Cable microphone, pre-amplifier, post-amplifier, speaker, this is the equipment used to sing K at home. Among them, the front stage of the power amplifier is tuning, also called effector. The latter stage is a pure power amplifier. There is also a combination of the two, called combined power amplifier. It's ok to sing with a computer, but the computer speakers are too small, and the bass speakers are mostly 4 inches, so the effect of playing accompaniment music is not good. You can consider buying a pair of 2.0-inch and 6.5-inch active speakers with high power and good sound effects.