So I upgraded my MMR tonight. Results were impressive.

I did the Rockford 5.25 speakers and then a Kenwood 8" low profile subwoofer. The speakers in series obviously reduced volume so I had to go higher than normal. Definitely more clear in the highs, never heard the snare in main theme and Merlins Magic is defiantly nicer as well with the twinkling.

To get the sub to fit properly, I had to remove the mount plate and cut a bigger hole (ugh)... cutting a round hole with a scroll saw sucks balls. I'd recommend finding a hole saw if possible. I'll be adding a grill to the bottom of the cabinet to make it nice and tidy.

However upon first fire up and game, holy crap totally worth it. Clears the trolls without issue. My shaker hasn't come yet so that will be installed whenever it actually ships.

I didn't want an external sub and wanted a cleaner more integrated install. I was going to add a plate amp if needed however the stock 50 watts seem to do just fine. The sub is a "wee" but larger than the stock one

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Here was stock vs Kenwood

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So I've taken this to another level now...

I have a monoblock amp powering the sub now so I have more control over it. I wired up a second 12v 30a power supply for the amp and to power some future led lights as well. The amp trigger is fired off the main MMR power supply so it doesn't turn on without the game on.

I also ordered yet another new sub for it and found a sealed enclosure box that should fit under the trolls. This should clean up the sound considerably, be more effecient and direct more sound out instead of shaking things in the cabinet. I should have that early next week and will report back on how it sounds.

Yup external would have been cheaper but this is a much cooler setup

Wiring is all cleaned up and the new sub box fit. Just barely clears the trolls, but it works. Does not touch the troll brackets and does not interfere with the playfield in any way. Sound is much improved over free air and with the amp I have nice control over the sound.

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So seperate 30a 12v power supply to power amp and anything else i want to add rather than mess with stock stuff, plus the stock power supply isn't powerful enough to run a amplifier.

I used a 12v trigger from the stock converter to the amplifier (remote trigger input), however in order for that to work you need to tie the grounds together. So there is a ground tie between the stock converter and the additional 30a converter. Once those ground are tied then you can mix the 12v signals.

Hope that makes sense.

Just wanted to update that this setup has been working really well. The only rattle i have is actually the channel for the glass on the left side. Haven't figured out the best way to resolve that. The overall sound quality is excellent and having the subwoofer in the enclosure helped the performance and rattles.

Probably going to do the same setup on my other pins as well now.

All that being said, an external sub would definitely be easier

I submitted it a support ticket on it previously as well.