Includes (4) Definitive Technology ProMonitor 1000 Bookshelf Speakers Speaker Dimensions: 10.88" Height, 6.25" Width, 6.5" Depth Frequency Response: 47Hz - 30000Hz, Impedance: 8 ohms, Sensitivity: 91 dB Driver Complement: (1) 1" Tweeter, (1) 5.25" Midrange, (1) 5.25" Bass Radiator Orientation: Horizontal, Vertical Includes 4 Definitive Technology ProMonitor 1000 Bookshelf Speakers. Remarkably sophisticated with the sound quality of much bigger speakers, the ProMonitor 1000 boasts legendary Definitive Technology innovations, such as BDSS woofers, pure aluminum dome tweeters, and planar pressure coupled bass radiators. Its a pint sized marvel that delivers oversized home theater experiences. We took Definitive Technologys signature sound and our most heralded innovations BDSS woofers, pure aluminum tweeters, planar bass radiators and cooked them down to a size that fills any listening room or home theater with stunningly realistic audio. Use ProMonitor 2000 as stereo pairs or satellites for any number of surround channels. Mix and match with other ProCinema models such as the PC1000 Center Channel. Put them everywhere and aim them anywhere using their built in stands, or choose optional wall mounts or floor stands. ProMonitor 1000 utilizes the same aluminum tweeter material as our top floorstanding speakers. Aluminum is light and stiff, making it the ideal material for a driver that must move beyond 20,000 times per second to reproduce the highest frequencies we can hear. Youll hear clean, detailed highs that produce air and dimension in the room.