2017年3月22日 星期三

BBC由B&W談高價喇叭

http://www.bbc.com/future/story/20150813-in-search-of-the-perfect-sound?ocid=ww.social.link.facebook

這篇就是給一般人看的短文,不過這段,出自Salfod大學裡的聲學專家

“There are two elements that people generally try to look at,” says Oldfield. “One is making low frequencies more directional and the other is making high frequencies less directional. You don’t want loads of energy in the low frequencies coming from behind but at the same time you want your high frequencies to be as wide as possible so no matter where you are in the room you get the same sort of experience.”
意思是,喇叭通常希望能做到,讓低音比較有指向性,讓高音比較沒有指向性。
這當然是因為低音是球狀擴散,也會打到喇叭後面,你又沒坐在哪裡聽,浪費能量。

指出這點,就是要說個老題,如果說喇叭是個大砲,這炮要站的穩,砲彈打出去不會很快掉下來;
至於這炮後面有沒有個牆根本就與砲彈的速度沒關係好嗎?說後面要有硬牆是啥道理?哪位能不能解釋一下?難道說你這喇叭低音不夠,得靠喇叭發出去跑到後面的低音反射回來才夠嗎?