Tri-Art Open 3 Speakers blend artisan bamboo craftsmanship with acoustic excellence for an unmatched auditory experience. Specs: Rated Impedance: 8ΩSensitivity: 94dB (1W/1m)Frequency Range: 45 – 40,000 Hz (+/- 3dB)Adjustable Volume Control for Full Range Speaker SectionIncludes Bamboo Stand with 4 Brass-Collared, Bronze Spikes and Spike CupsRecommended Amplifier Rating (tube amps):12 – 75 W @ 8ΩRecommended Amplifier Rating (SS amps):25 – 150 W @ 8ΩDriver DetailsInput 1:20 Watts8″ Full Range1″ Fabric Dome Tweeter (13,000 Hz and up)Super Tweeter (40,000 Hz)Input 2:Up to 150 Watts1 X 10″ Woofer45-100Hz @ 1st Order 6dB SlopeDimensionsH: 41.8″ (106.0cm) W: 15.5″ (39.5cm) D: 19.2″ (49.0cm) Weight: 10.9kgs (24lbs)