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The SSP6 Multiducer is a new class of product for transforming rigid surfaces – walls, ceilings, tables, windows, vehicles, and other surfaces – into full range audio speakers. It employs a different subset of acoustical physics – bending wave physics – giving you a true Distributed Mode Loudspeaker (DML) with no hot spots or off-axis high frequency dropoffs.

https://www.revolutionacoustics.com/products/ssp6-multiducers