Chosen Solution
I have an Alto TS115 power PA speaker. I tested the woofer and high frequency driver and they are fine. I took the amp plate out and inspected it visually under plenty of light and magnification and can’t see anything obviously wrong such as a swollen capacitor. How can I find information on how to troubleshoot this problem? Thanks.
Since you probably have two of those speakers, you can compare values. My guess is that one of your power lines is missing (positive or negative), so measuring the powersupply voltage would be my first try.
