I have a DSL40cr. I also have an 8 ohm (2x12) cabinet.  The DSL40 onboard speaker is plugged into the 1@16 ohm input.  When I run my 8ohm cabinet (plugged into the 1@8ohm output), can I run the onboard speaker at the same time, or do I need to unplug it? Asked another way, can I run the onboard 16ohm speaker and the 8ohm (2x12) cabinet at the same time?