I have a brewery with a Gottlieb Aquarius that was just mechanically restored. It plays perfectly. I use powered studio monitor speakers at the brewery for music. When I have the speakers and pinball machine on at the same time, playing the game causes the speakers to loudly crackle and pop when the various coils fire. The speakers are on the same circuit as the pinball, but at a different outlet. Moving to a discrete circuit is not an option.

Cheers!

Noah

Warped Brewing Company in Sebastopol, in Sonoma County, California. I have a Bad Dudes arcade game as well. It's a video game themed brewery.

Edit: Scratch that, it's a double dragon. I confuse the two, due to them both sucking my childhood away.

Not quite open yet - my beer will be on tap at Barley and Hops in nearby Occidental. My tasting room opens early January. There is ANOTHER brand new brewery across the street from me called WoodFour which is also great. If you're back in the area, pop by for some pinball and a beer.

Ordered a line conditioner, hopefully that will help - but those are meant to protect the thing that is plugged into them, not feedback into mains. Hopefully it works that way too as a side effect.

Unfortunately, no luck. I purchased a quality line conditioner from APC, no effect whatsoever, except that connecting it to the Pinball machine caused the coils to be much weaker - the ball isn't fired at nearly a high speed. I tried connecting the line conditioner to the speaker. No luck. Tried surge protectors on everything. No luck. Tried surge protectors WITH line conditioner. No luck.

A musician friend suggested lifting the ground on the speaker. Since it's high up in the air, I'm not worried about getting zapped from it while touching a microphone... I'll report back.

Cheers.

EDIT: Forgot to mention, the pops stop happening if I disconnect the XLR (sound in). I believe this means that the interference is happening through the XLR cable, not the power. This makes sense, as a power conditioner wouldn't halt any EM interference through an XLR cable. I don't have, but could purchase one of those anti-hum boxes, but lifting the ground should probably give me the same effect, as believe that those anti-hum boxes are ground-loop eliminators.

_{Post edited by nbolmer : update}