I have the 1000/1 hooked up to 13w7. Well I think this is normal, but its annoying. After about 20min bumping it, the sub doesnt seem like its hitting that hard anymore. Is the amp like getting hot so it only produces some power to the sub? I got a mustang convertible and the trunk is small. Should I get cooling fans? I want to bump it for a long time. Its so annoying, but the lyrics is loud and fine and dont turn off.