Ok..so I've made a new discovery this weekend. It seems my 2420 drivers are fine, (they measure at 7.1 and 6.1 ohms), but I discovered why the one driver is intermittent occasionally. The bi-amp switch inside has blades which swipe overtop a disc. Some of these blades don't contact very well. I tried to gently pry them tighter, but I'm not sure if I fixed anything. Any idea on how to fix this? Can I purchase a new one?
Last question is it ok to have a difference between the drivers testing 7.1 and 6.1 ohms?
Thanks guys
Peter