I have a set of Mackie CR4 speakers, and they’ve finally succumbed to the problem with the L/R powered speaker switch.

I’ve ordered some contact cleaner, hoping a squirt or two will sort that out. Really not looking forward to soldering it. But ifixit is there to help if I need to

https://www.ifixit.com/Guide/Mackie+CR3+CR4+L-R+Speaker+Selector+Bypass/145037