ATC的單體長啥樣？

http://www.acousticfrontiers.com/atc-speakers-technology/?fbclid=IwAR052U4dRRLAABSNRXIzRPX_Ohi-fjyK2z2YB6BdyjVbP-XXa3XPgMTQyDQ
那磁鐵...夠發顛吧？

這篇幾個重點，
新的自製高音沒用磁液，以免老了之後衰退。

瘋狂的測試訊號振幅...35Vrms是135W/8ohm！

We specify our moving parts to have excellent mechanical stability and high internal damping at all drive levels and many listening tests are conducted using 25V – 35V rms swept sine waves.

最大音壓的測法

Pink noise with a 6dB crest factor is used with the IEC filter standard applied (for a closer approximation to a music signal). Tests are conducted in half space using a pair of loudspeakers.

pink noise的頻譜接近音樂的比重，低頻較重，而且低音單體的靈敏度與最高音壓較差，因此這數字該由低音單體決定；
half space等於擺在地面朝天打，實際居家運用空間更小，音壓會更高。

至於IEC pink noise filter

http://sound.whsites.net/project11.htm