Applications:  It is sophisticated designed and ideal for Theaters, Music Halls, Large Discotheques, Night Clubs, KTV rooms, touring events etc. BT series speakers use a variety of techniques of multi functional amplification system, can meet the demand perfectly and maintain RX system concept. BT series adopts high sensitivity driver, collect with luxuriant appearance design concept, making BT series speakers applied to the fixed installation, music, theater, language, and the most ideal performance. Meanwhile, amazing SPL, and maintain the lightweight of the system, to be the big features of BT.◆ High sensitivity and transparent sound quality ◆ Providing ideal SPL and dynamic sound ◆ Quality NL4MP professional connectors applied ensuring a direct and stable signal transmission. ◆ Using advanced painting     ModelBT-728BTypeDual 18 Inch Passive Sub woofer SystemFrequency response34Hz－150Hz ±  3dBPower Handing1200W (RMS) 4800W (PEAK)Sensitivity112dB(1W@1M)Max SPL(@1m)143dB(PEAK/1M)LF driver1×18"(460mm) wooferNominal impedance4 ohmSpeaker cablesLF 1(+)1(-)Connector2×NL4MP SpeakonCabinetHigh Density plywoodDimensions(W x H x D)1240×575×680mm(W×H×D)Net Weight69kg