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2. Megaphone - Wikipedia

   en.wikipedia.org/wiki/Megaphone

   A megaphone, speaking trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction. The sound is introduced into the narrow end of the megaphone, by holding it up to the face and speaking into it, and the sound waves ...

3. List of Bose portable audio products - Wikipedia

   en.wikipedia.org/wiki/List_of_Bose_portable...

   The SoundLink Max was released on 16th May 2024 for $399. As of 2024, it is the biggest sounding portable speaker designed by Bose. The system uses Bose articulated array with 3 transducers across the front speaker to deliver a spacious stereo sound. Two custom designed passive radiators are responsible for its big bass. Audio can also be ...

4. Wireless speaker - Wikipedia

   en.wikipedia.org/wiki/Wireless_speaker

   The receiver/speaker unit generally contains an amplifier to boost the audio signal to the loudspeaker; it is powered either by batteries or by an AC electric outlet. [2] The signal frequency range used by wireless speakers is generally the same as that used by cordless telephones – 900 MHz. The RF signal can traverse walls and floors/ceilings.

5. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   A late 19th-century speaking trumpet used by firefighters A small sports megaphone for cheering at sporting events, next to a 3 in (8 cm) cigarette lighter for scale. From the Ancient Greek era to the nineteenth century, before the invention of electric loudspeakers and amplifiers, megaphone cones were used by people speaking to a large audience, to make their voice project more to a large ...

6. Powered speakers - Wikipedia

   en.wikipedia.org/wiki/Powered_speakers

   An active full-range loudspeaker. Powered speakers, also known as self-powered speakers and active speakers, are loudspeakers that have built-in amplifiers.Powered speakers are used in a range of settings, including in sound reinforcement systems (used at live music concerts), both for the main speakers facing the audience and the monitor speakers facing the performers; by DJs performing at ...

7. The 9 best rechargeable hearing aids, according to hearing ...

   www.aol.com/lifestyle/best-rechargeable-hearing...

   In the past, rechargeable hearing aid batteries worked similarly to rechargeable AA batteries (Z-Power), and often caused issues and frustration for both the patient and the Audiologist, says Thakkar.