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2. Roland CUBE - Wikipedia

   en.wikipedia.org/wiki/Roland_CUBE

   A multi-purpose battery-powered portable amplifier featuring 5 watt stereo power and two 4" speakers. It features a microphone channel and instrument channel with tone, delay/reverb and chorus controls. [1]

3. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   Each system consists of a mixing board, sound processing equipment, amplifiers, and speakers. The microphones that are used to pick up vocals and amplifier sounds are routed through both the main and monitor systems. Audio engineers can set different sound levels for each microphone on the main and monitor systems.

4. Yorkville Sound - Wikipedia

   en.wikipedia.org/wiki/Yorkville_Sound

   In 1966, more products were introduced including the YVM-1 "Voice Master", a portable 45 watt tube amplifier combined with a four-channel microphone mixer. The Voice Master contained 1/4-inch phone jacks for PA speakers, a master volume control, treble, mid-range and bass tone controls and patching points for the TR-1, a spring reverb unit made ...

5. Sound reinforcement system - Wikipedia

   en.wikipedia.org/wiki/Sound_reinforcement_system

   Audio feedback from microphones occurs when a microphone is too near a monitor or main speaker and the sound reinforcement system amplifies itself. Audio feedback through a microphone is almost universally regarded as a negative phenomenon, many electric guitarists use guitar feedback as part of their performance. This type of feedback is ...

6. Wireless speaker - Wikipedia

   en.wikipedia.org/wiki/Wireless_speaker

   The receiver/speaker unit generally contains an amplifier to boost the audio signal to the loudspeaker; it is powered either by batteries or by an AC electric outlet. [2] The signal frequency range used by wireless speakers is generally the same as that used by cordless telephones – 900 MHz. The RF signal can traverse walls and floors/ceilings.

7. Powered speakers - Wikipedia

   en.wikipedia.org/wiki/Powered_speakers

   An active full-range loudspeaker. Powered speakers, also known as self-powered speakers and active speakers, are loudspeakers that have built-in amplifiers.Powered speakers are used in a range of settings, including in sound reinforcement systems (used at live music concerts), both for the main speakers facing the audience and the monitor speakers facing the performers; by DJs performing at ...