こえ
voice
koe
JMdict 1380440
いいgood声(こえ)voiceだね
What a nice voice
The i-adjective いい (nice) sits directly before the noun 声(こえ) (voice) it describes. The plain copula だ (is) states it casually, and the final ね (right?) invites agreement — “a nice voice, isn’t it?” — turning a remark into something shared.