SOLVED: Room boom

I’ve used vibration pads similar to those referenced by the OP and they can be quite effective.  However, one should be warned that sustained contact with finished wood floors will result in marks that are difficult to remove.  I recommend that one apply a thin adhesive felt pad to prevent this.

Great to hear you found something that worked for you.

I had the same issue with my KEF Reference 5’s on my oak, tongue and groove floor. I bought some Isoacoustics Gaia ones and they helped a lot, but I still had some issues.  I went to a company that makes granite countertops and had them cut a couple of pieces to a size that fit under the KEF’s and it solved 99% of the vibrations. 
 

It's interesting.  Going from an old entertainment center to a solid component rack made an obvious audible improvement!.

You can get those much cheaper on supplyhouse.com

I use Townshend Isolation Podia on the mains and Isoacoustics Gaias on the subs.

Very clean.