(1) With a especial switch for changing the sound field mode. It can satisfy every
  philharmonic people in any place.
(2) When the sound feild change to "Outdoor", the mediant is  resounding, it can
  be hear in long-distance. The treble is clear and the bass is powerful.
(3) When the sound feild change to "Room", the bass is rich and magnetism, the
  treble is interesting and pleasant to listen, the mediant is more soft.
(4) With two fans and good looks.

Specifications:
   Input Sensitivity：......................0dB(775mV)
   S.N.R：.....................................93dB 
   Separation：..............................70dB
   intermodulation distortion：..........0.16%
   Output power：..........................420W x2 (4 ohm)
   Bridge power：...........................680W (4 ohm ) 
   Weight：....................................21Kg
   Frequency Response：.................20Hz ~ 40KHz   3dB
   Power supply：...........................~220V    50Hz
   Size(mm)：.................................483(L) x 88(H) x 475(W)