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2. Wireless speaker - Wikipedia

   en.wikipedia.org/wiki/Wireless_speaker

   Wireless speakers are loudspeakers that receive audio signals using radio frequency (RF) waves rather than over audio cables. The two most popular RF frequencies that support audio transmission to wireless loudspeakers include a variation of WiFi IEEE 802.11 , while others depend on Bluetooth to transmit audio data to the receiving speaker.

3. The 7 Best Wireless Surround Sound Systems for an Immersive ...

   www.aol.com/lifestyle/best-wireless-surround...

   Best Wireless Surround Sound Systems. Best for Audio Fanatics: Nakamichi Shockwafe Elite. Best Theater Sound: Sony HT-A7000. Best Value: VIZIO M-Series 5.1. Best Upgrade For A Wired System ...

4. Land mobile radio system - Wikipedia

   en.wikipedia.org/wiki/Land_mobile_radio_system

   A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld transceivers e.g. "walkie-talkies").

5. Comparison of radio systems - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_radio_systems

   World radio systems (Terrestrial) System Type Modulation Data rate Sidebands? Ch. Bandwidth Radio spectrum Sound Codec Digital subchannels SFN Metadata/RDS/RBDS; AM radio: Analog radio: Amplitude Modulation: N/A? 18–20 kHz: 148.5-283.5 kHz (Longwave) 510–1610 kHz (Europe) 510–1710 kHz (USA and Canada) N/A: N/A: No: None Motorola C-QUAM ...

6. Vehicle audio - Wikipedia

   en.wikipedia.org/wiki/Vehicle_audio

   Subwoofers: These speakers are designed to reproduce low-frequency sounds, particularly bass. They come in various sizes and power levels, and can be used to enhance the bass in a car audio system. Mid-range speakers: These speakers are designed to reproduce mid-range frequencies, such as vocals and instruments like guitars and pianos.

7. In-car entertainment - Wikipedia

   en.wikipedia.org/wiki/In-car_entertainment

   Once controlled by simple dashboards knobs and dials, ICE systems can include steering wheel audio controls, handsfree voice control, touch-sensitive preset buttons, and even touch screens on higher-end units. [1] Latest models of In-car entertainment systems are coming equipped with rear-view cameras along with side cameras for better safety. [2]