I just got this cab. Had it for a day. Running it with a pf-350 and it was awesome until today I am now getting what sounds like a blown horn/tweeter. If I turn the horn off no rattle. Set it to 0 or -6 and it doesn't sound good. I haven't over driven it. Haven't gone over board with the settings. Trying to get the cloth front off but it won't budge. Feels like I'm gonna wreck something if I pry to hard. Any ideas?