Turntable feedback rumble problems with new sub


I have a Technics 1200 M3D and KEF LS50s. No issues. I just added a REL T7i and have a runaway feedback rumble problem at high volume. I added Isonoe footers to the table which didn’t do much. Unfortunately the table and speakers sit on a big media cabinet from Design Within Reach which is not ideal.  Not sure what the right next move is.  More turntable isolation, put footers under the cabinet legs, new turntable, new furniture, or new house?
ronribbons
If you have Isonoe it should be fine even if there is 10 000 Watt speakers near. Do not screw Isonoe tightly to the Technics cabinet you will kill its spring effect. It must be like this.

Move your SUB somewhere (away from the turntable).


@ronribbons I used to have that problem. I placed a set of bearings beneath the equipment stand, allowing it to be coupled to the floor, but otherwise able to move from side to side a little bit. This solved the footfall thing.
I used Aurios Pro bearings https://www.musicdirect.com/vibration-control/aurios-pro-max-isolation-bearings-set-of-3But they are n/l/a. But you might be able to find something similar.
I like the Idea of using granite, I went to the stone cutters place and when they make an area for a sink they have to cut out a big square piece of granite and then toss it out! I was able to get a nice size piece for the top of my stereo rack, it works very well at dampening all vibrations and resonances.
Springs man.

If you'll look back and search discussions on tt isolation, there's plenty of info still valid today.