Bose 251 Environmental Outdoor Speakers (Black) (24643) Take these speakers with you anywhere you want to have great sound quality Set them up by the pool, or on the workbench, or anywhere an extra-durable speaker is needed A water-resistant composite casing makes these tough enough to handle blistering heat or deadly cold The articulated array speaker design makes for clearer sound in areas like workshops or basements.For extra powerful sound, it has a multi-chamber bass enclosure Weight of each speaker:8 lbs. Check the balance control on your receiver or amplifier and make sure its centered