You can't just look at the indicators when you look at the stereo. I've heard it myself, and it's most important to try it myself. Brands like BMB·BIK· BOSS are still good. Of course, you have to buy the real thing. The preprocessor usually amplifies the microphone signal and adds some equalization and reverberation effects. Yamaha has done a good job, or you can buy a machine similar to handle v8, and the effect is more professional. So is the microphone. Can't look at the indicators. You can only know if you sing it yourself. We recommend superlux top248s, Shure Beta58A and Sennheiser E945.