Double transfoumer fou power supply

(1) There are two ways of input: balanced input and unbalanced input and three modes
  can be chose: Stereo, MONO, bridgeable.
(2) With a delay circuit for relay, it can protect the speaker system, and adjust the shock
  wave when the produce is start-up.
(3) With dependable multiple protection: overload, over temperature, short circuit and
  delay of start-up. 
(4) Using low noise temperature control fan, if the temperature is exceed the safe setting,
  this unit will shut down automatically until the temperature is back to normal.
(5) With high precision longevity potentiometer, it can control the output power accurately.
(6) Using an up-to-date grounding technology, it make the noise is too low to hear.
(7) With high efficiency capacitor for power filter, the capacitor and nonpolar capacitor are
  import from U.S.A.
(8) Using separate quadrate transformer in the front of this produce for power supply, it keep
  the power amplifier working steadily, and use high quality powerful annularity transformer in
  the tail. 
(9) With American high quality big power audio tube.
(10) The design of the frame in this produce can avoid all the mechanical interfere and electrical   interfere.

Specifications:
   Rated out power(4Ω) 620W+620W
   Bridge(4Ω)  1200W
   T.H.D.： ＜0.16%
   Frequency Response： 20Hz~20KHz+2dB
   Signal to Noise Ratio： ＞93dB
   Separation： 70dB
   Input Sensitivity： 0dBu(775MV)
   Crosstalk： ≥80dB
   Input impedances： 20K Balance、10K　Unbalanced
   Protection： hight temperaure, DC, Peak current Limiters, short, start-up delay
   cooling： 2-stage fans,front-to-rear
   Power Requirements： ~220V 50Hz
   Dimensions(WxHxD)： 482x445x475mm
   Net weight： 22Kg