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2. Amplifier - Wikipedia

   en.wikipedia.org/wiki/Amplifier

   An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude (magnitude of the voltage or current) of a signal applied to its input ...

3. Pignose - Wikipedia

   en.wikipedia.org/wiki/Pignose

   A Pignose amplifier (on the right), teamed with a Takamineguitar and a Meinl cajonpercussion instrument. Pignose-Gorilla, commonly known as Pignose, is a manufacturer of portable, battery-powered guitar amplifiers, as well as AC-powered practice amps and guitars. The company was founded in 1969 by Richard Edlund[1]and Wayne Kimbell.

4. Headphone amplifier - Wikipedia

   en.wikipedia.org/wiki/Headphone_amplifier

   Effectively, a headphone amplifier is a small power amplifier that can be connected to a standard headphone jack or the line output of an audio source. Electrically, a headphone amplifier can be thought of as an amplifier that presents a very high input impedance (ideally infinite) and presents a lower output impedance (ideally zero) and larger ...

5. Audio power amplifier - Wikipedia

   en.wikipedia.org/wiki/Audio_power_amplifier

   Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus 1 Hi Fi integrated audio amplifier (1984). An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.

6. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.

7. Guitar amplifier - Wikipedia

   en.wikipedia.org/wiki/Guitar_amplifier

   Guitar amplifier. A guitar amplifier (or amp) is an electronic device or system that strengthens the electrical signal from a pickup on an electric guitar, bass guitar, or acoustic guitar so that it can produce sound through one or more loudspeakers, which are typically housed in a wooden cabinet. A guitar amplifier may be a standalone wood or ...