Definitive Technology UIW RLS III In-Wall Reference Line Source Speaker Open Box (Each)Two 5-1/4 inch cast basket drivers and 5-1/4 inch pressure-coupled Low Bass radiators for impressive deep bass with high impact punchIntegrated wood enclosure ensures consistent high performance every timeOne 1 inch Pure aluminum dome tweeterInstalls in either new or existing construction applicationsAvailable individuallyThe Reference Line Source III (RLS III) is an enclosed full range loudspeaker engineered for flush mount in-wall installation. It features