The B 21 comprises a single 21″ driver mounted in a vented box, with a sophisticated adaptive port that optimises the airflow and improves its response. This technology, developed through exhaustive research, enables a lower cut-off frequency while having smaller volume. This translates into deeper and dynamic bass from a compact enclosure.
In addition to the speakON® connectors on the back, the subwoofer includes two additional located on the front. This guarantees wiring flexibility and ease of use, reducing setup time even in large configurations.
Finally, the set of accessories specially designed for the B-Line, makes their setup and transportation easier, safer and more comfortable.
Sockets at front grill
Convenient multiple Neutrik speakON® sockets in front* and back allows for easy set up ideal for live performances.
Cardioid subwoofer setups
Due to the intelligent stacking design and the front* and rear sockets, it is possible to operate our B-Line subwoofers as a cardioid setup without any problems.
* B 15A and B 15A W do not have any front sockets.
Our so called “starfish rubber-feet” are made from some flexible rubber/plastic material, which provides good slip resistance.
|Frequency range (-3 dB) *:||33 Hz - 130 Hz|
|Frequency range (-10 dB)*:||26 Hz - 160 Hz|
|Coverage angles (-6dB) [H x V]:||Omnidirectional|
|Nominal impedance||8 Ω|
|Peak power:||4000 W|
|Continuous power ***:||1000 W|
|Maximum Peak SPL ****:||142 dB|
|System type:||1-way passive system|
|Transducers:||1 x 21" driver|
|Connectors:|| Input / Link signal: 4 x Neutrik speakON® NL4 |
Link output: 1 x Neutrik SpeakON® NL4
|Wiring:|| Pins 1+/1- : driver |
Pins 2+/2- : link (Output CH 2, pins 1+/1-)
|Product Dimensions [H x W x D] (Including Rigging):||666 x 585 x 832 mm|
|Net weight:||51 kg|
|Packaging dimensions [H x W x D]:||796 x 685 x 930 mm|
|Total weight:||61.5 kg|
|Cabinet:||15 - 24 mm plywood|
|Cabinet finishing:||Black or white polyurea coating|
|Grille:||Powder coated perforated steel|
|Hardware:|| 4 SE Audiotechnik® ergonomic handles |
8 rubber feet and top recesses
M20 pole thread
|Flight case:||B21 FC|
|Transport dolly:||B21 TD|
|Transport cover:||B21 TC|
|All product specifications are subject to change without prior notice.|| * Measured with a 6th-order Butterworth low-pass filter applied at 130 Hz |
** Half space, 1W / 1m, on axis
*** According to EIA-426B Standard (based on RMS Voltage)
**** Max Peak SPL = Sensitivity + 10log10(Continuous Power) + 12 dB Crest Factor
M20 Pole Support to pole mount an M-F3A or M-F3A PRO on any B-Line subwoofer
Flight case for B 21 subwoofer
Dolly board for B 21 subwoofer
Transport cover for B 21 subwoofer