Computer has no sound possible five: if there is no "Sound, video and game controllers" this one, it would have to look at is not sound bad, the host demolished, speakers, a sound card out again safe to go, and then tighten security open the computer to see how the situation, the performance level conference speakers, as is still the same, then your computer sound card to another to try to put out there is not recognized, if not on the computer, it may be your sound bad, take to repair or change a new one. (A lot of people are using the integrated sound card, so do not use removed. Passive speaker (Passive Speaker), also known as "passive speakers." Passive speakers that is, we usually use, crazy speakers inside without the amplifier circuit The ordinary speakers. passive speakers, though not with the amplifier, but often crossover network and impedance compensation circuit. active speaker means that the speaker has a set of internal circuit, conference speaker enthusiast, there is the role of the amplifier with the Most are active speaker. In other words, directly connected to the computer's sound card, you can use the. without going through a special amplifier as a result there are a bundle of circuits and amplifier, it will cause some resonance, electromagnetic and other interference, influence speaker sound quality speakers, Wuhan Jiuhua video, light of the future professional speaker Jiuhua video provided by Wuhan Engineering Co., speakers, Wuhan Jiuhua video, light of the future professional speaker Video Jiuhua Wuhan Engineering Co., Ltd. (www.jowa- tech.com) this year introduced a new upgrade, the above picture is for reference only, please call the telephone or pictures on this page, for the latest information, contact: Mr. Lu.