3 sentences

1. 这位歌手的高音唱得非常嘹亮。

   zhè wèi gē​shǒu de gāo​yīn chàng de fēi​cháng liáo​liàng.

   The singer's high notes are very clear and resonant.

   Source: Dong Chinese Dictionary

2. 这位歌手底气很足，高音唱得很轻松。

   zhè wèi gē​shǒu dǐ​qì hěn zú, gāo​yīn chàng de hěn qīng​sōng.

   This singer has great lung capacity and hits the high notes with ease.

   Source: Dong Chinese Dictionary

3. 你可以通过旋钮来调节音响的高音。

   nǐ kě​yǐ tōng​guò xuán​niǔ lái tiáo​jié yīn​xiǎng de gāo​yīn.

   You can adjust the treble of the stereo with the knob.

   Source: Dong Chinese Dictionary