Quoted from MT45:
Exactly - there is already a JJP factory installed noise filter on the game. I was getting noise just from topper sound bar AND, like I said the noise was only audible during boot up and when sitting in attract mode - no way you could hear it in gameplay. So this was a minor issue, and I added a $10 "fix". It might not be that noticeable to others nor worth the $10 to address it
Exactly. My CE came pre-installed with a noise filter but just like you pointed out, the noise from the sound bar was still noticeable during boot up (and in attract mode) so this is (hopefully) an easy and cheap fix.