Hey guys, I have a carvin bx500 powering a carvin RL810. 2 months ago I thought I blew a speaker. There wasn't any obvious damage but the sound it made was a horrendous, a loud buzz/growl and when I took it out and pressed on the cone, as it moved, it sounded like a dirty volume knob on an old stereo, so I replaced it. Last week, another speaker did the same thing. So just because, I put in the old one I thought was blown and it sounded perfect. No buzzing, growling or anything. Then about an hour in to practice, it started doing the same thing. Does this sound like I'm blowing speakers or is there another issue I'm not seeing. I do downtune to drop B (B F# B E), my tone is fairly bright and gritty (just using the drive control on the amp, no extra pedals) and never have the amp above 3-4.