Did you contact SAMPSON TECHNOLOGIES???
The PROBLEM with Mackie and other equipment made in China is that it has really poor parts and service support. (or none at all)
Mackie owners are grabbing up USED or BROKEN equipment and using it for parts. Be on the lookout.
When Mackie first appeared, the media DROWNED us in hype about how GREAT it was....
But we learned that the Chinese don't support the equipment they manufacture, and now we have piles of Mackies, with NO parts to fix them.