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There are several things that could indicate a bad ground, such as: The amp not working at all. Odd noises being made by the subwoofer. Fluctuating sound quality, such as not hitting certain notes very well. And also an odd popping noise coming from the subwoofers. I hope this helps!

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Q: Symptoms of a bad ground on a amp?
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Your amp cuts off when you hook it up to your subwoofers?

either your amp has a short..... or.... you have a bad ground


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