upgrading speakers on pinball machines is quite often a waste of time. As long as the stock speakers are in good shape they will usually do the job.

If you really want to upgrade it you have to go all the way and I can't really be bothered with that. But most of the drop-in "upgrades" (is pinball pro still in business?) don't really accomplish much.

My Robocop already sounds amazing so why mess with it!

Don't blame others for you trying to turn your game into something it isn't. You've got mod fever, baby, and the only cure is spending a bunch of money for very little benefit.

At the end of the day it's still just a commercial pinball machine. Most of us are happy with that.