12. FL+: Front Left Channel Level Upward Adjustment Button.
13. FL-: Front Left Channel Level Downward Adjustment Button.
14. STANDB : ower Standb .
15. AU /2CH: 2.1CH Aux nput.
16. 5.1CH: 5.1CH Output Mode.
17. SW+: Subwoofer Channel Level Upward Adjustment Button.
18. SR+: Rear Ri ht Channel Level Upward Adjustment Button.
19. SR-: Rear Ri ht Channel Level Downward Adjustment Button.
20. FR+: Front Ri ht Channel Level Upward Adjustment Button.
21. FR-: Front Ri ht Channel Level Downward Adjustment Button.
22. COA : Coaxial nput