C.D.L.
1815 LOW-PACKS
The
C.D.L. 1815 Low-Pack is the Butterfly system’s low frequency
element. To all effects, it’s an enclosure built with the criteria
necessary for forming a real low frequency Vertical Line Array.
It
weighs just 45.8 kg. and its dimensions are the same as two C.D.H.
483 Hi-Packs one above the other. Being fitted with the same flying
hardware, it’s therefore completely compatible and able to be
perfectly combined with the latter.
CARDIOID
OR HYPERCARDIOID DISPERSION
The
C.D.L. 1815 Low-Pack is equipped with a 18” woofer for front
emission and a 15” woofer inside the box, used to recreate the
system’s Cardioid or Hypercardioid dispersion.
The two
loudspeakers are powered by separate amplifiers. The diagram,
related to the most useful cardioid configuration, shows the uniform
reduction of rear emission for all frequency bands involved and the
remarkable “front-to-back” ratio which, from a minimum of 12dB
at 120Hz (the suggested upper cut-off frequency) gives an attenuation
of over 15dB on
rear emission
for all the other
frequency bands (100, 80, 63, 50, 40 Hz).
Applications have been
made for Italian and international (PCT) patents for the C.D.L. 1815
Low-Pack too, supported by frequency response polar plots and a
circuit diagram to make its original operating principle more easily
understood. (*)
(*)
Source: Butterfly System
White Paper by Guido Noselli
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