https://www.owner-manuals.com/-manuals-1-20a.html?alpha_filter_id=74
See YAMAHA JX20 Owner's Manual page 7 (block diagram) for the difference between amps JX20 and other JX series amps.
See YAMAHA JX20 Owner's Manual page 7 (block diagram) for the difference between amps JX20 and other JX series amps.