One centre channel and four front/surround speakers. Front and surround speakers: Single 3-1/2-inch polymer composite cone woofer; single 1/2-inch silk/polymer composite dome Surround and front speaker dimensions: 6-1/2 x 4-1/16 x 5 inches (HxWxD) Center speaker: Dual 3-1/2-inch polymer composite cone woofer; single 3/4-inch silk/polymer composite dome Center speaker dimensions: 4-5/16 x 11-3/16 x 5-13/16 inches (HxWxD)