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A single amplifier can usually power a woofer and a tweeter only through a post-amplifier crossover filter, which protects each driver from signals outside its frequency range. Bi-amping of speakers requires double the channels of amplification and can be accomplished using two ordinary amplifiers in either a vertical or horizontal arrangement.
Bass guitar players who may use subwoofer cabinets include performers who play with extended range basses that include a low "B" string (about 31 Hz), bassists who play in styles where a very powerful sub-bass response is an important part of the sound (e.g. funk, Latin, gospel, R & B, etc.), and/or bass players who perform in stadium-size ...
A good selection of equalizer knobs and gain stages is standard on expensive amplifiers. If an amp has one or more preamp or gain knobs, the second volume knob may be called "master", "volume" or "post". Amplifiers for electric guitars are more likely than bass amps to have multiple "channels", but some bass amps also have channels.
Audio power is the electrical power transferred from an audio amplifier to a loudspeaker, measured in watts.The electrical power delivered to the loudspeaker, together with its efficiency, determines the sound power generated (with the rest of the electrical power being converted to heat).
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A video distribution amplifier (also known as a distribution amp or VDA) takes a video signal as an input, amplifies it, and outputs the amplified video signal to two or more outputs. It is primarily used to supply a single video signal to multiple pieces of video equipment.
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