ASROCK B660M Steel Legend Manual Del Usuario página 7

** If you use a 2-channel speaker, please connect the speaker's plug into "Front Speaker Jack". See the table below
for connection details in accordance with the type of speaker you use.
Audio Output
Channels
2
4
6
8
4
Front Speaker Rear Speaker
(No. 6) (No. 4)
V
V
V
V
Central / Bass
(No. 3)
-- --
V --
V V
V V
Line In
(No. 5)
--
--
--
V