The physical construction which encloses and supports the loudspeaker drive units. Usually built of wood or wood-composites (although other materials are often used including metal alloys and mineral composites).
Cabinets can be ‘sealed’ (often referred to, misleadingly, as an 'infinite baffle') or ‘vented’ in various ways (ported, bass-reflex, ATL, transmission line), the precise design influencing the bass and time-domain characteristics.