In progressionem historiam de sano technology potest dividi in quattuor gradus: tubo, transistor, integrated circuitu et agro effectus transistor.

In MCMVI, American de Forrest invented vacuo Transistor, quod pioneered humana electro-acusticus technology. Bell Labs was invented in 1927. After the negative feedback technology, the development of audio technology has entered a new era, such as Williamson amplifier has successfully used the negative feedback technology to greatly reduce the distortion of the amplifier to the 1950s, the development of the tube amplifier reached one of the most exciting periods, a variety of tube amplifiers emerge in endlessly. Quia sonus color tubi amplior est suavis et circum, est etiam malle a FANATICUS.

In 1960s, in cessum transistores fecit in ingens numerus audio Enthusiasts Intra in latior audio mundi. Transistor Amplifiers habere characteres delicata et movere timbre, humilis distortione, wide frequency responsio et dynamic range.

In mane 1960s, Civitatibus Foederatis Americae primum introducta integrated circuits, quae sunt novum membra audio technology. In mane 1970, integrated circuitus paulatim sonus industria propter altum qualitas humilis pretium parva volumine plures munera et. Sursum autem modo, densissima film audio integrated circuits et operational amplifier integrated circuits sunt late in audio circuitus.

In medium-1970s, Japan produci primum agro effectus operis commendaticiis tubo. Quia in agro effectum potentia tube habet characteres pura electronice tubo, densissima et dulcis sono color, et dynamic range de XC DB, thd <0.01% (100khz), quod mox factus vulgaris in audio. In multis amplifiers hodie, agro effectum transistores sunt sicut ultima output.

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XII-inch plena range entertainment speaker