While Bose are best known for the high-end gear and ultimate quality applications it has been designed for, they are still into producing “greater sound” - meaning that they're not at all shy to offer powerful loudspeakers whose intended use is larger venues and bigger spaces such as big clubs, places of worship or theaters.
Now, having sound is not enough, you need good and coherent sounding gear if you want to make yourself heard well. While Bose has previously come up with 2 full range speakers, it was high time they released a bass enclosure.
The Modular Bass speaker, also known as Bose MB4 is the thing you need as a complement for your 802 or 402 series: it handles 200W continuous power and will throw lows between 40Hz and 300Hz while being able to act as a single bass unit or in multiple combinations forming an array.
The wood micro-fiber composite enclosure ensures precise and definite LF while the polypropylene caps provide both the rugged features needed for heavy duty usage and the carrying handles which make the MB4 very comfortable when carried.
The MB4 is loaded with 4 vertically paired 5.2” (13.3 cm diameter) woofers with the nominal impedance of 8 Ohms; they are all wired in such a way that the combined impedance remains 8 Ohms and thus being able to be driven by most amplifiers on the market.
As Bose states in the official specs, all sound below 200Hz is omnidirectional and this way the MB4 can fill in the desired space while not constraining the users to build up a special bass-array that could possibly interfere with the rest of the plans. Fairly lightweight (about 20kg), the Bose MB4 sells for approximately 670 USD but it's most likely prices go even lower. Usual NL4 connectors and a 5-year transferable limited warranty complete the whole package.