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.

B 21 B 21A

Interested in the product?

Then make an appointment now.

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

B 21

B 21A

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}