Energy 3.1e speaker Very good condition Sound superb.. Built quality is very solid. ! All original...consecutive serial numbers. Great performance, especially at this price. Here's the spec story: Made in Canada Energy Speakers are a world renowned loudspeaker. What made it special when it launched was its technological innovations. It featured an 8" polypropylene woofer and a ¾" dual Hyperdome tweeter the first tweeter in the world to cross over at 1.8 kHz as opposed to the industry standard of 4 kHz. It was a radically different speaker that not only exceeded Energy's design and performance expectations in blind listening tests; it performed head and shoulders above anything else in its class proving that Energy's theories were correct. Bass reflex with Front Port two way mirror-image speakers match 1/8 dB left & right (amazing). The American National Bureau of Standards and the Canadian National Research Council subsequently selected Energy as their reference speaker . SPECIFICATIONS • Manufacture: Energy• Nation: Canada• Model: 3.1e• Circa: 1992•Finish: Black Ash• Power Handling: • Frequency Response : 40Hz - 20Khz (+/- 3db)• Sensitivity: 87db SPL (2.83W/M)• Usable Bass (-10 dB Anechoic ): 34 Hz• Driver Complement: 2 way vented.• Woofer: 8” inch Quad centric driver PC CON• Tweeter: 3/4 inch “e” Hyper-dome• Crossover Frequency: 3000 Hz• Height: 19 1/4 inches • Width: 9 5/8 inches• Depth: 8 7/8 inches• Weight: 16 pounds each *Stands not included*