B-Line 21″
The Powerhouse
The mighty 21″ driver with its huge 5″ voice coil thunders with up to 142 dB max. SPL down to the deepest depths – performing from 25 Hz it is the bass beast in our line-up.
With a load capacity of up to 4,000 W peak, it delivers enough power for every stage and every event. Despite its higher weight, it is easy to manoeuvre thanks to the two wellpositioned recessed grips on both sides.
In direct comparison, as expected, it delivers the most robust performance at the low end and generates more than enough pressure in any situation.
The active versions of this bass monster have a 1,600 W Class-D amp on board.
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Features
The great advantage of powered speakers is the built in amplifier. So there is no need for an external device – the internal amp is optimally matched to the woofer! The B 21A is driven by a mighty 1,600 W
(peak) Class-D amplifier. Integrated DSP presets allow loading of preset system setups that are optimally matched to SE Audiotechnik products.
Thus, the entire system is quickly and easily set up and perfectly adjusted. The directivity can be effortlessly changed in a flash from normal to cardioid or end-fire configuration via the large display and the push/rotary controller.
Parameters such as EQ, Delay, Sensitivity and Phase can be adjusted and stored in your own User Presets.


Products of the 21'' - Series
Specifications

Model: | B 21 | B21A |
---|---|---|
ACOUSTICAL | ||
Frequency range (-3dB) *: | 33 Hz – 130 Hz | 33 Hz – 230 Hz |
Frequency range (-6dB) *: | 26 Hz – 160 Hz | 27 Hz – 280 Hz |
Coverage angles (-6dB) [H x V]: | Omnidirectional | Omnidirectional |
Nominal impedance: | 8 Ω | 8 Ω |
Sensitivity **: | 99 dB | |
Peak power: | 4000 W | 1600 W |
Continuous power ***: | 1000 W | |
Maximum Peak SPL ****: | 142 dB | 139 dB |
System type: | 1-way passive system | 1-way self-powered system |
Transducers: | 1 x 21″ driver | 1 x 21″ driver |
Enclosure type: | Vented box | Vented box |
Connectors: | Input / Link signal: 4 Neutrik speakON® NL4 Link output: 1 Neutrik speakON® NL4 | Input signal: balanced XLR 3-pin female Link output: balanced XLR 3-pin male Power input: powerCON® 20A Power link output: powerCON® 20A |
Wiring: | Pins 1+/1- : driver Pins 2+/2- : link (Output CH 2, pins 1+/1-) | Pin N: Neutral Pin L: Conductor Pin E: Ground |
MECHANICAL | ||
Product dimensions [H x W x D] (Including rigging): | 666 x 585 x 832 mm | 666 x 585 x 832 mm |
Net weight: | 51 kg | 55 kg |
Packaging dimensions [H x W x D]: | 796 x 685 x 930 mm | 796 x 685 x 930 mm |
Total weight: | 61.5 kg | 65 kg |
Cabinet: | 15 – 24 mm plywood | 15 – 24 mm plywood |
Cabinet finishing: | Black or white polyurea coating | Black or white polyurea coating |
Grille: | Powder coated perforated steel | Powder coated perforated steel |
Hardware | 4 SE Audiotechnik® ergonomic handles 8 rubber feet and top recesses for stacking M20 pole thread | 4 SE Audiotechnik® ergonomic handles 8 rubber feet and top recesses for stacking M20 pole thread |
Stacking: | Two-point SE Audiotechnik® stacking system | Two-point SE Audiotechnik® stacking system |
ACCESSORIES | ||
Pole bar: | SPS20 | SPS20 |
Transport dolly: | B21 TD | B21 TD |
Transport cover: | B21 TC | B21 TC |
Amplifier rain cover: | P801DL RC | |
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 |
Accessories

SPS 20
M20 Pole Support to pole mount an M-F3A or M-F3A PRO on any B-Line subwoofer

B21 TD
Dolly board for B 21 subwoofer