Rumble - turntable or background noise DG LP

@knock1 the symptoms can still vary from record to record and is much less prevalent with precision main bearings. 

@mulveling makes some very important points which brings to mind the location of the sub and the KEFs in relation to the turntable and another thought about the tonearm set up and whether or not the op verified the tracking weight, excessive VTF could also be a factor.  Inexpensive phono stages as others have mentioned can be all or nothing but usually are deliberately rolled off starting at like a 100Hz or so at a few decibels per octave to protect the amplifier and the speakers its connected to just in this type of situation.  One of these or other factors must have been overlooked to experience "sub flutter or pulsing" as the op states which is being amplified by the subs internal amp.

Again,  "groove roar is actually rumble from the poorly machined bearings" would be heard on ALL albums played on this turntable. Is it that complicated?

@knock1 seems to me you haven't actually been there but if you say so.

Suggest you take a 'good' record and a 'bad' record to your local HiFi dealer.  Explain that you'd like to listen on a good turntable to see where the rumble might be coming from.  There is the chance of a turntable sale if it is not on the record!

Sometimes traffic noise makes its way into a recording, or even the sound of the air-conditioning at the recording venue.  Or it could be a bad batch of vinyl.

@richardbrand has a good suggestion. The OP should get their own system out of the equation if they think the records have an issue (and I have already commented the DG TOS reissue doesn't have that issue here). Play them on a known good system before putting it all on the pressings is not a bad idea.

I still say issues like these are often down to inadequate isolation more than anything.