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2. 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.

3. 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").

4. CarPlay - Wikipedia

   en.wikipedia.org/wiki/CarPlay

   Wireless CarPlay works by having the phone exchange network credentials with a supporting CarPlay receiver over Bluetooth, establishing a two-way Wi-Fi connection. Alternatively, it is possible to use a third-party dongle adapter plugged into the car infotainment system's USB port to enable a wireless connection. This still requires a car ...

5. Mobile radio - Wikipedia

   en.wikipedia.org/wiki/Mobile_radio

   Many radios are equipped with transmitter time-out timers which limit the length of a transmission. A bane of push-to-talk systems is the stuck microphone: A radio locked on transmit, which disrupts communications on a two-way radio system. One example of this problem occurred in a car with a concealed two-way radio installation where the ...

6. Alpine Electronics - Wikipedia

   en.wikipedia.org/wiki/Alpine_Electronics

   At the Alpine Museum in Japan there is a model "7307" radio/tape recorder (circa 1981) [3] shot by an American (Roger Holdaway of SpeakerWorks in Orange Ca Archived 2018-08-10 at the Wayback Machine) using a .45-caliber pistol at a distance of 4 feet (approx. 1.22 Meters). The owner, frustrated with the performance of the product, shot the unit ...

7. 2.4 GHz radio use - Wikipedia

   en.wikipedia.org/wiki/2.4_GHz_radio_use

   Bluetooth devices intended for use in short-range personal area networks operate from 2.4 to 2.4835 GHz. To reduce interference with other protocols that use the 2.45 GHz band, the Bluetooth protocol divides the band into 80 channels (numbered from 0 to 79, each 1 MHz wide) and changes channels up to 1600 times per second.