Thanks for the tip!
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I just had to bump this thread. I tried parts of the tweaks mentioned above and it really worked for my TT set-up. Im hoping it can help others as well.
I have a direct drive Concept 2QD TT with busted shock absorber feet and I replaced them with some unused rigid metal feet that were from my Studiotech cabinet. I put the whole set-up on my isolation platform (maple cutting board, 16" x 16" x 2.5") and I had accidentally hit the TT and heard the thumping noises. No matter the area I would tap on the 2QD the thumping could be heard through my speakers. I was worried about other feedback as well as my speaker is within close proximity of my 2QD.
I found this thread along with some others by forum member Johnnyb53 and I took a page from his playbook.
I purchased a pair of Staples brand Deluxe Gel Keyboard wrist rests as they are the thickest out of the bunch being sold there. They had the most gel padding as far as I could tell and are 20" long and 3" wide. I put 2 of them under my isolation platform. The gel side facing down touching the shelf and the gripping side was touching the isolation platform. I put the 2QD with its new feet on this set-up and tapped away and there were no thumps. Only when I tapped really close to the cartridge did I hear a thump. I think most of the feedback is now gone and Im relieved.
Trying to get this Concept 2QD up and running with no issues has been quite an annoying ordeal this past couple of days. It cost me $36 but I'm very happy now. The wrist rests I got were the most expensive and you could probably use different/cheaper ones but I didnt want to take a chance.
Thanks Johnnyb53 for this thread and other posts about isolating a TT. They helped me out a lot.