What is the easiest way to rule out a blown speaker? I noticed a buzz when I was practicing today and want to rule out a blown speaker. I know the buzzing can be something in the room so I am not overly concerned yet. I took the grill off the front of the cab and looked closely with a flashlight at each speaker and did not find any visual indications. I also pushed ever so lightly on each speaker to look for a tear, I found nothing. There was a lot of dust and even a spider nest or two so I dusted off the speakers and thought I would check the screws that hold the speakers. It turns out that half of them things were loose bye about an eighth of a turn or so. So I tightened everything up and put the cab back together and will have to wait to test it because baby went to sleep. But if anyone has a surefire way to tell if a speaker is blown, please post it.