QSC speakers are American-made high-power professional stage speakers.
Professional speakers are stage speakers, suitable for stage performances singing or square concerts or promotional activities to use high-power speakers.
The speaker quality is good, but not suitable for home use --- because it is not HiFi sound quality (professional speakers sound more rough - midrange good, bass treble a little worse), and the power is very large, you need to amplifier is very large before you can launch a good sound; if the amplifier power to put a small, the sound distortion is very large, it is difficult to hear.