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Class a amplifiers sound quality analysis

  • Author:James
  • Source:http://www.jaskeyworld.com/
  • Release Date:2016-08-03

In static, a power amplifier and b power amplifier connected to pure resistive load, the test will be about the indicators, and even class a larger thermal noise.But the actual application, it is the true load (dynamic load), speakers, and the impedance of the different frequency when the speaker is different also, at this time of electroacoustic index will be inferior to pure resistive load indicators, transient distortion is produced.Due to the existence of the negative feedback and will feedback to the former level, this kind of distortion is key to the speaker system transient quality type design, uninterrupted by effective damping (control), and the higher the voltage build-up rate of the signal, the distortion more serious.For hifi speakers (Such as:NSP-0001), it is important to the quality of the speaker system inertia can by amplifier is effective damping (control). 

bluetooth pen drive speaker_01
B damping of the power amplifier can not effectively control the speaker, for any output only one arm and a half weeks at work, or pushing or holding, but it can't work at the same time, so it's a single direction of damping, namely whether the positive half cycle or negative half cycle, he only propelled the speaker work motivation, and does not produce control a pull back, to comprehensive damping, drive current must promptly reversing, here's the problem.
Input square wave, for example, may work when input signal wave are more complicated, for instance, when the signal goes up, the speaker can go to work according to the signal waveform, but when the signal suddenly stops, the speaker is due to the effect of inertia of the quality, does not stop, this time the voice coil is conducting A counter electromotive force generated arm and as output tube, and in the original globe B arm is conduction, and the counter electromotive force and inspired by negative feedback back to the top level has been enlarged to B arm output tube conduction, complete B power amplifier this special damping, because the process to zero, A moment lost free oscillation damping.Conduction change as the process finished, B arm, originally A arm of the conduction is the partial delivery pipe resumed conduction, and experience A zero damping moment to regain lost damping.So b damping of the power amplifier at any moment is of single direction, the speakers of damping is accomplished by running a zero phase, having a distortion in almost all the time. 

crystal bluetooth speakers_01
Class a amplifiers plus or minus two arms are conducting, to the damping coefficient of both sides, in the sudden high voltage rises, voice coil according to the waveform to action, the signal stops, the electric potential by the conduction of the complete pathway B arm, inertia is damping, cannot produce free oscillation, the potential can establish, class a amplifier the omnidirectional damping, forcing the vibration of the speaker always based on waveform to vibration signal.Class a amplifier speakers whether under the condition of different signal voltage will not make a transient distortion, can control the omni-directional damping, drive current commutation in time, so as to achieve the perfect sound quality.NSP-0004 a crystal speaker is a good example of this amp sound quality pure, high don't distortion bass heavy powerful mix, can put the perfect sound performance paragraphs audio freely.