My subwoofers for my car are not working proberly when i turn them on with my stereo they give off sound but its not a clear beat liek it should be they worked just yesterday and now today they dont they give off a vibrating buzz sound. When i turn them down they do it more but if i turn it up more i cant hear it doing that cause then they sound liek there working ok but its just sounding not right if someone could help me i would greatly appresiate it thanks