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2. List of car audio manufacturers and brands - Wikipedia

   en.wikipedia.org/wiki/List_of_car_audio...

   Monster Cable (manufacturers speaker wiring) Nakamichi (also an OEM option for Lexus vehicles) Naim (specially for ' Bentley ' a British brand) Orion. Panasonic (a brand of Matsushita Electric Industrial Co.) (manufacturers Fender and ELS sound systems for Volkswagen and Acura vehicles) Parrot Automotive. Pioneer (also an OEM option for many GM ...

3. 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.

4. Constant-voltage speaker system - Wikipedia

   en.wikipedia.org/wiki/Constant-voltage_speaker...

   Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, 100 or 210-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products ...

5. Power amplifier classes - Wikipedia

   en.wikipedia.org/wiki/Power_amplifier_classes

   Power amplifier classes. In electronics, power amplifier classes are letter symbols applied to different power amplifier types. The class gives a broad indication of an amplifier 's characteristics and performance. The first three classes are related to the time period that the active amplifier device is passing current, expressed as a fraction ...

6. Valve audio amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_audio_amplifier

   A valve audio amplifier (UK) or vacuum tube audio amplifier (US) is a valve amplifier used for sound reinforcement, sound recording and reproduction. Until the invention of solid state devices such as the transistor, all electronic amplification was produced by valve (tube) amplifiers. While solid-state devices prevail in most audio amplifiers ...

7. Motorboating (electronics) - Wikipedia

   en.wikipedia.org/wiki/Motorboating_(electronics)

   Motorboating (electronics) In electronics, motorboating is a type of low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that sometimes occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones. [1 ...