Speaker 3 inch - 4 ohm tweeter 15 watts
3 inch diameter 4 ohm 15 watt tweeter speaker used in backboxes of Williams/Bally WPC system (1990 era) and other brand pinball machines.
Mounting holes are 3.5 inch on-center hole to hole.
Please note the actual part may be of an increased wattage rating and this is considered an upgrade. Additionally, mounting holes may need to be adjusted for your machine.