Our product is a 2.0 passive #speaker, without a built-in power amplifier, it needs an external power amplifier to use. It is suitable for changing car CD to home, home theater as the main #speaker or surround box, teaching #speaker or conference room #speaker, etc.1.5" silk dome tweeter with crisp and clear high-frequency response.Treble is the soul of a system, and her tone, transient texture, dynamic compression, distortion and other factors often play a decisive role. 4"Professional mid-bass is full and magnificent.The newly designed 4-inch mid-woofer speaker, high-stroke damping PP diaphragm, long-stroke high-power design, large dynamic low-frequency output capability, bass shake the world. Cooperate with energy-absorbing rubber suspension to ensure low frequency dive as low as 40HZ.#System Type: Inverted speaker system #Drivers Configuration: Professional 4-inch mid-bass, professional 1.5-inch silk dome tweeter #Frequency Range: 40Hz-20kHz+--3dB(Free Space) #Active Crossover Frequency: 3.0Hz #Separation: 86dB #Finish: embossed wood grain box #Dimensious(WXDXH): 150*230*235mm #N.W:each 2.6kg