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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?

vonhelmholtz
wturkey's avatar
wturkey
768 posts
 

http://kabusa.com/frameset.htm?/m1200.htm
 

Lookup Technics overhang gauge. 

yoyoyaya's avatar
yoyoyaya
750 posts
 

The cause is not the motor unit of the Technics and the turntable is excellent value for money so not worth changing unless you are upgrading to something better - which will cost.

One thing to check is to see whether you get noise when you move the tonearm across the platter manually - with the amplifier set at your normal listening volume. I have come across situations where you can get grounding issues as the tonearm wiring twists as the arm moves across the arc of it's travel.

It's a rare enough occurrence but worth checking, along with the other checks suggested above.

lewm
13,071 posts
 

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.

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