What's the difference between stealth audio and traditional audio?

The invisible audio is very thin and can be installed in the wall. The outside is as beautiful as the wall. But the disadvantage is that it is difficult to maintain in the future, the sound performance is not as good as that of conventional audio, and the sound pressure can not reach the expected effect. Karaoke is definitely not good, and the home theater is reluctant, so we can only use the surround box. Subwoofers still need traditional speakers, so stealth audio is mostly used for indoor background music, such as cafes and western restaurants. ..