1. Digital karaoke time-lapse reverberatio
2. Karaoke tonal function
3. High fidelity preamplifier
4. Particular microphone audio frequency function
5. Microphone`s signal channel and the music signal are  adjusted independently

Specifications:
   General harmonic distortion............less than 0.05% 1KHz
   Frequency response (music signal)...20Hz~25KHz+3dB（A standard ）
   Delay time...................................150ms\175ms\200ms (3 bands can select)
   Output impedance.................. ....1KW
   Input impedance..........................20KW (Unbalanced)
   Dynamic range............................105dB
   SNR.............................................more than 80dB(A Count right)               
   Separation..................................100dB
   Bourdon's frequence..................100Hz+10dB
   Alt's frequence...........................10KHz+10dB
   Consumed power...................... 10W