It’s not inconceivable that your 1200G is defective. Have you got a stethoscope? If so, place it against the plinth and listen for a noise above background. Or borrow another 1200G if your dealer is local.
Inner 1/3 of All Records Deep Obtrusive Rumble
Using a New Technics 1200G/Hana ML. Everything perfect until the inner 1/3 of every record. Subs are present but blend well with the main speakers. The rumble shakes my sofa, so base sound reinforcement/standing waves kick in. Have some large base traps(4), but bass traps aren’t the answer. I think it is the turntable direct drive mechanism, but I’ve not seen this complaint about this Technics. Any suggestions? I would prefer to dump the turntable vs notch filter..but maybe my thinking is off base...and then I would need to know what turntable should I be looking for?