The difference in the harmonics of Classical guitars and the Acoustic guitars is also related to their sizes. Acoustic guitar is slightly bigger than Classical guitar. The size difference along with different materials for strings and the bracing in the body produces different harmonics and hence different timbres. Because of the difference in the sound, both types are used in a variety of musical styles through both can be interchangeably used in almost any style chosen by the musician. Also, the Classical guitar is meant to be played with fingers unlike Acoustic guitar, that contributes to its mellow sound. Acoustic guitar is played with a plectrum to produce sharp sound and tense strumming. Note that guitars are plucked instruments while 小提琴和小提琴 are bowed instruments. As a general view, the Classical guitar is preferred more for classical music than for the modern musical forms.

古典的(classical)和原声吉他与音乐听众有关，而不是与吉他的演奏有关——这两种吉他演奏的音乐类型多种多样。还有，吉他的和声(acoustic guitar has to do with the music listeners rather than the playing of the guitars- the variety of musical genres played on these two types of guitars. also, the guitar harmonics)的区别  

Also see: The 吉他vs.锡塔