I got a Dayton 10" sub from Parts-Express a few years ago. This was their $99 special. The sub has worked great until now... In the middle of the night it start putting out a ton of base, not a hum. It was almost like a partially connected cable but very loud. I pulled the power and removed the speaker cable. When I turned it back on it still did the same thing. Any ideas? or is it time to get a new one If it is bad, do you have any recommendations for a replacement? I want to keep it under $200.