tā / bǎ / dī yīn lǎ ba / de / xiàn / jiē fǎn / le / jié guǒ / shēng yīn / biàn de / hěn / mèn

他把低音喇叭的线接反了，结果声音变得很闷。

He wired the woofer in reverse, and the sound became very muffled.