Hey, all. I'm finally finishing up converting a 1936 Silvertone floor radio into a kinda-cheating "amp" of an Ibanez TSA15H head + new baffle + new speaker cloth + new speaker. Long hiatus on this project, but eager to finish it now that I've finally carved out time to do so. The TSA offers very full, sweet cleans (if you keep its treble low). And the WGS G10C/S sounds lovely, even though it's stiffishly new--except if/until I play an open low E note, or a low F, or a low G. Then it really flubs out. It's not natural overdrive (and I didn't have the Tubescreamer on, which is a very different sound, anyway). It's genuine flub. Definition collapses into buzzy mush. Doesn't sound like over-driven tubes, as the amp visibly vibrates differently--more at its outer rings--when this occurs. This is volume dependent, starting at about 10 o'clock on the Volume knob. Very apparent at the head's 5W setting, worse at its 15W, and worse yet if the boost is also engaged. The amp isn't all that loud when it begins, so it's not like I'm really pushing things to generate the problem. FWIW, I was using a Jazzmaster to test things, and had the speaker both on its back on a thick book set on the hardwood floor, and on its side (propped up tightly). Same results, and no, it wasn't at all the floor or anything else vibrating. And my Jazzmaster doesn't flub out any other speaker I've used it with. So what gives? Will the flub resolve as the speaker breaks in--but isn't that supposed to work the other way, with weary rather than new speakers being the ones prone to flub? Or will the flub disappear once the speaker is mounted in the baffle and the baffle mounted into the radio's body (the physics of that, BTW, would escape me)? Dummy that I am, I don't have/know where I put the invoice for this speaker, and I bought it maybe two years ago, too. So am I stuck w/ a lemon here?