Alpha Sub 428 S Aqua
Twin 18" Passive Subwoofer
Product at a Glance
The British Acoustics Alpha Sub 428 S Aqua is a premium twin 18-inch passive subwoofer engineered for powerful and reliable low-frequency performance. Designed for professional audio applications, this subwoofer features dual 18-inch long-excursion drivers with robust 4-inch copper voice coils, delivering an impressive 2400W AES power handling and peak output of 9600W. Its omni-directional coverage and cardioid presets make it ideal for live events, concerts, and demanding installations.
Built to endure harsh environments, the Alpha Sub 428 S Aqua boasts a marine-grade birch plywood enclosure coated with granular scratch-resistant polyurea paint. Its perforated black steel grills add durability while maintaining a refined aesthetic. With an IP65 Aqua rating, the subwoofer provides superior protection against dust and water, ensuring reliable operation in outdoor or semi-outdoor settings. Features such as integrated handles, M10 flying inserts, and compatibility with various installation accessories offer unmatched versatility for any setup. The Alpha Sub 428 S Aqua is the perfect choice for audio professionals who demand powerful bass and exceptional build quality.
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) :32 Hz - 190 Hz
• Freq. Range (-10 dB) : 37 Hz - 200 kHz
• Rated Power : 2400W AES, 9600W Peak
• Omni-Directional Coverage
• Cardioid presets available
• Nominal Impedance : 4 Ω
• Crossover : 80 - 120 Hz Active
• Max Output: Cont 136 dB, Peak 142 dB
• 2 x Speak-On Sockets, Input & Thru
SYSTEM SPECIFICATIONS
• Recommended System Control : Delta Drive
DSP Control Systems
• Recommended Amplifiers : See Amplifier
load calculation chart
LF TRANSDUCER
• 18" Low Frequency Long Excursion Driver
• 1200W AES, 4800W Peak
• 2 Drivers connected in parallel
• 4" Copper Voice Coil - Ferrite Magnet
• 3L Resistance Coating
• Minimal Power Compression with optimised
air-paths
• Aluminum Demodulation Ring for reduced
distortion
HOUSING
• Marine Birchply Enclosure
• Granular Scratch Free Polyurea Paint
• Perforated Black, Pressed Steel Grills
• Integrated Handles on Either Side
• Includes a set of round bottom feet for
secure and stable stacking
• Sloped Input Plates
• M10 Flying inserts
• Installation brackets : Alpha Throne (H),
Alpha Throne (V), Alpha Yoke B410
AESTHETIC SPECIFICATIONS
• British Acoustics Signature Umber Brown
Tone
• Blue Decals on Grills for better Aesthetics
• Available in a RAL code of your choice (24
nos, minimum)
OPERATING PARAMETERS
• Operating positions: Can be used
horizontally or vertically and can be used as
a stack of subs
• Maximum permitted ambient temperature
(Ta max) 55° C (124° F)
• Minimum permitted ambient temperature
(Ta min): -20° C (-4° F)
IP SPECIFICATIONS
• Aqua Version : IP 65 - Offers greater
resistance against dust, water & corrosion
OPTIONAL ACCESSORIES
• See system chart for the System Accessories
SIZE
• Product: 508 x 1198 x 762 mm (H x W x D)
• Product: 20x 47.2x 30 inch (H x W x D)
• Packed individually
WEIGHT
• Net : 82 Kgs
• Net : 180 Lbs
SHIPPING INFORMATION
• Carton Size
583 x 1273 x 837 mm (H x W x D)
23 x 50 x 33 inch (H x W x D)
• Gross Weight : 86.1 Kgs / 189.8 Lbs
• Packed : Individually
DOWNLOADS CENTRE
