If you haven't already pulled the trigger, I would hold off on the KAB until you have made sure mechanical/design solutions have been exhausted.
1) A slight variation on what Elizabeth is suggesting above, I would try a very heavy wood or concrete platform (as heavy as you think your rack can handle) between your table and your rack isolated from the rack by sorbothane dots or equivalent.
2) Similar to what cpk is suggesting above, I would run the numbers on the compliance match with your cartridge and the tone arm. This could accentuate problems with rumble. Switching cartridges to one that is more compatible may solve the problem.
Turntables are mechanical devices first, and I would look to mechanical solutions before trying electronic soluitions.
Finally, this is an interesting test of the capacity of the Kidsmets to reproduce low frequencies. In some ways, a "good" kind of problem to have if solution is ultimately at hand.
1) A slight variation on what Elizabeth is suggesting above, I would try a very heavy wood or concrete platform (as heavy as you think your rack can handle) between your table and your rack isolated from the rack by sorbothane dots or equivalent.
2) Similar to what cpk is suggesting above, I would run the numbers on the compliance match with your cartridge and the tone arm. This could accentuate problems with rumble. Switching cartridges to one that is more compatible may solve the problem.
Turntables are mechanical devices first, and I would look to mechanical solutions before trying electronic soluitions.
Finally, this is an interesting test of the capacity of the Kidsmets to reproduce low frequencies. In some ways, a "good" kind of problem to have if solution is ultimately at hand.