Quoted from 85vett:For AC/DC I'd go with external sub. I have the Flipper Fidelity kit on mine and am actually pretty disappointed with it on this title. The external sub was the overall better move I made on the game.
You have two main options:
- Alligator clip method. You soldier (or crimp) some alligator clips to the end of some speaker wire. Connect the positive side wire to the positive terminal on the powered external sub and the neg to the neg. This is what I've done and was a great use of the alligator clips that come with the comet matrix light kits, just a FYI
- Buy the sound board add on. I haven't used it before but I've been told that it creates a cleaner and more powerful sound. I believe the board runs about $35. It connects to your stock board and adds pre-amp outputs. http://www.pinnovators.com/catalog/product_info.php?products_id=38
One thing to add. I also like to get the volume control button that goes in the tournament button location. Makes turning the sound up and down a breeze mid game as necessary. https://www.pinballlife.com/index.php?p=product&id=2894
You’ll overall get a better result with an external, enclosed, powered sub (ie anything you can plug directly into your stereo).
Cabinets just don’t seem to be well-suited for good bass, and none of the fancy pinball upgrade kits are using enclosed woofers (aka a sub) which you must have in order to get good punchy bass. Plus, the games’ amps don’t really provide enough power so you have to upgrade that too.
I asked Greg from PinballPro about it, and he said they didn’t have anything in that vein, but my impression was that they had not really like they had looked into it much. It’s more expensive, for sure, so it’s probably not a great business strategy for them.
Bottom line: an external sub has its own amp and enclosure and is far and away your best option