Sonance SGS SUB Garden Series 10" Passive In-Ground Subwoofer (Each) Dark Brown 93435 - Best Buy
Klipsch PRO-12SW-LS outdoor subwoofer
Coastal Source Bi-amped 2.1 Outdoor System SAS300/4-SPR-C2 amp/enclosure with Sonos Port, two 10.0 2-Way Ellipse Bollard speakers, and 14.0 Bollard subwoofer at Crutchfield