Quoted from greywolf:
Sound System is a Polk Audio 10" Subwoofer plus two pedestal home theatre satellites. On full volume it will rattle the playfield glass. Due to the directional nature of the speakers, I have not had to crank the volume to obnoxiously loud levels at the expos.
I'm thinking this machine actually inspired me to get into the hobby. It had the best sound of any pin at the Pin Expo in Marin in the summer of 2012...