FYI I'm currently making a mod to help with speaker hum/buzz. I have a Simpsons Pinball Party, and the hum was bothering me. I ended up finding this pinside discussion (https://pinside.com/pinball/forum/topic/tspp-speaker-humbuzz-fixed) which describes how to make the mod and how they work. The first post on that page has a video showing the process. I have them on Simpson's and Ripley's and they help immensely. If you'd like a pair and don't have the time or tools to make them, I will ship a pair to your door for $22. If interested please direct message me as I'm not here often. Thank you