低音炮

subwoofer

low / beneath / to lower (one's head) / to let droop / to hang down / to incline

bass

sound / noise / note (of musical scale) / tone / news / syllable / reading (phonetic value of a character)

to sauté / to fry / to dry by heating

to prepare herbal medicine by roasting or parching (in a pan)

cannon / CL:座[zuo4] / firecracker

variant of 炮[pao4]