· Turn off all electronics and switch the speaker in question with one of the other speakers that is working correctly. Turn everything back on, and determine whether the problem has followed the speaker or has remained in the same channel. If the problem is in the same channel, the source of the problem is most likely with your receiver or amplifier, and you should consult the owner's manual for that product for further information. If the problem has followed the speaker, consult your dealer for further assistance or, if that is not possible, visit www. com for further information. · Check all wires and connections between receiver/amplifier and speakers. · Make sure all wires are connected. Make sure none of the speaker wires are frayed, cut or punctured. · If more than one pair of main speakers is being used, check the minimum impedance requirements of your receiver/amplifier. If there is no (or low) bass output: · Make sure the polarities (+ and ­) of the left and right "Speaker Inputs" are connected properly. · Consider adding a powered subwoofer to your system for use with digital ". 1" surround formats. 3 SPECIFICATIONS Maximum Recommended Amplifier Power* Power Handling (Continuous/Peak) Nominal Impedance Sensitivity (2. 83V/1m) Frequency Response Crossover Frequencies Ultrahigh-Frequency Transducer High-Frequency Transducer Midrange Transducer Mid-Bass Transducer Low-Frequency Transducer Magnetic Shielding Terminals Dimensions (H x W x D) Weight per Speaker 250W 125W/500W 8 Ohms 92dB 32Hz ­ 40kHz (­3dB) 280Hz, 1. 2kHz, 4...