Speakers and public address equipment generate the sound for audible alarms, notifications, and public announcements. Speakers, subwoofers, and public address systems recreate and broadcast the audio signals they receive from their control system. Audio amplifiers and wiring equipment connect to speakers and provide enough power to reproduce the audio signal. Mounts and housings for speakers act as adapters that allow speakers to be installed in various locations. Microphones for public address systems connect to compatible amplifiers and convert spoken messages for reproduction over speakers. Megaphones are handheld speaker systems that amplify the user's voice to quickly communicate messages to groups of people.