For people who really understand the difference between sound quality, a preamp will be a valuable asset, but less knowledgeable people need to learn more about the preamp and how to use it.
Amateurs singing in karaoke just for fun are usually not concerned about the quality of signal coming from a microphone to speakers. In an attempt to bring their hobby to the next level or even turn it into the source of income, they stumble upon multiple confusing nuances, seek instructions on the basics of sound engineering, and assemble their first audio systems through trial and error.
While assembling an audio system, you are likely to come across an offer to buy two amplifying units: a preliminary amplifier (also called “preamp”) and a power amplifier (also referred to as an end amplifier). If they are combined in a common unit, such a device is called an integral amplifier.
The purpose of a preamp is to amplify a weak signal to a linear level, that is, a standard level of recording systems. There are two types of preamps: a circuit inside larger equipment (for instance, audio interface) and an individual device. Therefore, the availability of a preamp is critical for the smooth operation of any microphone, but it is not obligatory to buy a separate unit.
As a rule, karaoke lovers are undemanding to audio equipment. The main thing is to have a working microphone, clearly audible sound, and no interference. Inexpensive devices are quite suitable for singing at home, but their capabilities and technical characteristics cannot satisfy a person engaged in music professionally.