A review of the BASSBOSS ZV28 MK3 double-18" subwoofer paired with the AT212 MK3 top. Hear the system, get real impressions of the ZV28's low end, and see how this pairing performs as a compact high-output rig. Fullblast Sound is a family-owned authorized BASSBOSS dealer in San Antonio, TX, nationwide install, freight, and system design.