Friendly to having a fever for, choose appropriate before class amplifier, it is clipping important matter, because of such, the understanding of the class before be opposite, inside in have knowledge greatly. Have the player of regular qualifications and record of service to each, what class brings before is vexed, also resembling is slush of cold weather water, only he himself just knows.

Longtime, it is indispensable that book teachs us amplifier of the one class before the stage, because the n of question mark source of that moment is very low, amplifier of the class after can't be being driven. Today besides few number a flock of, we already can forget black glue (LP) disc, the class before speaking of so, now is to show one class is only decuple commonly the amplifier of enlarge class. Have enlarge class inside, we call the level before it does active, wraparound for, its composition is mark of question of a multichannel half select switch, sound control fader, tone control implement (today's Hi-End emphasizes former juice raw ingredient, reason this part is most also owe acted according to) , recording bypass equipment, and a decuple amplifier.

Can be today, digital dispatch source is popular, have machine of a lot of CD and decoder know exactly about sth with volt (Volt) plan output n, enough has of general sensitivity hind class is pushed to cut wave, at it is to have hostage doubt today is sluggish still need decuple enlarge level, change character, whether does the class before active still have existence value. Acting and appear, it is the class before doing not have those who put large action, the class before i.e. is passive. It retained question mark option and volume pilot function only. At present market is the class before counting a few not much passive only, belong to the progression that Wu Ji tastes, social status does not poor of course, by the sale price at them, make their public praise produced the effect of a few additional value, such fever the controversy that actor of active, passive what often appears in circle.

Before studying this debate deep, should clear up above all have a fever commonly a concept that friend often misunderstands, it is dynamic limits (DynamicRange) , simple for, this is to show question mark is mixed the most by force the weakest the contrast of the quantity between. General amplifier is a question mark enlarge, be at the same time the enlarge that makes same multiple by force with the weakest question mark, change character, the dynamic scope of mark of the question after theoretic classics magnifies won't increase, can keep changeless only at most. Have a few major of course, especially the material that recording studio uses, if volume is patulous implement (VolumeExpander) , ability can promote dispatch artificially the dynamic limits of date. Another index is dispatch a confusion of voices is compared (SignaltoNoiseRatio) , when mark of a question passes amplifier, question mark itself and it accessary noise magnifies at the same time, change character, amplifier is won't the noise purify with question mark accessary itself or low-key. Contrary, can add however via the question mark of enlarge on the noise of amplifier itself. The 3rd appearance is lack fidelity, manage together, primary question mark if itself already was contained certain lack fidelity, after the course magnifies, this breaks what won't be missing suddenly really, contrary, the question mark of classics enlarge is to be able to be added go up of amplifier itself lack fidelity.
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