Bose 601 Series III speakers (1986-1994) found in a thrift store. They are very sought after and are worth $1k to $1.5k online! They sound great. : r/ThriftStoreHauls
Bose® 601™ Series IV (Black) Floor-standing speakers at Crutchfield
Vintage Bose 601 Series III Direct/Reflecting 2-Way Tower Stereo Speakers | Reverb