1. With 15 kinds of DSP effect variety be changed, it can be adjusted automatically according to the clients demand. 2. 4 channel microphone input and 5 band equalizer, it is so easy for adjusting music tone and volume. 3.It can use left-right balance input, RCA andMIC input and two kinds of balance input. So this model can use for a hi-fi preamplifier and connect to the music signal input. 4. Particular microphone audio frequency function 5. Microphone`s signal channel and the music signal are adjusted independently Specifications: General harmonic distortion≤0.05%1KHz Delay time15 kindDSP effect Output impedance 1k Input impedance 20K Unbalance Dynamic range105db SNR80dbA Count right Separation100db Bass frequence100Hz±10db treble frequence10KHz±10db Frequency response 20HZ-25KHz±3db Consumed power10w