What has changed in the last 30 years? What new technologies and materials have come into the industry amplification? Transducers in a constructive relations have undergone minor changes, mainly because there were material with improved properties. The availability of power amplifiers, speakers made the actual development of large unit capacity. This was possible due to new heat-resistant materials and redesign of the magnetic system to improve heat dissipation. Using the new polymeric materials membranes speakers managed to reduce the mass of the moving system and increase the efficiency of the converter. There were powerful speakers 6-inch format, with drivers competing in the frequency range 300 …

3000 Hz. Began to use rare-earth magnetic materials, which reduced the weight of the speaker. JBL-based firm magnets has created a new design of magnetic circuit with a double coil. The increase in voice coil surface made it possible to increase capacity and enhance mid-range speakers. Powerful speakers tape for professional sound systems allowed to raise line array technology to a new qualitative uroven.Usiliteli moschosti sound became more powerful, more reliable, easier thanks to the use of power semiconductors. Power transistors, amplifiers allowed to perform large unit capacity, and power supply with frequency conversion – to drastically reduce the weight and dimensions of the amplifier. Powerful amplifiers were performed according to the scheme at D & H. The use of pulse-width modulation output of the amplifier reduce heat so that it became possible to reduce the height of even the most powerful amplifiers to 1U.