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These Klipsch stereo speakers have a frequency response of 44 Hz to 24 kHz. At peak, the main stereo speakers' power handling ability is 600 watts with a minimum of 150 watts RMS with a sensitivity of the standard 8 ohms. They have a crossover of 1,400 Hz. The Klipsch RB-81 II can be stored on a bookshelf or wall mounted and come with threaded inserts for this purpose. They have a linear travel suspension to help minimize distortion and vibration. The front firing port allows for flexibility in where a person places the main stereo speakers. The Klipsch stereo speakers have a 1-inch titanium diaphragm compression driver at high frequency. At low frequency, they have an 8-inch cerametallic cone woofer. The inputs are binding posts for bi-wire or bi-amp. The Klipsch RB-81 II is 19 inches in height, 9.3 inches in width, and 12.3 inches in depth. This set of Klipsch stereo speakers weigh 27.5 lbs total.
Klipsch RB-81 II Bookshelf Speakers