Active Speaker (Active Speaker), also known as "active speakers." Usually it refers to high-end professional speaker JBL speakers with a power amplifier, such as multimedia computer speakers, active subwoofer, as well as some new home theater active speakers. Active speaker amplifier circuit as built, the user does not have to consider the problem of matching with the amplifier, but also easy to use the lower level of the audio signal directly drives. Also recording professional sound reinforcement speaker role, there are some professional with built-in amplifier circuit monitors and use built-in electronic crossover circuitry and an amplifier electronic frequency sound can also be included in the scope of powered speakers. In other words, the subwoofer belong to the most professional sound engineering speaker EV, is not all sound. Generally 7.1,2.1,5.1, that point 1 is the subwoofer. Center Front Surround HAIR treble, bass subwoofer hair, from the unit will be able to see the difference between the structure of the speaker, lz if you want more sound knowledge of aspects of sound you can go and see the forum talking about monitors, probably many people are heard inside the field of professional audio, which is still unknown. This is from the speaker to talk about classification, generally divided into the main speakers use according to the playback speakers, monitors and back to listen to several speakers. High-end professional speaker JBL, speakers, Wuhan Wuhan Jiuhua Jiuhua video provided by video Engineering Limited. Video Jiuhua Wuhan Engineering Co., Ltd. (www.jowa-tech.com) strong, credible, in Wuhan of control and adjustment equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Jiuhua Wuhan innovative ideas will lead into the brilliant video and you work for a better future!