My only concern with my Rumble 100 is that the speaker seems...what's the word?..."papery?" Like maybe it isn't very robust? Maybe it is, I dunno. But it has a sound on attack as if it flaps, or something. Not because I'm overdriving it, though, I'm not. Really. Thought maybe I was hearing my nails, but no, it does it with the side of my thumb, too. I hope it's not a lemon. Perhaps I'll go back to the store and play a different one and see how it sounds. I will also check in the headphones to see if it's a function of the amp (just thought of that). It's not my bass, the Markbass doesn't do it. My Bassman 150 doesn't either.