Quoted from Number41:Has anyone upgraded the speakers in their Tommy? I was considering looking into a Pinball Pro or Flipper Fidelity speakers/sub set and I'm curious how dramatic the difference is with the stock sounds and music.
I've had at least four 1993/1994 DE games and everyone I replaced the cabinet sub with a Pinball Pro or Flipper Fidelity. It made a big difference to my ears. The backbox speakers are fine (unless they are ripped or beat up). You definitely have to adjust the crossovers when you install the new sub, but its a great addition for not much money.
I never tried an external sub on my Tommy, but I've used them on other games. If you want really punchy bass pick up one of those polk external subs that are on sale at amazon now for about the same cost as replacing your internal cab speaker.