d&b audiotechnik 21S-SUB

The 21S-SUB is a high performance subwoofer for use with the xS-Series and xA-Series loudspeakers and is intended for a wide range of permanently installed applications. The cabinet houses a single long excursion 21" driver in a bass-reflex design. The large, specially shaped reflex port enables the 21S-SUB to achieve high Sound Pressure Levels from a cabinet with a small footprint.
When operated in INFRA mode, the 21S-SUB can be used to complement other d&b subwoofers by extending the frequency response of the system down to 33Hz. The 21S-SUB can be ground stacked or flown in either orientation. It can be flown individually or in a cluster of two cabinets.
The enclosure is constructed from marine plywood with an impact resistant black paint finish. The front of the loudspeaker cabinet is protected by a rigid metal grill backed by an acoustically transparent foam. The top, bottom and rear panels each incorporate a pair of M10 threaded inserts for attaching d&b rigging hardw...are. The Weather Resistant option enables the operation of loudspeakers in changing ambient conditions, and features a fixed cable. The 21S-SUB can also be supplied in any RAL colour. This Special Colour option can be provided for rigging accessories.
Data
System data  
Frequency response (–5 dB standard)
35 - 105 Hz
Frequency response (–5 dB INFRA mode)
33 - 85 Hz
Max. sound pressure (1m, free field)1 with D20/30D with D80
134 dB 135 dB
Cabinets per amplifier channel
1
Loudspeaker data  
Configuration
Installation specific high performance subwoofer with compact footprint
Nominal impedance
4 Ω
Power handling capacity (RMS/peak 10 ms)
650/2600 W
Components
21" driver with neodymium magnet
Connections
1 x NL4 1 x screw terminal block
Dimensions, weight  
Dimensions (H x W x D)
1100 x 580 x 526 mm
Weight
54 kg
1 SPL max peak test signal: pink noise with crest factor 4
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.

VIAC