Occupy Gartner of market survey firm forecast, the sale of amplifier of D assonance frequency will rise 688 million dollar from the 334 million dollar 2006 2011, compound year add rate for 15.6% . Gartner expresses in weekly, what frequency broadcasts equipment is energy-saving with contractible space demand, will be the main factor that promotes this market growth. Flat TV (include plasma TV and liquid crystal TV) the space that is used at coming loose to heat up is limited, because this used number with 1 million plan 10 made of baked clay D kind amplifier. Predicting D kind the amplifier growth in system of domestic movie theater and stereo radio domain rate is rapidder, 2011 sale 2 from 2006, 1 million dollar rises to 9, 5 million dollar, compound year add rate for 34.6% . As a result of D kind amplifier use transistor regards switch of supersonic frequency frequency as device, because this compares AB kind amplifier efficiency is taller, and calorific less, can save the space that radiator takes up. But, some people still suspect his the acoustic quality of frequency. In consuming electronic application, d kind the growth rate of amplifier is gotten more quickly than special frequency parts of an apparatus much, predicting to part is 15.6% with 4.4% . The frequency amplifier domain in predicting to consumed ASSP market 2011 rises the 739 million dollar from 2006 918 million dollar. Growth of this kind of high speed may make D kind amplifier domain attracts newly established company and investor.