These are really big speakers [109 x 40 x 24 cm (HxDxW)]. But as Klipsch is known, they are already easy to control with a small amplifier because of the high efficiency of the speakers. But they can also be controlled with a very large amplifier, the speakers can withstand a peak load of no less than 600 Watt! Super high quality world class speakers from Klipsch. Working perfectly as they should. Ready for years of playing music. To deliver this product properly, it is packed in very strong boxes, thereby encased in bubble wrap. In addition to the strong packaging, the box is labeled as fragile, using orange "fragile" tape. In case of further packing requirements please message after purchase. Features & Details 35Hz - 23kHz 8 ohms 150 w (600 w peak) 97dB @ 2.83 volts/1 meter Brand Klipsch Series Synergy Model F-3 Type Floorstanding Speakers Sold As Single Driver Units Tweeter: 1" aluminum dome tweeter High Frequency Horn: 6.5" 90 x 60 Tractrix Horn Woofer: Two 8", magnetically shielded woofers Power Rating 150 w (600 w peak) Frequency Response 35Hz - 23kHz Nominal Impedance 8 ohms Sensitivity 97dB @ 2.83 volts/1 meter Cabinet Bass reflex via front-firing port Features Crossover Frequency: 2000Hz Dimensions & Weight 42" x 9.5" x 16" / 60 lbs