Delta D21 FS
Flagship Powered 21" Flying Subwoofer
Product at a Glance
The British Acoustics Delta D21 FS is a flagship self-powered 21" flying subwoofer delivering robust, precise low-frequency performance for concerts, live events, and installations. Powered by a 4000W Class-D amplifier, it achieves a peak SPL of 137 dB. Its advanced 21" LF driver features a 4" Quattro in/out copper voice coil and treated waterproof cone for durability and minimal distortion. Equipped with a 4-point fly rigging system, it integrates easily into line arrays. Compatible with Delta Audio Controller and Delta Array Predictor for precise tuning and system configuration, it’s built with marine birchwood and a powder-coated grill for durability. Finished in signature brown, it combines technology, power, and design excellence for professional audio.
CRAFTSMANSHIP
Painstakingly Perfect Production
Over the years, craftsmanship has been closely linked with small scale individualistic production. Back in 1972, we started the same way. As we grew in scale & size, it was difficult to build each speaker individually, but quality control was of utmost importance as so switching to a general assembly line was simply not an option. So we wrote up a code, one quite like enigma, to ensure quality control. We selected the right partners, got the right tools, and in cases where those weren't available, we invented them. We grew slower than most as our aim was to last longer than most.
TECHNICAL SPECIFICATIONS
ACOUSTICAL SPECIFICATIONS
• Freq. Response (-3 dB) : 30 Hz - 125 Hz
• Freq. Range (-10 dB) : 25 Hz - 125 Hz
• Omnidirectional Coverage
• Cardiod preset available
• Crossover : 60 Hz -100 Hz active
• Max Output : Cont. - 131dB, Peak -
137dB
SYSTEM SPECIFICATIONS
• Recommended System Control : Delta Audio
Controller (DAC) & Delta Array Predictor
(DAP)
LF TRANSDUCER
• 212K - 21” Low Frequency Drivers
• 1600W AES Power, 6400W Peak
• 4” Duo Copper Voice Coil - Neodymium
Magnet
• Malt Cross Cooling Technology
• FEA optimized neodymium magnet circuit
• Fortex™ Weather Resistant Cones
HOUSING
• Marine Birchply Enclosure
• Granular Scratch Free Polyurea Paint
• Perforated Black, Pressed Steel Grills
• Integrated Handles on Either Side
• 4-Point Easy-Fly™ Rigging Mechanism
• Tethered Quick-lock Pins
• Max. of 16 units in one hang with the Acc D2 Max
• Can be flown or stacked with the Delta D2 LA
AMPLIFIER & DSP
SPECIFICATIONS
• 3000W Class-D Amplifier
• Dual Stage Power Factor Correction
• Exceptional Amplifier Efficiency
• Thermal, short-circuit and overload
protections
• 64 bit/96KHz processor, Digital FIR filters
• 32 bit/96KHZ AD/DA converters
• 3” LCD Touch user interface
• Dual Ethercon Connectors to connect with
Delta Audio Controller
• AES/EBU XLR In/Out, Analog XLR In/Out
• 16A Neutrik Truecon Power In/Out
OPERATING PARAMETERS
• Operating positions : On Ground, stackable
or flown with correct accessories
• Maximum permitted ambient temperature
(Ta max) 55° C (124° F)
• Minimum permitted ambient temperature
(Ta min): -2° C (28.4° F)
AESTHETIC SPECIFICATIONS
• British Acoustics Signature Umber Brown
Tone
• Non Reflective, Matte Black Grills
• Available in a RAL code of your choice (24
nos, minimum)
IP SPECIFICATIONS
• IP 43 - Standard protection against dust &
splashes
OPTIONAL ACCESSORIES
• See system chart for the System Accessories
SIZE
• Product : 609 x 800 x 777 mm (H x W x D)
• Product : 24 x 31.5 x 30.6 inch (H x W x D)
• Packed individually
WEIGHT
• Net : 64 Kgs
• Net : 141.1 Lbs
SHIPPING INFORMATION
• Carton Size
684 x 875 x 852 mm (H x W x D)
26.98 x 34.4 x 33.5 inch (H x W x D)
• Gross Weight : 67.2 Kgs / 148.24 Lbs
• Packed : Individually
DOWNLOADS CENTRE
Datasheet Delta D21 FS
Software
Software
