Alpha Source 428 WR
2 x 8" Wide Application High Performance Passive Speaker
Product at a Glance
The British Acoustics Alpha Source 428 WR is a powerhouse in subwoofer performance, delivering robust and immersive low-frequency audio for demanding professional applications. Featuring twin 18-inch low-frequency long excursion drivers with a 4-inch copper voice coil, this subwoofer is built to provide deep, powerful bass with precision and clarity. As part of the WR Series, the Alpha Source 428 WR is IP54-rated, ensuring superior resistance against dust and water, making it an excellent choice for both indoor and outdoor setups.
The subwoofer's marine birch plywood enclosure is enhanced with a granular scratch-free polyurea paint finish, ensuring exceptional durability and a refined aesthetic. Perforated black steel grills offer additional protection while complementing its professional design. With multiple deployment options, including M10 flying inserts and compatibility with various mounting accessories, the Alpha Source 428 WR combines performance with flexibility. Ideal for large-scale events, live performances, and permanent installations, this subwoofer represents the pinnacle of British Acoustics engineering.
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
HF TRANSDUCER
• A3004 - 1.7" Exit HF Compression Driver
• 75W AES, 300W Peak
• 2.5" Voice Coil - Ferrite Magnet
• Alpha Contour Waveguide ensuring
consistent coverage
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
• WR Version : IP 54 - Offers greater
resistance against dust & water
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
Datasheet
CAD Files
GLL
