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Typical push–pull audio tube power amplifier, matched to loudspeaker with an impedance-matching transformer. Audio amplifiers typically do not match impedances, but provide an output impedance that is lower than the load impedance (such as < 0.1 ohm in typical semiconductor amplifiers), for improved speaker damping.
The variation in loudspeaker impedance is a consideration in audio amplifier design. Among other things, amplifiers designed to cope with such variations are more reliable. There are two main factors to consider when matching a speaker to an amplifier.
A speaker L pad is a special configuration of rheostats used to control volume while maintaining a constant load impedance on the output of the audio amplifier. [1] It consists of a parallel and a series rheostat connected in an "L" configuration.
This is called impedance matching or a matched connection. In this case, Z S = Z L, DF = 1/1 = 1 . The actual output impedance for most devices is not the same as the rated output impedance. A power amplifier may have a rated impedance of 8 ohms, but the actual output impedance will vary depending on circuit conditions.
Because of their inability to drive low impedance loads directly, valve audio amplifiers must employ output transformers to step down the impedance to match the loudspeakers. Output transformers are not perfect devices and will always introduce some odd harmonic distortion and amplitude variation with frequency to the output signal.
Reduces the 6dB attenuation incurred by impedance matching, which helps by reducing the amount of make-up amplification required [5] and by maintaining a high signal-to-noise ratio. [6] [4] However a transformer can be used instead to match impedance and provide better signal-to-noise. And the 6dB attenuation can be easily be made up in the ...
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