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Alpha Sub 428 S WR

Twin 18" Passive Subwoofer

Product at a Glance

The British Acoustics Alpha Sub 428 S WR is a twin 18-inch passive subwoofer engineered for delivering powerful and precise low-frequency audio. It features dual 18-inch long-excursion drivers with 4-inch copper voice coils, offering 1200W AES power and a peak of 4800W. Its omni-directional coverage ensures even sound dispersion, while cardioid presets provide flexibility for advanced setups, making it perfect for live events, installations, and demanding applications.

Crafted with a robust birch wood enclosure and coated with scratch-resistant polyurea paint, the Alpha Sub 428 S WR offers exceptional durability. The perforated stainless steel grills backed by acoustically transparent foam enhance protection without compromising performance. Rated at IP54 for resistance to dust and water, this subwoofer is designed to withstand tough environments. Additional features include sloped input plates for optimized cable management and integrated M10 flying inserts for versatile rigging. Accessories like castor wheels and pole mounts add to its adaptability, making it a reliable choice for professional audio systems.

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, 9600W Peak
• Senstivity : 103 dB
• H Dispersion : Omni-directional
• V Dispersion : Omni-directional
• Nominal Impedance : 4 Ohms
• Maximum SPL :Cont: 137" Peak : 143"
• Terminal 1 : 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
• M10 Flying Inserts
• Integrated Handles - M-10 insertion points

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 deployed
horizontally or vertically with the corrrect
installation brackets or can be used as a
monitor
• Maximum permitted ambient temperature
(Ta max) 55° C (124° F)\
• Minimum permitted ambient temperature
(Ta min): -20° C (-4° F)