1.RAS-628  625  615 series is used plane direct-injection type design.
2.The box body is  used 18 cm plywood , it is rectangle and used polyester
  black pearl paint. It can  waterproof,sunscreen,wear-resisting and protect
  the speaker.    

   Frequency Response 30Hz-260Hz
   Sensitivity 100dB
   Impedance 4Ω
   Material quality Plywood
   Dimensions 100x60x47(cm)
   RMS 800W
   Peak Power 1600W