1.This model has howling off function key.when it is turned on, it can avoid
  the howling from microphone. The echo of this model is liveness and sense
  of reality. And also it can connect to other Reverb.
2 .There are dual tone quality regulatory function and three microphone input
  in this model.
3.It has high quality digit IC form Mitsubishi.
4.Four bands frequency whit microphone:
  ① CLEAN,adapt to popularize.
  ② LENIE, can restrain whistle call, adapt to soprano and tenor.
  ③ MELLO,adapt to bass.
  ④ SOFT, adapt to professional singer
5.Double transformer for power supply make the work of amplifier more stabile
  and the effect of timbre more penetrative and more powerful.

Speaker suggestion：Karaoke speaker: KB-730 KB-630 BM-450

Specifications:
   Output Power： 250W+250W
   Frequency Response： 80Hz－13KHz±3dB
   Signal to Noise Ratio： ≥76dB <A standard>
   Separation： ≥30dB <A standard>
   T.H.D： ≤0.2%
   Power Requirements： ~220V/50Hz
   Net Weight: 16Kg
   Size(mm)： 430(L)x135(H)x390(W)