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2. List of Bose home audio products - Wikipedia

   en.wikipedia.org/wiki/List_of_Bose_home_audio...

   The 131 Marine Speaker was a flushmount speaker that was meant to be installed on a boat, and could be connected to the boat's receiver. The Freespace 51 is an "in-ground" landscape speaker that features omnidirectional, 360-degree sound projection, as well as a bass port.

3. Marine VHF radio - Wikipedia

   en.wikipedia.org/wiki/Marine_VHF_radio

   Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft.

4. Vehicle audio - Wikipedia

   en.wikipedia.org/wiki/Vehicle_audio

   Mobile audio power amplifiers. Amplifiers increase the power level of audio signals. Some head units have built-in stereo amplifiers. Other car audio systems use a separate stand-alone amplifier. Every amplifier has a rated power level sometimes noted on the head unit with the built-in amplifier, or on the label of a stand-alone unit.

5. AN/PRC-117 - Wikipedia

   en.wikipedia.org/wiki/AN/PRC-117

   A PRC-117 radio and SATCOM antenna. The AN/PRC-117F/G radio is currently in use with the United States Navy Seabee and EOD teams in their MRAP and JERRV vehicles. [2] The radio is also in use by the United States Marine Corps, [6] United States Army, [7] USSOCOM, [8] United States Coast Guard, United States Air Force, [9] Royal Air Force, [10] Dutch Army, Spanish Air Force, British Army ...

6. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   An NYPD LRAD on top of a police humvee An LRAD operator wearing hearing protection LRAD on a navy ship. A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance.

7. Speaking tube - Wikipedia

   en.wikipedia.org/wiki/Speaking_tube

   They are sometimes preferred over Bluetooth or other radio technologies due to their simplicity and absence of batteries. The principle of the speaking tube can be found on certain playground equipment, which employs tubing connecting sound horns or other speaking boxes to allow voices to travel to separate points, for the amusement of the ...