How to make a speaker amplifier

Friends, acoustics is a discipline, speakers, amplifiers are hardware, these two good or bad directly affect the tone. Want to do speaker amplifier at least to understand the principle of the speaker's positive and negative poles connected to the line corresponding to the positive and negative poles of the amplifier, into the sound source can be played, the materials used to pay attention to the right mix and match will be out of a good tone, the sound will be good to hear. Full of streets, parks; hawking and square dancing with the sound system out of the tone, you like to hear? If you like the sound, I suggest you do not primping, directly buy a not much money, because you make your own words, time and energy materials, human and material resources, add up to far more than the square dance sound. Of course, if you are out of research, academic, innovation, that spend some silver is a must. If you are purely for fun, there is no excuse, if you are in the money, want to create a set of high-frequency lilting, mid-frequency warmth, the perfect effect of bass dive, it is best to carefully study the knowledge of acoustics, corresponding to the knowledge of the parameters and the function of the various components to go poking around, it may be possible to create a perfect sound system. Once in the 80s, 90s, Japan's big companies, the acoustics of the research to the fullest, creating a number of well-known audio systems; which "Aiwa, Sony, jvc, Pioneer, Kenwood, Shanshui, Panasonic, Sanyo, CEAT, Yamaha"...... Used a lot of human and financial resources to research and development of acoustics, can be said to redefine the acoustics, and even earn a lot of money. I still have a pair of jvc speakers, CEAT amplifier, sound that is really called "comfortable". Those brands mentioned above at the time a little bit of class price are in the five figures. Europe and the United States of Ev, JBL ...... those who do stage engineering, but also the price is very expensive. I did not want to say so much, but your question personally feel really big, unknowingly said so much. I hope to be able to help you.