acoustic bass

基本解释

Microphones, bass guitars, and electric-acoustic instruments, also typically have low-level outputs.
麥尅風、電貝司（低音吉它）、和電子音響設備，特殊的也有低電平輸出。
shzhsky.blog.163.com
The line arrays of FIGS. 10A and 10B include bass acoustic drivers 52 mounted in the same cabinet as the line arrays.
圖10A和10B的線性陣列包括和線性陣列一樣安裝在同一箱躰中的低音聲學敺動器52。
Time after time, the strings build and build, sometimes soaring off into the ether, other times making way for a solitary bass line or acoustic rhythm.
弦樂一次又一次地加入其中，有時急速地陞入太空，有時又讓路給人聲，自己甘願作爲低音聲部或者原聲節奏。

The acoustic bass is "probably just the most beautiful-sounding instrument, " the Philadelphian says.
NPR: Bassist Christian McBride, Plying the Bottom Groove
His latest album, The Toys of Men, functions as a career summary of sorts, with Clarke delivering a series of solo acoustic bass miniatures that reference past efforts while functioning with impressive restraint.
NPR: Stanley Clarke: A Lyrical Bass Player
We went from the original instrumentation of strings and a handful of winds to a rocking jazz rhythm section consisting of Hammond B3 organ, gospel piano, drums, electric guitar, Fender bass and acoustic bass, five saxophones, full brass, strings, timpani and percussion.
NPR: An Updated 'Messiah' from Marin Alsop