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For most audio applications more power is needed at low frequencies. This requires a high-power amplifier for low frequencies (e.g., 200 watts for 20–200 Hz band), lower power amplifier for the midrange (e.g., 50 watts for 200 to 1000 Hz), and even less the high end (e.g. 5 watts for 1000–20000 Hz).
Large transformers (above 200 watts) begin to suffer from high frequency attenuation due to self-capacitance. [4] More expensive: If high-power loudspeakers are used with an emphasis on low frequency response, the required transformers will be much larger and will add significant cost to the project. In some areas, building and electrical codes ...
The actual electric power may vary from about twice the nominal power down to less than one tenth. Loudspeaker efficiency is measured with respect to nominal power in order to emulate the situation outlined above where a low internal impedance amplifier is used with a loudspeaker. The convention is to supply one nominal watt during testing.
Thus, a 100 W driver (A) rated at 92 dB for 1 W @ 1 m sensitivity puts out twice as much acoustic power as a 200 W driver (B) rated at 89 dB for 1 W @ 1 m when both are driven with 100 W of electrical power. In this example, when driven at 100 W, speaker A produces the same SPL, or loudness as speaker B would produce with 200 W input. Thus, a 3 ...
Power handling: 200 watts (Peak handling of 1000 watts at 10 ms with no distortion) Recommended power output of the amplifier: from 15 watts; Overall Dimensions: 94.5" x 28.5" x 38" (HxWxD) Weight: 550 - 650 lbs. per speaker
Large keyboard amplifiers designed for shows in large clubs or halls have 200 to 300 watts of power, a 12-inch or 15-inch speaker (or two 12-inch speakers), and a horn-loaded tweeter. Some keyboard amps may be equipped with a compressor or limiter to protect the speaker from damage when the amplifier is being used at high volume levels.
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