The Vivid Audio Moya M1 C225 bass drivers uses a radially polarised magnet structure, in this case twelve 45mm-long segments of high energy rare-earth magnet in an 11kg lump of high-purity steel. Wound on a virtually indestructible glass- reinforced former, capable of handling over 300°C, the edge-wound copper-ribbon voice coil can take extreme power in its stride.
Each pair of drivers is arranged in a horizontally-opposed configuration on either side of the bass module, with magnets united by a substantial steel tie-bar to completely eliminate reaction forces and the need for a heavy enclosure.
A foam-cored composite sandwich is used throughout the cabinet, which features extensive composite bracing to ensure a resolutely stiff enclosure with all structural modes safely out of band.
Ultimate low-end is provided by a pair of reaction-cancelling ports, which, by virtue of the exceptionally low crossover frequency of the bass section, can be generously proportioned, thereby minimising any turbulent effects which might limit low-end linearity.
As with the entire Vivid Audio range, the Moya M1 uses exponential absorbers. In the bass systems this is achieved by terminating the tapered chamber with an arrangement of nested concentric shells, accurately defining the exponential taper and safely dissipating any unwanted resonances.