength
cellulose fiber cone and central dome
impregnated and front-coated with
damped resins, fitted with double-roll
treated and damped fabric surround.
SPEAKER MASS : 9.10 kg.
PROFESSIONAL SERIES
8 Ω
15” Bass Midrange Drivers
High Sound Pressure Level
High Sounding Quality
5050
5200
4 Ω