C.D.H. 483
HI-PACKS
The C.D.H. 483 Hi-Pack
is the Butterfly system’s element for mid-low, mid and high
frequency reproduction. Weighing just 35 kg. the cabinet has an
unmistakable shape (the only one among current line array systems
covered by an international patent) which brings to mind the
butterfly from which it takes its name, thanks to the triangular
opening in the upper and lower “sides”.
This original design
solution favours the optimum coupling of array elements up to the
highest frequencies, keeping the distance between the sources as
short as possible and at the same time providing them with a
continuous loading ‘baffle’.
Unlike other units, Butterfly’s shape doesn’t contrast with the
cabinet’s technical operation, so doesn’t accentuate any
diffraction or alteration of mid/high response.
HF
SECTION
The
high frequency section of the Butterfly system is equipped with a
3” (1.41” throat) compression driver coupled with a D.P.R.W.G. (Double
Parabolic Reflective Wave Guide) device, another Outline invention
for which an international patent has been applied for.
The result
of three years of research and tests, the D.P.R.W.G. is a really
original device and is geometrically based entirely on precise
mathematic calculations.
It has the job of taking a circular
planar
(flat) wavefront emitted by the source at its input (e.g. that of a
compression driver) and transforming it into a rectangular planar
wavefront at its output, keeping signal paths identical from every
emission point of the source.
The rectangular planar wavefront thus
obtained can be loaded by an appropriate horn or waveguide to ensure
the necessary coverage. (*)
D.P.R.W.G.
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MID-BASS
AND MID SECTION
The
C.D.H. 483 is a three-section element/enclosure designed for
biamping. As well as a 3” compression driver, it’s equipped with
four high-efficiency 8” mid woofers: two band-pass
loaded (110-400Hz)
and two reflex high-pass (110-1250Hz) loaded by the sides of a
waveguide with a 90° dispersion
angle.
These two sections are connected in parallel without
any type of passive crossover, so can both be powered using one
amplifier. By means of the appropriate upper mechanical
filter
of the first band-pass section, obtained with the precise
restricting design of the
resonance chambers and the respective tuning, emission phase has
been shifted, enabling the energy in the portion of band
reproduced by both sections together to be doubled.
This peculiarity,
at present an exclusive feature, enables to make up for the lack of
power in the mid/low frequencies typical of other line array
elements whose compact dimensions are comparable to those of
Butterfly C.D.H. 483 High-Packs.
(*)
Source: Butterfly System
White Paper by Guido Noselli
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