Just put a Pinball Pro speaker in my Firepower because the old one was shot. I can crank the volume to max and, while I don't get any distortion and the quality is good, it's not that loud. I cleaned the pot and the balance is properly adjusted.
This is my first pin with just one speaker. I emailed Pinball Pro and they told me that it takes more amp power to drive their speaker than the factory one. I know the amp isn't much bigger than a tip 102 transistor so, am I just expecting too much? Any of you guys with early Williams SS pins please chime in and let me know. If the amp is "tired" I'll just replace it. It's a five dollar part.