Q Acoustics Concept 40 Floorstanding Speakers (Pair) (Gloss Black) The Concept 40 is Q Acoustics' flagship floor-standing speaker delivers an unparalleled sonic performance. The Concept 40's extraordinary soundstage, dynamics and sheer musicality is achieved by incorporating its bespoke drive units into a 'GelcoreTM Construction' cabinet which allows the drive units to perform at their very impressive best. Enclosure Type: 2-Way Reflex with Double Woofer, Bass Unit: 2 x 125mm, Treble Unit: 25mm Frequency Response (+/- 3 dB): 53Hz - 22kHz, Nominal Impedance: 8ohm, Minimum Impedance: 4ohm Sensitivity: 90dB, Crossover Frequency: 2.3kHz Includes: (2) Concept 40 Floorstanding Speakers (Gloss Black), (2) Speaker Grills, (2) Glass Floor Outrigger Stands, (8) Outrigger Stand Screws, (4) Floor Spikes, (4) Floor Spike Locking Nuts, (8) Rubber Spike Protectors, (4) Bi-wire Linking Plates, Dimensions H/D/W (Inches): 38.26 x 6.69 x 11.33 GelcoreTM Construction - cabinet which allows the drive units to perform at their very impressive  best. Enclosure Type: 2-Way Reflex with Double Woofer, Bass Unit: 2 x  125mm, Treble Unit: 25mm, Frequency Response (+/- 3 dB): 53Hz - 22kHz,  Nominal Impedance: 8ohm, Minimum Impedance: 4ohm, Sensitivity: 90dB,  Crossover Frequency: 2.3kHz