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(Bill of Materials) for a "D4" project might refer to the structured list of components, quantities, and materials needed for a specific assembly in software like Creo Parametric Could you please clarify if you are referring to the Bowers & Wilkins speakers , a specific gaming build technical manufacturing list

represents the pinnacle of Bowers & Wilkins' stand-mount speaker engineering. It is designed to deliver the performance of the flagship 801 D4 but in a form factor suited for smaller rooms or more focused listening environments. Refined Engineering