Did I just fry the pre-amp?

Did I just fry the pre-amp?

Since the door that holds the battery in place broke on my USA SUB Sterling, I wanted to figure out how to replace it. When I figured out what type of battery box is used, I popped in the battery and called it a day. Now a few hours later I connected the bass to play a little, but I get no sound. I checked the battery and to my shock, I put it in the wrong way. Yes, this is possible with the SUB’s battery box. I flipped it in the right way, but still I get no sound. Only some very vauge…

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