俱舍論疏 1.164

1.164

論「聲唯八種至差別成八」，第二舉數列名。前四種聲，各有可意、不可意別，故成八種。

Regarding the treatise text: "Sound is of only eight kinds […] differentiated into eight": this is the second part, presenting the number and enumerating the names. Each of the preceding four kinds of sound has the distinction of being agreeable or disagreeable; therefore, they comprise eight kinds.