24C column loudspeaker

The 24C 2-way passive column loudspeaker features six 4” neodymium drivers and a HF array comprising six 1.1” dome tweeters providing a nominal horizontal dispersion of 90°. The HF array has a nominal vertical dispersion of 20°, which can be adjusted constantly between 0° and -14° to target audience listening areas. The beam produced by the low / mid drivers is tilted downwards by 5°, offering significant directivity down to 370 Hz. 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 a broadband attenuation to the rear of approximately 18 dB. A cardioid dispersion pattern produces minimal energy behind the loudspeaker, reducing reflections and resulting in balanced level distribution across the listening area while increasing gain before feedback when working with open microphones. The 24C loudspeaker enclosure is constructed from an extruded aluminium back and a metal baffle, while the front and sides of the cabinet are protected by a metal grill. The rear of the cabinet features continuous T-slot rails for mounting purposes and a 4-pole Phoenix combicon terminal connector. The xC-Series loudspeakers are available in white or black as standard, or can be provided with the Special Colour (SC) option that can be executed in all RAL colours.

The 24C can be combined with the 24C-E passive extension increasing vertical pattern control down to 190 Hz.

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Cardioid dispersion

Cardioid dispersion

Conventional column loudspeakers provide no significant horizontal directivity below 2 kHz due to their physical size. At low and mid frequencies, the resulting polar pattern is almost omni-directional as shown by the dotted line in the Free field horizontal polar plot illustration. The continuous line shows the cardioid pattern of the 24C with reduced radiation to the rear of the loudspeaker.

 

Typically, column loudspeakers are mounted onto walls or other hard plane surfaces which act as an acoustic mirror, as shown in the Wall mounted horizontal polar plot illustration. This results in the room not only being covered by the sound of the actual column loudspeaker, but also by the sound produced by its virtual mirror source from behind. In the case of conventional column loudspeakers, the mirror source radiates at a similar level as the loudspeaker itself. The combination of both sources results in a dipolar characteristic where the main energy is radiated along the walls as indicated by the dotted line. With their cardioid dispersion patterns, when similarly wall mounted, the 24C provides an even dispersion characteristic and useful directivity, as shown by the continuous line in the Wall mounted horizontal polar plot.

Accessories

Accessories

Amplifiers

Amplifiers


The d&b audiotechnik loudspeaker range is designed exclusively for operation with d&b amplifiers. These provide power as well as comprehensive control and protection functions tailored to achieve the performance, reliability and longevity associated with the d&b System approach. The d&b 10D, 30D and D6 amplifiers are recommended to drive the 24C. The d&b D20 and D80 amplifiers can also be used with the appropriate loudspeaker configuration selected.

Data

Data

System data  
Frequency response (–5 dB standard) 110 Hz - 17 kHz
Frequency response (–5 dB CUT mode) 150 Hz - 17 kHz
Max. sound pressure (1m, free field)1 126 dB SPL
Cabinets per amplifier channel 2
Loudspeaker data  
Configuration Installation specific cardioid column loudspeaker
Power handling capacity (RMS/peak 10 ms) 125/600 W
Nominal dispersion angle (h x v) 90° x 20°
Vertical downtilt of low-mid beam
Vertical adjustment of HF section 0° ‒ -14°
Components 6 x 4" driver with neodymium magnet
6 x 1.1" dome tweeter mounted in vertical horn array
Passive crossover network
Connections 4-pole Phoenix terminal
NL4
Dimensions, weight  
Dimensions (H x W x D) 1000 x 124.5 x 124 mm
39.4 x 4.9 x 4.88"
Weight 9 kg
19.8 lb

Application information is presented for guidance only. d&b reserves the right to make any necessary changes to the products and the published specifications. As part of the ongoing development program d&b tries to maintain the highest degree of product compatibility.

Documentation

Documentation

Title Language Date Size
24C/24C-E Manual 1.4 English 04.11.2016 1 MB
EU Declaration of Conformity (CE) International 04.10.2016 51 KB
The xC-Series brochure English 22.02.2017 3 MB

Architectural specifications

Architectural specifications

The 2-way passive column loudspeaker shall consist of six 4” neodymium drivers and an HF array comprising six 1.1” dome tweeters.
In the vertical plane, the beam produced by the low-mid drivers shall be tilted downwards by –5° and shall provide directivity pattern control down to 370 Hz.
The loudspeaker shall be extendable by a dedicated extender unit to allow the vertical dispersion control to be extended downwards by another octave to 190 Hz.
The HF array shall have a nominal vertical dispersion of 20° and its main axis shall be adjustable continuously between 0° and –14°.
The 4” drivers shall be arranged in a unique cardioid setup radiating through waveguide elements at the front and damped ports at the rear of the cabinet and shall provide a constant directivity pattern of 90° in the horizontal plane with a broadbad attenuation to the rear of the column of, on average, approx. 18 dB.

The loudspeaker cabinet shall be based on an extruded aluminum profile with a metal grill protecting the front of the loudspeaker.
Two continuous rails (8 mm T-slot profiles) shall be provided at the rear for attaching a wall mount bracket.

The connection panel on the back shall be recessed and fitted with a 4-pole Phoenix terminal and shall allow a cross-section of up to 4 qmm / AWG 11.

The power handling capacity shall be 125 W RMS and 600 W peak (10 ms).
The frequency response (–5 dB) measured on axis shall be 110 Hz to 17 kHz with a maximum sound pressure of at least 126 dB.

The dimensions (WxHxD) shall not exceed 125 x 1000 x 124 mm (4.9" x 39.4" x 4.9") and the loudspeaker shall weigh no more than 9 kg (19.8 lb).

The loudspeaker shall be the 24C by d&b audiotechnik GmbH.