Insignia NS-B2111 6.5" Bookshelf Speakers Frequency response: 50hz-20khz Impedance: 8 ohms, Max power handling: 120 watts Tweeter Size: 1", Tweeter Composition: Silk dome Subwoofer: 6-1/2", Subwoofer Driver: Carbon fiber Number of Speakers: 2, Speaker type: Bass-reflex