Has anyone had any issue with feedback when connecting a sub? I seem to get a constant hum despite where my crossover is set. This by all means could be a problem with my sub and not the machine. Just curious if anyone else has hooked up a sub to WOZ.

Will do, thanks! Is there any other way to fix a grounding hum without using a cheater plug?

Hey guys, I'm sure this question has been covered many times over, but I've been out of the scene for a few years. When I purchased my WoZ years back, I contacted JJP support about my light boards lighting up and flashing colors rapidly and essentially freezing in that state. I was told at the time it was a lose connection on one of the boards. I've since checked every connection on all the light boards and they were fine. But coming back to the pinball scene I noticed there is now a WoZ Lighting Upgrade kit for $800 (linked below and out of stock). Is this the fix for that issue and was this not covered by JJP for original buyers? I wasn't sure if there was some communication that went out saying this was covered under warranty or something.

http://store.jerseyjackpinball.com/Parts/Wizard-of-Oz-Parts/WOZ-Lighting-Upgrade-Kit.html

So you guys are both saying that I could replace the bad board, but the root problem still exists and the only long-term fix is the $800 kit? If so, that makes sense. If you don't mind me asking, what is the root cause that causes the issue with the boards? I appreciate the responses, thank you!

I'm a little frustrated my initial inquiry to JJP years ago was brushed off when there was a known issue. But, considering this is Pinside, I'll skip the rant as I'm sure it's been expressed many times over.