Ceiling speakers are used in public places, mainly for publicity, voice conference and background music. Good alto, poor bass, not a speaker for listening to music.

JBL ceiling speakers are expensive, a little better than ordinary speakers, and the bass is not good, because there is no big speaker, which is similar to the sound of car speakers.

Car horns don't have big horns, so use the best horns without bass.

Horn has no cutting-edge technology. Horn technology matured decades ago.

At present, the domestic well-known brand hivi horn has good quality.