d&b 24C - Manual (Page 5)

2.1. Product description
2.1.1. 24C cardioid column loudspeaker
The 24C is a passive 2-way column loudspeaker housing six 4”
neodymium drivers and an HF array comprising six 1.1” dome
tweeters.
The 4" drivers are arranged in a unique cardioid setup radiating
through waveguide elements at the front and damped ports at the
rear of the cabinet. This design provides a constant directivity
pattern of 90° in the horizontal plane with an average broadbad
attenuation to the rear of approx. 18 dB.
In the vertical plane, the beam produced by the low-mid drivers is
tilted downwards by –5° and provides significant directivity down
to 370 Hz.
The HF array has a nominal vertical dispersion of 20° and its main
axis can be adjusted continuously between 0° and –14° (when
using ArrayCalc, adjustment in 1° increments).
The loudspeaker cabinets are based on an extruded aluminum
profile with a metal grill protecting the front of the loudspeaker.
Two continuous rails (8 mm T-slot profiles) are provided at the rear
for attaching a wall mount bracket.
2.1.2. 24C-E cardioid column extender
The 24C-E is a passive column extension to be attached directly to
the 24C. The cabinet houses six 4” neodymium drivers, providing
an extension of vertical directivity down by a further octave to
190 Hz.
The acoustic design is based on the same principles as the 24C,
thus offering the same cardioid dispersion pattern in the horizontal
plane. The extender is electrically connected through the 24C
without the need for an additional amplifier channel.
Note: The 24C-E loudspeaker is not intended to be operated
as a stand-alone system.
2. 24C / 24C-E cardioid column loudspeaker
d&b 24C/24C-E Manual 1.3 en 5