Hey guys, I've been playing the bass for a good few years now, but am totally not a gear/tech guy. I have an Ampeg SVT 3 Pro head and a Ampeg BSE-410HLF cab. I leave my equipment at my friend's house, where we practice, and one day he had some of his friends who were amateur musicians come over and play with our equipment, which I wasn't informed about. Anywho, my friend said the "bassist" had turned up the gain 75% up, and the master about 20% up, and when he tried to play his bass, a "weird" noise was made. =\ Anywho, ever since then, my rig hasn't had the same sound. A week after that happened, we had our first gig, and my rig just didn't seem to have as much "oomph" to it. I was trying to practice with it the other day, putting it on low, and the sound was like, really muddy and the tone was just, awful. It almost sounded like my bass wasn't tuned (but it was/is). I've used my 2 other basses on it; same awful sound. I've changed the cables, and get the same awful sound. I don't know anybody in town that plays bass, so I can't just borrow someone's amp/cab to test mine with. My settings on the amp are the same as I've always had them and liked. So my question is, what can I do to find out what the problem might be? Would bad tubes make it have an awful sound? How can I check if/which speakers are blown if that might be the problem? What can I do to figure out what the problem is?