Hi, I'm not sure whether this is the right place for this query, but nonetheless, I'm thinking of getting a 2nd hand Frontman and went to check it out today. All was well until I hit the low end quite hard, and the sound began to distort really badly. I had a look to see if a cone was loose/damaged, but couldn't really find anything. Any ideas what might be causing this? I don't want to shell out for something that can't be fixed.

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