The speaker for the speeches. What and how

Speakers call devices that display the electrical impulses of the sound character of acoustic frequencies. The purpose of the device – hands-free reproduction of speech, musical accompaniment, etc. Electrical signals which are fed to the device, perform the activation of the mechanical vibrations of the system. Here https://comalfa.ru/category/gromkogovoriteli/ a selection of speakers that are suitable for performances and tours. The speaker for the speeches. The functionality of the devices If a person needs to take you on a tour, and the number of tourists is very [>>>>]