The most valuable power amplifier is Switzerland. Because basically the most expensive amplifiers in the world are in Switzerland, such as Goldmund, DartZeel, and FMAcoustics (these spellings all look higher-end than Sony, AIWA, etc.). FMAcoustics, in particular, has always been considered the most expensive power amplifier out there. Therefore, it is generally believed that the most expensive power amplifier is the FMAcoustics268 preamp + 2011 power amplifier. The foreign price is about 330,000 US dollars, equivalent to RMB 2.21 million.