Turntable on cement floor

[guitarman50]

I have my Rega turntable kept on top of a cabinet that clearly has some vibration issues. When I tap the top of the cabinet next to the turntable while the needle is on the record, you can hear it through the tonearm. As an experiment I placed it beside the cabinet on the cement floor and the sound became alot clearer and the rumble I hear on the record was pretty much all gone.
Would I be able to improve the cabinet by placing a slab of cement under the turntable on the cabinet?

 

[Dr Tinear]

Frank Van Alstine used to recommend building a turntable pier out of cinder blocks if you were fortunate enough to have a listening room with a concrete floor. Many years ago I saw the one he built in his basement showroom and heard how well it kept vibration away from his turntable. I'm not at all sure that mass-loading a resonant cabinet would work as well, but it's cheap enough that you should give it a try. Just my $0.02.