The Proficient Protege outdoor landscape series is a high performance speaker system that over delivers on value and price. Each Protege outdoor speaker system comes with either an 8" burial subwoofer or an all new above ground hardscape subwoofer and comes matched with four 4".Protege Satellite speakers for an exceptional sound experience. Unlike high performance landscape systems that require expensive high-power amplifiers, the Protege Landscape Series is designed to be used with lower powered distributed audio amplifiers or extended audio zones (like Zone 2) from conventional AVRs. When using 4 ohm stable amplifier or AVR, each 4.1 system can be expanded up to an 8.2 system.