Rumble - turntable or background noise DG LP

It’s possible the rumble and flutter are being amplified from feedback. Especially with a sub, it can push out a lot of energy to excite resonances on your rack, plinth, tonearm, etc. If that’s the case, better isolation will help a ton. You can "easily" test if this is the problem - by listening through headphones (speakers off, subs off) and seeing if you enjoy much better signal-to-noise ratio.

I’ve heard inadequate isolation manifest as a rumble sound, and as a hum that sounds much like a ground loop. These types of feedback are particularly insidious because they can get to a point where they runaway (keep increasing), which is dangerous.

Also dangerous is woofer flapping (subsonic energy), ESPECIALLY on those KEF’s! Unlike per cones, those drivers cannot tolerate excursion at all past their limits (search for ample photo evidence of busted KEF drivers). Thankfully you’re protecting them with a sub (assuming you run a high-pass filter on the KEF’s - if not you need one or you run risk of breaking the drivers), but too much energy isn’t good for the sub either and it will contribute greatly to feedback into the table.

You can try a phono stage with a subsonic filter if your present one lacks it. 

Rumble filter is a good idea. The ones built into phono stages generally range from mild to "really mild" and often won't save you in situations like this. KAB's standalone rumble filter is much much stronger, and can help a lot. But the fact that OP can hear the noise means it's at least partly above 20Hz, which is above the range of these filters. 

Hello - all good information and thank you.

What I do not understand is why  it is more present with the DG and not on the other vinyl. It would seem to me that if it is sound and vibration causing a feedback through the turntable system it would be noticeable regardless of the vinyl being played. The 45's seem to have a very wide dynamic range. I also do not hear it when I play the Ortofon test record. The disturbance has to start somewhere. I am going to further isolate the TT. TT now sits on a 20x15x1.25 wooden cutting board which is on top of a 60x17 buffet style wooden piece. I use some small felt rounds to level.

@sbsail9 - not all vinyl is equal - for example

• I have several albums from the TACET label
• TACET goes to a lot of trouble with the recordig of the music - superb
  • but they fail with cutting the master
    • the grroves are too close together
  • when I play quiet passages I can faintly hear the sound from the cutting of the adjacent groove.
  • it happens with every TACET album I have.
  • it is extremely frustrating to have paid top dollar for an excellent recording, onlt to have the cutting process mess things up
• It does not happen with most other 150gm and 180gm pressings I have and I have never observed this with any of my standard weight pressings

I cannot say for certain that this is your problem, but since you are experiencing this with the DG I would suspect this to be the case.

On another topic - TT isolation is very important and the following approach is pretty easy and affordable to try/implement

1. get two cereamic tiles large enough for the TT to sit on
2. get some felt feet from the dollar store and apply them randomly to the bottom of one tile
3. Sit this tile on the rack/or shelf/or cabinet
4. get some Rubber drawer liner from the Dollar Store
5. cut to the size of the tile and lay on the first tile
6. place the second tile on the rubber
7. place the TT on top of this "Tile Sandwhich"

The felt feet does a pretty good jop of isolation, but the drawer liner does the rest and stops the two tiles from vibrating sympathetically with any airborne vibrations

The thicker the tiles the better - on my previous TT I used 10mm granite tiles

My current TT uses 8mm ceramic tiles and it working just fine sitting on top of a cabinet.

I have tried many approaches, including the cutting block, but I find this approach to work the best with the TT’s I have owned

Regards - Steve