(1) OK series is design for the KTV room, Use high quality  loudspeaker t
  hat is produce by ourselves, there are three channel: high/mid/low frequency.
(2) With auto protect circuitry and professional crossover.
(3) It have to pass a strict test, this design is for the karaoke singing, the mid-frequency
  is clear and the bass is powerful. It can give you a feeling like vocal concert.

Specifications:
   Frequency Response 70Hz-15KHz
   Components Bass speaker-8"x1(Y8-1)  Mid-4"x1(Z100)  Tweeter-3"x1(QG25)
   Impedance 8Ω
   Peak Power 150W
   Sensitivity 90dB
   Dimensions(cm) 41x29x28