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
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